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Troubleshooting the 24 VAC Circuit: Standing Pilot (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
Continuity across drain safety switch(es) not equal to 0 • Failed or open drain safety switch.
24 VAC is not present at V1S (V1D and V2D on dual-vat units). • Failed interface board
• If 24 VAC is present all the way through to the high-limit, go to Troubleshooting the Gas Valve, Section 1.7.2.
1.7.2 Troubleshooting the Gas Valve
Before troubleshooting, verify that the gas main street valve is open and the fryer gasline cutoff valve is
open. Place the gas valve in the ON position.
PROBLEM PROBABLE CAUSES
Incoming gas pressure is too high or low. • Problem with gas supply
Pilot won’t remain lit, low millivolt output from thermopile. • Failed thermopile
Pilot won’t remain lit, good millivolt output from thermopile. • Failed gas valve
• Failed high-limit
• If 24 VAC is not present at the gas valve, go to Troubleshooting the 24 VAC Circuit, Section 1.7.1.
1.7.3 Troubleshooting the Thermostat
Check the calibration of the thermostat before troubleshooting, if possible.
PROBLEM PROBABLE CAUSES
The burner does not light when the thermostat is set to the maxi-
mum setting.
• Failed thermostat
• Failed wiring
• If 24 VAC is present at the gas valve, but the burner is not lighting, go to Troubleshooting the Gas Valve, Section 1.7.2.