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1.7 Troubleshooting Guides
The following are only guides. They are provided to assist the technician or service professional in the
isolation of failures in components and wiring on the fryer.
1.7.1 Troubleshooting the 24 VAC Circuit
Troubleshooting the 24 VAC Circuit: Analog Controller
Before troubleshooting, verify that the drain valve(s) is fully closed and move the power switch into the
ON position.
PROBLEM PROBABLE CAUSES
24 VAC not present at gas valve or the power switch. • Failed 24 volt transformer
Continuity across the power switch not equal to 0. • Failed power switch
Continuity across the thermostat not equal to 0. • Failed thermostat
• If 24 VAC is present at the gas valve, go to Troubleshooting the Gas Valve, Section 1.7.2.
Troubleshooting the 24 VAC Circuit: Electronic Ignition (Computer Controller)
Before troubleshooting, verify that the drain valve is fully closed, then turn on the controller.
PROBLEM PROBABLE CAUSES
No LEDs on the interface board are lit. • Failed 24 volt transformer
• Failed interface board
• Failed or open drain safety switch
• Failed wiring between components
24 volt LED on the interface board is lit, no others. • Failed interface board
• Failed or open drain safety switch
• Failed wiring between components
GV LED on the interface board is lit (with or without other LEDs). • Failed interface board
• Open high-limit thermostat
• Failed or open drain safety switch
• Failed wiring between interface board
and gas valve
• Failed gas valve
LED 3 is continually lit, but LED 2 and LED 4 are not lit. • Failed heat relay
• Failed interface board
LEDs 2, 3, and 4 are lit, but 24 VAC is not present at V1S (V1D and
V2D on dual-vat units).
• Failed igition module
• Failed interface board
LEDs 2, 3, and 4 are lit, and 24 VAC is present at V1S (V1D and
V2D on dual-vat units).
• Failed interface board
• If a failed ignition module is suspected, replace the questionable module with one known to be good to isolate the problem.
• If 24 VAC is present on pin 6 on J1, but the pilot will not light, go to Troubleshooting the Gas Valve, Section 1.7.2.
• If 24 VAC is present on pin 20 of the 20-pin terminal block, but not at the gas valve, go to Troubleshooting the Gas Valve,
Section 1.7.2.