Troubleshooting The 24 Vac Circuit: Standing Pilot (Computer Controller); Troubleshooting The Gas Valve; Troubleshooting The Thermostat - Frymaster GASFRYERSMODELS 35 User Manual

Troubleshooting the 24 VAC Circuit: Standing Pilot (Computer Controller)

Before troubleshooting, verify that the drain valve is fully closed, then turn on the controller.
No LEDs on the interface board are lit.
24 volt LED on the interface board is lit, no others.
GV LED on the interface board is lit (with or without other LEDs).
Continuity across drain safety switch(es) not equal to 0
24 VAC is not present at V1S (V1D and V2D on dual-vat units).
• 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.
Incoming gas pressure is too high or low.
Pilot won't remain lit, low millivolt output from thermopile.
Pilot won't remain lit, good millivolt output from thermopile.
• 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.
The burner does not light when the thermostat is set to the maxi-
mum setting.
• 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.
PROBLEM
PROBLEM
PROBLEM
• Failed 24 volt transformer
• Failed interface board
• Failed or open drain safety switch
• Failed wiring between components
• Failed interface board
• Failed or open drain safety switch
• Failed wiring between components
• Failed interface board
• Open high-limit thermostat
• Failed or open drain safety switch
• Failed wiring between interface board
and gas valve
• Failed gas valve
• Failed or open drain safety switch.
• Failed interface board
• Problem with gas supply
• Failed thermopile
• Failed gas valve
• Failed high-limit
• Failed thermostat
• Failed wiring
1-25
PROBABLE CAUSES
PROBABLE CAUSES
PROBABLE CAUSES