IS356 ECN3592
14
TROUBLESHOOTING
FAULT FINDING
Explanation of the Control System
The gas circuit in this fryer is operated by two millivolt systems.
The first consists of an interrupted thermocouple, the pilot burner and the gas control.
Heat from the pilot flame acting on the thermocouple generates a 15-30 mV electrical potential.
This millivolt system connected to the gas control operates the first solenoid that allows gas to the pilot
burner. The over temperature stat is included in this system which operates via the interrupted thermocouple.
The first solenoid operates as the safety device which shuts down in the event of a thermocouple failure or if
the over temperature stat goes open circuit.
The secondary millivolt system consists of a thermopile acting through the gas control via the control
thermostat.
Heat from the pilot flame acting on the thermopile generates a 500-700 mV electrical potential.
This millivolt system connected to the gas control operates the secondary solenoid that passes gas to the main
burners.
The system is interrupted by the control thermostat as it cycles, thereby opening and closing the gas supply to
the main burners.
The following trouble shooting flow charts are designed to give assistance on the most probable cause of
failure of the gas circuit.
Use the step-by-step instructions to quickly pinpoint problems and the advice to help in taking the appropriate
action to rectify them.
Piezo Igniter not sparking.
Is there a short in the High Tension
Lead.
Replace Electrode.
Yes.
If no spark is generated at all,
replace Piezo Ignitor.
No.
Has Electrode Insulator Fractured.
No
Yes.
Replace Lead.
