Invertek Optidrive Fault Codes

O-I: Output Over Current

What it means: Instantaneous overcurrent on the drive output: the current spiked far above the drive rating and the drive shut the output off.^{[1][2][3][4][5][6]}

Also on: Optidrive P2 (named Over current trip) and Optidrive Eco (named Instantaneous over current on drive output): same code and number

Likely causes

• Short circuit phase to phase or phase to earth in the motor or motor cable
• Excess or shock load, or a jammed or stalled machine
• Acceleration ramp too short or torque boost too high
• Wrong motor nameplate data, or autotune not done in vector mode
• Motor holding brake not releasing

First checks, in this order

1. Check the motor and motor cable for phase to phase and phase to earth shorts.
2. Disconnect the motor and enable the drive. If it still trips with the motor disconnected, the drive needs service.
3. Check the driven machine for a jam, blockage or stall.
4. Check the motor data against the nameplate (E3: P-07, P-08, P-09; P2 and Eco: P1-07, P1-08, P1-09).
5. Increase the acceleration time (E3: P-03; P2 and Eco: P1-03) and reduce the boost (E3: P-11; P2 and Eco: P1-11).
6. P2 in vector mode (P4-01 = 0 or 1): check the power factor in P4-05, make sure an autotune has passed, and if it trips while running reduce the speed loop gain P4-03 (Eco: P4-03 and P4-04).
7. Wait out the reset delay (2 s after the first trip, up to 64 s after repeats) before you reset.

h O-I: Output Over Current

What it means: Fast hardware overcurrent trip on the drive output, most often caused by a short in the motor or motor cable.^{[1][2][3][4][5]}

Also on: Optidrive P2 and Optidrive Eco (named Instantaneous over current on drive output): same code and number. The E3 Fire Mode section calls it Fast Over-current Trip.

Likely causes

• Short circuit in the motor or motor cable
• Earth fault on the output side
• Same load and setup causes as O-I

First checks, in this order

1. Check the motor and connection cable for short circuits, phase to phase and phase to earth.
2. Work through the O-I checks (load, ramp, boost, motor data).
3. Wait out the reset delay (2 s after the first trip, up to 64 s after repeats) before you reset.

I.t-trP: Motor Thermal Overload (I2t)

What it means: Motor overload: the drive delivered more than 100% of the motor rated current (P-08) for too long, for example 150% for 60 seconds on the E3, and tripped to protect the motor.^{[1][2][3][4][5][6]}

Also on: Optidrive P2 and Optidrive Eco: same code and number, described as tripped on overload after delivering more than 100% of P1-08 for a period of time

Likely causes

• Motor overloaded or the machine is jammed or binding
• Motor rated current set wrong (E3: P-08; P2 and Eco: P1-08)
• Acceleration too fast for the load
• Motor cable longer than the drive allows
• Autotune not done in vector mode

First checks, in this order

1. Watch the display: flashing decimal points mean the drive is in overload. If they flash, increase the acceleration time or reduce the load.
2. Check that the motor rated current matches the nameplate (E3: P-08; P2 and Eco: P1-08), and also P1-07 and P1-09 on the P2 and Eco.
3. Check that the motor cable length is within the drive limit.
4. Check the machine turns freely with no jam or blockage.
5. On a fan or pump, a small reduction in speed can cut the load a lot.
6. E3 only: P-60 Index 2 = 1 makes the drive reduce its current limit instead of tripping.

O-Volt: Over voltage on DC bus

What it means: The internal DC bus voltage went too high, usually from energy the motor sends back while the load slows down.^{[1][2][3][4][5][6]}

Also on: Optidrive P2 and Optidrive Eco: same code, number and name

Likely causes

• Deceleration ramp too short for a high inertia load
• Overhauling load driving the motor
• Supply voltage above the drive tolerance
• Brake resistor not fitted, or the brake chopper not enabled

First checks, in this order

1. Measure the supply voltage and check it is within the drive tolerance.
2. Read the DC bus voltage (E3: P00-08, log of the last 8 values in P00-15; P2 and Eco: P0-20, log in P0-36).
3. If it trips while stopping, increase the deceleration time (E3: P-04; P2 and Eco: P1-04).
4. Fit a suitable brake resistor (E3 and P2) and on the E3 enable the brake chopper in P-34 (not available on Size 1).
5. P2 in vector mode: reduce the speed loop gain P4-03. P2 and Eco in PID control: make sure ramps are active by reducing P3-11.

U-Volt: Under voltage on DC bus

What it means: The DC bus voltage is too low. This shows routinely when power is switched off; it only points to a problem if it happens while running.^{[1][2][3][4][5][6]}

Also on: Optidrive P2 and Optidrive Eco: same code, number and name

Likely causes

• Normal power down
• Low incoming supply voltage
• Blown fuse, loose connection or faulty contactor in the supply line

First checks, in this order

1. If it appeared at power off, simply reset it.
2. If it trips while running, measure the incoming supply voltage.
3. Check all components in the supply feed: fuses, contactors, terminals.
4. Read the DC bus voltage (E3: P00-08; P2 and Eco: P0-20).

P-Loss: Input phase loss trip

What it means: One input phase of a 3 phase supply is missing or has low voltage.^{[1][2][3][4][5][6][7]}

Also on: Optidrive P2 (named Input phase loss) and Optidrive Eco (named Input phase missing trip): same code and number

Likely causes

• Blown fuse or open breaker pole on one phase
• Loose supply terminal
• Unbalanced supply phases
• A phase that sags under load because of a poor connection upstream

First checks, in this order

1. Check that the supply terminals are tight to the specified torque.
2. Measure each phase voltage and compare it with the drive operating range.
3. Check that the three phases are balanced.
4. Measure the phases under load: a phase that drops points to a poor connection in the supply line.

O-t: Heatsink over temperature

What it means: The drive heatsink is too hot.^{[1][2][3][4][5][6]}

Also on: Optidrive P2 and Optidrive Eco: same code, number and name

Likely causes

• Ambient temperature too high
• Blocked cooling air path or not enough clearance around the drive
• Internal cooling fan not running
• High switching frequency or heavy load

First checks, in this order

1. Check the ambient temperature around the drive against its specification.
2. Make sure cooling air can circulate and the mounting clearances in the user guide are kept.
3. Check that the internal cooling fan runs.
4. Read the heatsink temperature (E3: P00-09, log in P00-16; P2 and Eco: P0-21, log in P0-38).
5. Reduce the switching frequency (E3: P-17; P2 and Eco: P2-24) or reduce the load.

E-trip: External trip

What it means: An external trip was requested on the control terminals: on the E3, the normally closed contact on digital input 3 has opened.^{[1][2][3][4][5]}

Also on: Optidrive P2 (External trip) and Optidrive Eco (Digital Input External trip): same code and number

Likely causes

• External safety or process device has opened its contact
• Broken wire or loose terminal on the E-trip input
• Motor thermistor on that input reports the motor too hot

First checks, in this order

1. Check the external device wired to the E-trip input and its contact.
2. Check the wiring and terminal on digital input 3 (E3).
3. Check which input setting assigns E-trip (E3: P-15; P2 and Eco: P1-13).
4. If a motor thermistor is connected, check whether the motor is too hot.

OUt-F: Output Fault

What it means: Fault on the drive output, such as one motor phase missing or the motor phase currents out of balance.^{[1][2][3][4][5]}

Also on: Optidrive P2 and Optidrive Eco (named Drive output fault): same code and number

Likely causes

• Loose or open motor cable at the drive, the motor or a terminal in between
• Open motor winding
• Output stage fault in the drive

First checks, in this order

1. Check the motor and its connections.
2. Check for loose motor cables at the drive, at the motor and at any isolator or terminal box in between.
3. If the motor side checks out, contact your Invertek distributor.

PS-trP: Power stage trip

What it means: Hardware overcurrent in the power stage, usually from a short on the output side.^[2][4][5]

Also on: Optidrive P2 (named Hardware Over Current) and Optidrive Eco (named Instantaneous over current on drive output): same code and number

Likely causes

• Short circuit phase to phase or phase to earth in the motor or motor cable
• Failed output stage in the drive

First checks, in this order

1. Check the motor and connection cable for short circuits.
2. Disconnect the motor and motor cable and retest.
3. If the drive still trips with the motor disconnected, replace the drive and check the whole system before fitting the new one.

OL-br: Brake resistor overload

What it means: The drive software calculated that the brake resistor is overloaded and tripped to protect it.^[1][2][3][4]

Also on: Optidrive P2: same code, number and name

Likely causes

• Deceleration too fast for the resistor rating
• High load inertia or frequent stops
• Resistor too small for the duty

First checks, in this order

1. Increase the deceleration time.
2. Reduce the load inertia, or add brake resistors in parallel while keeping above the minimum resistance for the drive.
3. E3: check P-34. Settings 1 and 3 apply software protection sized for a 200 W continuous resistor.

OI-b: Brake channel over current

What it means: Overcurrent in the brake chopper circuit.^[1][2][3][4]

Also on: Optidrive P2: same code, number and name

Likely causes

• Short circuit in the brake resistor or its wiring
• Brake resistor value below the minimum for the drive

First checks, in this order

1. Check the external brake resistor condition and its wiring for shorts.
2. Check that the resistor value is above the minimum allowed for the drive (see the ratings tables in the user guide).

FLt-dc: DC bus ripple too high

What it means: The ripple voltage on the internal DC bus is too high, usually from a missing or unbalanced supply phase.^{[1][2][3][4][5]}

Also on: Optidrive P2 (Excessive DC ripple) and Optidrive Eco (Excessive DC Ripple on Internal DC bus): same code and number

Likely causes

• Supply phase missing or unbalanced
• Heavy motor load on a weak supply

First checks, in this order

1. Check that all three supply phases are present and balanced (P2 and Eco: within 3% voltage imbalance).
2. Read the DC bus ripple (E3: P00-06, log in P00-18; P2 and Eco: P0-16, log in P0-37).
3. Reduce the motor load.
4. If it persists, contact your Invertek distributor.

4-20 F: 4-20mA Signal Lost

What it means: The 4 to 20 mA reference on an analog input dropped below 3 mA; the drive trips 500 ms later.^{[1][2][3][4][5]}

Also on: Optidrive P2 and Optidrive Eco: same code, number and name (analog input 1 or 2, terminals 6 or 10)

Likely causes

• Broken or loose analog signal wire
• Signal source (sensor, PLC output) failed or off
• Input set to 4 to 20 mA while the source sends 0 to 10 V or 0 to 20 mA

First checks, in this order

1. Check the analog input wiring and the signal source.
2. Check the input format (E3: P-16 for analog input 1, P-47 for analog input 2).
3. E3: to run at Preset Speed 1 (P-20) instead of tripping on signal loss, choose the r 4-20 format.

F-Ptc: Motor PTC thermistor trip

What it means: The motor PTC thermistor connected to the drive reports the motor too hot.^{[1][2][3][4][5]}

Also on: Optidrive P2 and Optidrive Eco (named Motor PTC Over Temperature): same code and number

Likely causes

• Motor overheated from load, poor cooling or a blocked fan
• Thermistor wiring open or loose

First checks, in this order

1. Check the motor temperature, load and cooling.
2. Check the thermistor wiring and connections.
3. E3: the input must be set for a thermistor (P-47) with a P-15 setting that makes input 3 E-trip. Trip level is 2.5 kohm, reset at 2 kohm.
4. Eco: analog input 2 must be configured for the PTC device.

O-hEAt: Drive internal temperature too high

What it means: The temperature inside or around the drive is above its operating limit.^{[1][2][3][4][5]}

Also on: Optidrive P2 (Ambient Temperature High) and Optidrive Eco (Ambient Temperature too High): same code and number

Likely causes

• Hot enclosure or high ambient temperature
• Not enough cooling air or clearance
• Internal fan not running

First checks, in this order

1. Make sure enough cooling air reaches the drive and the mounting clearances are kept.
2. Check that the internal cooling fan runs.
3. Read the internal temperature (E3: P00-20, log in P00-19).
4. Reduce the switching frequency (E3: P-17; P2 and Eco: P2-24) or reduce the load.

U-t: Under temperature

What it means: The drive is too cold to run: the trip occurs when the ambient temperature is below -10 °C.^{[1][2][3][4][5][6]}

Also on: Optidrive P2 (Under temperature) and Optidrive Eco (Drive Under temperature): same code and number

Likely causes

• Cold enclosure or outdoor installation in winter

First checks, in this order

1. Raise the temperature around the drive above -10 °C, for example with an enclosure heater.
2. Read the heatsink temperature (E3: P00-09; P2 and Eco: P0-21) before restarting.

SC-Obs: Optibus comms loss

What it means: Communication was lost between the drive and an external device on its Optibus link, such as a remote keypad, a PC or another drive in master and slave mode.^{[1][2][3][4][5]}

Also on: Optidrive P2 and Optidrive Eco (named Communications Fault, comms lost with a PC or remote keypad): same code and number

Likely causes

• Loose or damaged comms cable
• Two drives on the network with the same address
• Remote keypad or PC disconnected

First checks, in this order

1. Check the communication link and cables between the drive and the external devices.
2. Make sure each drive on the network has its own unique address (E3: P-36 Index 1).
3. E3: check the watchdog timeout in P-36 Index 3.

SC-trp: Communications Loss Trip

What it means: Communications loss trip. The E3 user guides name it in the Fire Mode section, and the Invertek troubleshooting document lists it for all Optidrive ranges; the current E3 fault table shows comms loss as SC-Obs (12), SC-F01 (50) or SC-F02 (51).^[1][2][3][6]

Also on: Older Optidrive ranges: listed for all products in the Invertek troubleshooting document

Likely causes

• Comms link to an external device lost
• Duplicate drive address on the network

First checks, in this order

1. Check the communication link between the drive and the external devices.
2. Make sure each drive on the network has a unique address.
3. E3: check the watchdog timeout in P-36 Index 3.
4. If it persists, reset the drive to factory defaults and set it up again; if it still trips, send it to Invertek service.

Ph-Ib: Phase Imbalance

What it means: Phase imbalance trip on the incoming supply. The E3 user guides name it in the Fire Mode section without a fault number.^[1][2][3][6]

Also on: ODP and ODV drives (older Optidrive ranges) in the Invertek troubleshooting document, named Phase imbalance trip

Likely causes

• Supply phase voltages unequal
• Loose supply terminal or failing fuse on one phase

First checks, in this order

1. Measure each supply phase with a multimeter and check it is within the drive specification.
2. Check the supply terminals and fuses on every phase.
3. On ODP and ODV drives, compare your readings with the drive readings in P0-22, P0-23 and P0-24 (within 10%).
4. Make sure the drive firmware is the current production version; if the supply is good and the trip stays, send the drive to Invertek service.

SC-F01: Modbus comms loss fault

What it means: The drive has not received a valid Modbus RTU telegram within its watchdog time.^{[1][2][3][4][5]}

Also on: Optidrive P2 (Modbus Comms fault) and Optidrive Eco (Built-in Modbus RTU communication timeout or Communication Option Module Fault): same code and number

Likely causes

• Modbus RTU cable broken or loose
• Master or PLC stopped polling the drive
• Watchdog time set shorter than the polling cycle

First checks, in this order

1. Check the Modbus RTU connection cable.
2. Check that the master or PLC is running and polls at least one register cyclically.
3. Check the timeout (E3: P-36 Index 3; P2 and Eco: P5-05) and increase it to a suitable level.
4. Eco: this code also covers loss of internal comms with a fitted communication option module, so check the module is seated correctly.

SC-F02: CAN comms loss trip

What it means: The drive has not received valid CAN (CANopen) communication within the timeout.^[1][2][3][4]

Also on: Optidrive P2 (named CAN Open comms trip): same code and number

Likely causes

• CAN cable broken or loose
• CAN master stopped sending cyclic messages

First checks, in this order

1. Check the incoming CAN connection cable.
2. Check that cyclic communication happens within the timeout (E3: P-36 Index 3).
3. P2: check the time limit the CAN network controller sets for the drive node address.

FAn-F: Cooling Fan Fault

What it means: The drive internal cooling fan has failed; on the E3 this trip applies to IP66 units.^{[1][2][3][4][5]}

Also on: Optidrive P2 and Optidrive Eco: same code, number and name

Likely causes

• Worn or seized fan
• Fan blocked by dirt or debris

First checks, in this order

1. Check the internal cooling fan and replace it if needed.
2. E3: P00-27 shows the total fan run time.

th-FLt: Faulty thermistor on heatsink

What it means: The drive's own heatsink temperature sensor reads a fault.^{[1][2][3][4][5][6]}

Also on: Optidrive P2 and Optidrive Eco: same code, number and name

Likely causes

• Failed heatsink thermistor inside the drive
• Ambient temperature far outside the drive range

First checks, in this order

1. Check the ambient temperature is within the drive specification.
2. Power down, wait the full discharge time, power up again and see if the trip clears.
3. Read the heatsink temperature (E3: P00-09; P2 and Eco: P0-21).
4. If it persists, contact your Invertek sales partner.

dAtA-F: Internal memory fault (IO)

What it means: Internal memory fault: parameters were not saved and defaults may have been reloaded.^{[1][2][3][4][5]}

Also on: Optidrive P2 and Optidrive Eco (named Internal memory fault): same code and number

Likely causes

• Internal memory error on the control (IO) side

First checks, in this order

1. Press the Stop key and try again.
2. Check the parameter settings, since defaults may have been reloaded.
3. If the fault comes back, contact your supplier or Invertek distributor.

dAtA-E: Internal memory fault (DSP)

What it means: Internal memory fault on the DSP side: parameters were not saved and factory defaults may have been reloaded.^{[1][2][3][4][5]}

Also on: Optidrive P2 and Optidrive Eco (named Internal memory fault): same code and number

Likely causes

• Internal memory error on the DSP (power stage processor) side

First checks, in this order

1. Press the Stop key and try again.
2. Check the parameter settings, since factory defaults may have been reloaded.
3. If the fault comes back, contact your supplier or Invertek distributor.

P-dEF: Factory Default parameters loaded

What it means: Factory default parameters have been loaded. This is a notice after a parameter reset, not a hardware fault.^{[1][2][3][4][5]}

Also on: Optidrive P2 and Optidrive Eco (named Factory Default parameters have been loaded): same code and number

Likely causes

• Someone reset the drive to factory defaults (E3: Up, Down and Stop held for more than 2 s)

First checks, in this order

1. Press the Stop key; the drive is then ready to be set up.
2. Re-enter the application settings (motor data, ramps, control mode) before running.

AtF-01: Autotune Failed

What it means: Autotune failed because the measured motor stator resistance differs between phases.^[2][4][5]

Also on: Optidrive P2 and Optidrive Eco: same code and number; the E3 IP66 Indoor guide names it Autotune Fault

Likely causes

• Loose or open connection in one motor phase
• Unbalanced motor windings

First checks, in this order

1. Check the motor is connected correctly and the cable has continuity on all three phases.
2. Measure the winding resistance phase to phase and check it is balanced.
3. Run the autotune again (E3: P-52).

AtF-02: Autotune Fault

What it means: Autotune failed because the measured motor stator resistance is too large.^{[1][2][3][4][5]}

Also on: Optidrive P2 and Optidrive Eco (Autotune Failed group): same code and number

Likely causes

• Poor connection or broken conductor in the motor cable
• Motor much smaller than the drive rating

First checks, in this order

1. Check the motor cable and connections for continuity.
2. Check that all three motor phases are present and balanced.
3. Check that the motor power rating suits the drive power rating.

AtF-03: Autotune Failed

What it means: Autotune failed because the measured motor inductance is too low.^[2][4][5]

Also on: Optidrive P2 and Optidrive Eco: same code and number; the E3 IP66 Indoor guide groups it under Autotune Fault

Likely causes

• Motor wiring fault
• Motor fault

First checks, in this order

1. Check the motor is connected correctly and is free from faults.
2. Run the autotune again after fixing the wiring.

AtF-04: Autotune Failed

What it means: Autotune failed because the measured motor inductance is too large.^[2][4][5]

Also on: Optidrive P2 and Optidrive Eco: same code and number; the E3 IP66 Indoor guide groups it under Autotune Fault

Likely causes

• Motor wiring fault
• Motor power rating does not suit the drive

First checks, in this order

1. Check the motor is connected correctly and is free from faults.
2. Check that the motor power rating suits the drive power rating.

AtF-05: Autotune Failed

What it means: Autotune failed because the measured motor parameters did not converge.^[2][4][5]

Also on: Optidrive P2 and Optidrive Eco: same code and number; the E3 IP66 Indoor guide groups it under Autotune Fault

Likely causes

• Motor wiring fault
• Motor power rating does not suit the drive

First checks, in this order

1. Check the motor is connected correctly and is free from faults.
2. Check that the motor power rating suits the drive power rating.
3. Re-enter the nameplate data and run the autotune again.

U-dEF: User Parameter Default

What it means: User parameter defaults have been loaded. This is a notice after a user reset, not a hardware fault.^[4][5]

Also on: Optidrive Eco (named User Parameter Defaults): same code and number

Likely causes

• Someone loaded the stored user defaults (Eco: three button default)

First checks, in this order

1. Press the Stop key.
2. Confirm the loaded user settings match the application before running.

O-torq: Maximum Torque Limit Exceeded

What it means: On the P2, the output torque went past the drive capacity or the torque trip threshold.^[4]

Likely causes

• Motor load too high
• Acceleration too fast

First checks, in this order

1. Reduce the motor load.
2. Increase the acceleration time (P1-03).

O-torq: Motor current above configured profile

What it means: On the Eco, the Current Monitoring Function saw motor current above the normal profile set for the application.^[5]

Likely causes

• Mechanical load has changed, jammed or stalled
• Blocked pump
• Restricted air path on a fan

First checks, in this order

1. Check whether the mechanical load has changed or is jammed or stalling.
2. Pump: check for a blockage.
3. Fan: check the airstream to and from the fan is not restricted.

U-torq: Output Torque Too Low

What it means: On the P2 with hoist brake control (P2-18 = 8), the torque built up before releasing the motor holding brake stayed below the preset threshold.^[4]

Likely causes

• Motor or cable fault on a hoist
• Hoist torque threshold set wrong

First checks, in this order

1. Check the motor and motor cable.
2. Check the hoist brake control settings (P2-18 = 8) and contact your Invertek sales partner for hoist setup help.

U-torq: Motor current below configured profile

What it means: On the Eco, the Current Monitoring Function saw motor current below the normal profile, which usually means the load has been lost.^[5]

Likely causes

• Broken belt or coupling
• Motor disconnected from the drive
• Pump running dry

First checks, in this order

1. Check for a mechanical break that removes the load, such as a broken belt.
2. Check the motor is still connected to the drive.

Sto-F: Internal STO circuit Error

What it means: The drive found a possible fault in its internal Safe Torque Off (STO) circuit. On the Eco it can also be set to trip when STO opens while running.^[4][5]

Also on: Optidrive Eco: same code and number

Likely causes

• Slowly ramping 24 V signal on the STO inputs
• Internal STO circuit fault
• Eco with P6-16 = 1: STO opened while the drive was running

First checks, in this order

1. Check that the STO supply switches cleanly, not with a slow ramp.
2. Cycle the power: an internal STO trip can only be reset by a power cycle.
3. Eco: check P6-16. With P6-16 = 1 the trip resets like any other trip.
4. If it persists, contact your Invertek sales partner.

OUt-Ph: Output Phase Loss

What it means: One of the motor output phases is not connected to the drive.^[4][5]

Also on: Optidrive Eco (named Output (Motor) Phase Loss): same code and number

Likely causes

• Loose or open motor cable conductor
• Open isolator contact between drive and motor
• Open motor winding

First checks, in this order

1. Check all three motor conductors at the drive, at the motor and at any isolator in between.
2. Measure the motor winding continuity phase to phase.

Ph-SEq: Incorrect Supply Phase Sequence

What it means: Frame Size 8 drives only: the incoming supply phase sequence is wrong.^[4][5]

Also on: Optidrive Eco (named L1-L2-L3 Phase sequence is incorrect): same code and number

Likely causes

• Supply phases connected in the wrong order

First checks, in this order

1. With power isolated, swap any two incoming supply phases.

SC-F03: Fieldbus communication fault

What it means: Communication on the external fieldbus network through the option module was lost during operation.^[4][5]

Also on: Optidrive Eco (named Fitted communication Module Fault): same code and number

Likely causes

• Fieldbus cable or connector problem
• Network master or PLC stopped
• Timeout set too short

First checks, in this order

1. Check the network connection and cables.
2. Check the network master or PLC is running and sends valid telegrams cyclically.
3. Check the timeout in P5-05, or the one set by the fieldbus master, and increase it if needed.

SC-F04: IO card comms trip

What it means: Internal communication with the plugged in I/O option module was lost.^[4][5]

Also on: Optidrive Eco: same code, number and name

Likely causes

• Option module not fully seated
• Faulty option module

First checks, in this order

1. With power isolated, check that the option module is inserted correctly.
2. Replace the module if the trip stays.

SC-F05: BACnet comms loss trip

What it means: On the Eco, a valid BACnet telegram was not received within the watchdog time.^[5]

Likely causes

• BACnet cable or connector problem
• Building controller stopped
• Watchdog time too short

First checks, in this order

1. Check the network master or controller is running.
2. Check the connection cables.
3. Increase the watchdog time in P5-05 to a suitable level.

Pr-Lo: Low Pressure Detected by Pipe Fill Function

What it means: On the Eco, the pipe fill function saw system pressure stay too low.^[5]

Likely causes

• Leak or burst pipe
• Pipe fill function not set up correctly

First checks, in this order

1. Check the pump system for leaks or burst pipes.
2. Check the pipe fill settings P3-16 and P3-17.

Enc-01: Encoder Feedback Fault

What it means: On the P2, communication or data from the encoder was lost.^[4]

Likely causes

• Encoder cable broken or loose
• Encoder or encoder module fault

First checks, in this order

1. Check the encoder cable and connections.
2. Check the encoder option module is seated correctly.

SP-Err: Speed Error

What it means: On the P2, the gap between the measured (encoder) or estimated motor speed and the intended speed went past the limit in P6-07. In hoist mode this check is always active, even without an encoder.^[4]

Likely causes

• Load too heavy or slipping
• Encoder fault or wrong encoder setup
• Speed error limit P6-07 set too tight

First checks, in this order

1. Check the load and mechanics for slipping or overload.
2. Check the encoder wiring and the PPR setting in P6-06.
3. Check the limit in P6-07.

Enc-03: Encoder Feedback Fault

What it means: On the P2, the encoder pulses per revolution (PPR) count set in P6-06 is wrong.^[4]

Likely causes

• P6-06 does not match the encoder nameplate

First checks, in this order

1. Set P6-06 to the PPR on the encoder nameplate.

Enc-04: Encoder Feedback Fault

What it means: On the P2, encoder channel A has a fault.^[4]

Likely causes

• Channel A wire broken or loose
• Encoder fault

First checks, in this order

1. Check the channel A wiring and terminal.
2. Check the encoder supply and the encoder itself.

Enc-05: Encoder Feedback Fault

What it means: On the P2, encoder channel B has a fault.^[4]

Likely causes

• Channel B wire broken or loose
• Encoder fault

First checks, in this order

1. Check the channel B wiring and terminal.
2. Check the encoder supply and the encoder itself.

Enc-06: Encoder Feedback Fault

What it means: On the P2, both encoder channels A and B have a fault.^[4]

Likely causes

• Encoder cable disconnected or damaged
• Encoder supply missing
• Encoder failed

First checks, in this order

1. Check the encoder cable end to end and its connector.
2. Check the encoder supply voltage.
3. Check the encoder itself.