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Problems you are likely to encounter can be grouped into seven broad categories:
1. Ignition failures
2. Improper burner functioning
3. Improper temperature control
4. Computer-related problems
5. Filtration problems
6. Leakage problems
7. Basket lift malfunctions
The probable causes of each category are discussed in the following sections. A series of Trouble-
shooting Guides (decision trees) is also included at the end of the chapter to assist in identifying
some of the more common problems.
1.9.1 Ignition Failures
Ignition failures occur when the 24VAC power supply to the gas valve is interrupted, when the gas
supply is interrupted, or when the pilot flame is extinguished.
Solid-state controllers indicate ignition failure by illuminating the heat light and trouble light simul-
taneously. All other controllers give no specific indication of an ignition failure.
There are three primary reasons for ignition failure, listed in order of probability:
1. Problems related to the gas and/or electrical power supplies.
2. Problems related to the electronic circuits.
3. Problems related to the gas valve.
PROBLEMS RELATED TO THE GAS AND/OR ELECTRICAL POWER SUPPLIES
The main indicators of this are that an entire battery of fryers fails to light and/or there are no indica-
tor lights illuminated on the fryer experiencing ignition failure. Verify that the quick disconnect
hose is properly connected, the fryer is plugged in, the main gas supply valve is open, and the circuit
breaker for the fryer electrical supply is not tripped.
PROBLEMS RELATED TO THE ELECTRONIC CIRCUITS
If gas and electrical power are being supplied to the fryer, the next most likely cause of ignition fail-
ure is a problem in the 24 VAC circuit of the pilot system. If the fryer is equipped with a Filter
Magic II filtration system, first verify that the drain valve is fully closed. (The valve is attached to a
microswitch that must be closed for power to reach the gas valve. Often, although the valve handle
appears to be in the closed position, the microswitch is still open.) If the valve is fully closed, or the
fryer does not have a filtration system, refer to the troubleshooting guides
TROUBLESHOOTING THE
24 VAC CIRCUIT.
PROBLEMS RELATED TO THE GAS VALVE
If the problem is not in the 24 VAC circuit of the pilot system, it is most likely in the gas valve itself,
but before replacing the gas valve refer to TROUBLESHOOTING THE GAS VALVE on page 1–32.