Moffat Blue Seal, Service Manual

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4 Fault Finding
12
Fault Possible Causes Remedy
Pilot flame small. Gas pressure too low.
Pilot adjustment screw out of adjustment.
Pilot injector restricted.
Check gas supply pressure.
(Refer Section 1 Specifications).
Adjust pilot adjustment screw.
(Refer Section 6.2.2).
Clean pilot injector.
(Refer Service Section 6.1.5).
Some of Main burners will not light. Incorrect supply pressure.
Wrong size or blocked Main Injectors.
Faulty Thermopile.
(Refer Fault Diagnosis 4.2.2 Thermopile
Faulty).
Faulty Thermostat.
(Refer Fault Diagnosis 4.2.2 Thermostat
Faulty).
Faulty Gas Control Valve.
(Refer Fault Diagnosis 4.2.2 Gas Control
Valve Faulty).
Check gas supply pressure.
(Refer Section 1 Specifications).
Replace / clean Main Injectors.
(Refer Section 6.1.2).
Replace Thermopile.
(Refer Section 6.1.8).
Replace Thermostat Switch.
(Refer Section 6.1.9).
Replace Gas Control Valve.
(Refer Section 6.1.4).
Main Burners do not burn
correctly. Incorrect supply pressure.
Blocked Main Injectors.
Incorrect Main Injector sizes.
Check gas supply pressure.
(Refer Section 1 Specifications).
(Refer Section 6.1.2).
Check Main Injector sizes and replace if
necessary.
(Refer Section 6.1.2 & Appendix A).
Set Temperature not reached. Gas supply fluctuating.
Thermopile faulty.
(Refer Fault Diagnosis 4.2.2 Thermopile
Faulty).
Small pilot flame.
(Refer Fault Diagnosis 4.2.1 Pilot Flame
too Small).
Thermostat out of calibration.
Placing food into oil too soon.
Too large a load
Check gas supply pressure.
(Refer Section 1 Specifications).
Replace Thermopile.
(Refer Section 6.1.8).
Check supply pressure. As Above.
Check for blocked Pilot Injector. Clean Pilot
Injector.
(Refer Section 6.1.5).
Check Pilot Injector size.
(Refer Appendix A).
Re-calibrate Thermostat.
(Refer Section 6.2.4).
Give the fryer more time to come up to
temperature before inserting food.
Reduced load size will allow the fryer to
recover temperature quicker.
Oil too hot. Thermostat out of calibration. Re-calibrate Thermostat.
(Refer Section 6.2.4).