Frymaster FilterQuick FQG30, Service Manual

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1-17
1. Gas and/or electrical power supplies
2. Electronic circuits
3. 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 indicator lights
illuminated on the fryer experiencing heating failure. Verify that the quick disconnect fitting is properly
connected, the fryer is plugged in with connector twisted and locked, 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 heating failure is a
problem in the 24 VAC circuit. Verify that the oil level sensor is working properly. Refer to Section 1.11.1,
TROUBLESHOOTING THE 24 VAC CIRCUIT .
Some typical causes of heating failure in this category include a defective sensing wire in the ignitor assembly,
a defective module, a defective ignition wire, and a defective ignitor.
Occasionally, a heating failure situation occurs in which all components appear to be serviceable and the
microamp reading is within specification, but the unit nevertheless goes into heating failure during operation.
The probable cause in this case is an intermittent failure of an ignition module. When the unit is opened up for
troubleshooting, the module cools down enough to operate correctly; however, when the unit is again closed up
and placed back into service the module heats up and fails
.
PROBLEMS RELATED TO THE GAS VALVE
If the problem is not in the 24 VAC circuit, it is most likely in the gas valve, itself. Before replacing the gas
valve, refer to Section 1.11.2
TROUBLESHOOTING THE GAS VALVE
.
1.10.2 Improper Burner Function
With problems in this category, the burner ignites but exhibits abnormal characteristics such as “popping,” dark
spots on the burner ceramics, fluctuating flame intensity, and flames shooting out of the flue.
“
Popping
” indicates delayed ignition. In this condition, the main gas valve is opening but the burner is not
immediately lighting. When ignition does take place, the excess gas “explodes” into flame, rather than
smoothly igniting.
The primary causes of popping are:

Incorrect or fluctuating gas pressure

Defective or incorrectly adjusted
combustion air blower

Inadequate make-up air

Heat-damaged controller or ignition
module

Cracked ignitor or broken ignition wire

Defective ignition module

Cracked burner tile (typically causes a very
loud pop).
If popping occurs only during peak operating hours, the problem may be incorrect or fluctuating gas pressure.
Verify that the incoming gas pressure (pressure to the gas valve) is in accordance with the appropriate CE or Non-CE
Standard found in Section 2.3 page 2-4 of the FilterQuick™ FQG30 Series Gas Fryer Installation and Operation
Manual (PN 819-7052), and that the pressure remains constant throughout all hours of usage. Refer to Section 1.7,
Checking the Burner Manifold Gas Pressure
in this manual for the procedure for checking the pressure of gas
supplied to the burner.