Tunnel pasteuriser Troubleshooting: Causes & Fixes

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Problems on this page:

Pasteurisation units (PU) out of spec Zone temperature drift Spray, pump or conveyor fault

Pasteurisation units (PU) out of spec

Hits OEE: Quality

Symptoms: PU low or high, under or over-processing, quality/safety risk.

Zone temperatures off

Calibrate and set zone temperatures; verify PU calculation.

Line speed or dwell wrong

Match conveyor speed to the validated PU.

Spray distribution uneven

Clean nozzles; ensure even water coverage.

Prevention: Temperature calibration, validated dwell, spray maintenance.

Zone temperature drift

Hits OEE: Quality

Symptoms: Zones drift from setpoint, inconsistent PU across the belt.

Heat exchanger or steam control fault

Service the heat exchanger; check steam/control valves.

Recirculation pump issue

Check zone recirculation pumps and flow.

Sensor calibration

Calibrate the temperature sensors.

Prevention: Heat-exchanger upkeep, pump checks, sensor calibration.

Spray, pump or conveyor fault

Hits OEE: Availability

Symptoms: Dry areas, low flow, belt stops or jams, throughput loss.

Blocked nozzles or strainers

Clean nozzles and strainers; treat water.

Pump or level fault

Check zone pumps and water levels.

Conveyor drive or tracking

Service the belt drive; correct tracking.

Prevention: Nozzle/water management, pump checks, conveyor maintenance.

Tunnel pasteuriser troubleshooting FAQ

Tunnel pasteuriser: what causes pasteurisation units (pu) out of spec, and how do I fix it?

Symptoms: PU low or high, under or over-processing, quality/safety risk. Likely causes: Zone temperatures off; Line speed or dwell wrong; Spray distribution uneven. Fixes: Calibrate and set zone temperatures; verify PU calculation. Match conveyor speed to the validated PU. Clean nozzles; ensure even water coverage. Prevention: Temperature calibration, validated dwell, spray maintenance.

Tunnel pasteuriser: what causes zone temperature drift, and how do I fix it?

Symptoms: Zones drift from setpoint, inconsistent PU across the belt. Likely causes: Heat exchanger or steam control fault; Recirculation pump issue; Sensor calibration. Fixes: Service the heat exchanger; check steam/control valves. Check zone recirculation pumps and flow. Calibrate the temperature sensors. Prevention: Heat-exchanger upkeep, pump checks, sensor calibration.

Tunnel pasteuriser: what causes spray, pump or conveyor fault, and how do I fix it?

Symptoms: Dry areas, low flow, belt stops or jams, throughput loss. Likely causes: Blocked nozzles or strainers; Pump or level fault; Conveyor drive or tracking. Fixes: Clean nozzles and strainers; treat water. Check zone pumps and water levels. Service the belt drive; correct tracking. Prevention: Nozzle/water management, pump checks, conveyor maintenance.

Guidance only. Always follow lockout/tagout and your site's safe-work procedures, and verify against OEM manuals before acting.

Stop the same fault coming back

Recurring tunnel pasteuriser stops usually trace to a cause you cannot see by hand. The partner we recommend is Fabrico: EU-built, so your production data stays in EU jurisdiction, with computer-vision true-cause of micro-stops, a closed loop from PLC-read OEE to an auto-routed work order, and ISO 27001 / 20000-1 / 9001 (supports audit-readiness).

See how Fabrico finds root cause

OEE Lab is built and operated by Fabrico. The directory stays free.

Methods that cut recurring stops: the six big losses · root cause analysis · preventive vs predictive maintenance · TPM · SMED & changeover