1.10.4 Troubleshooting the Thermostat
Turn the fryer on and
set the thermostat control knob to the maximum setting.
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| Does the | Yes | Is the | Yes | Thermostat is OK. |
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| thermostat properly | ||||
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| burner light? | ||||
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| calibrated? |
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| No |
| No |
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Probable cause is | Yes | Is 24VAC |
| Probable cause is |
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present at the gas |
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a failed gas valve. |
| a failed thermostat. |
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| valve? |
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No
While it is still hot, inspect the thermostat body for damage. Inspect leads for fraying, burning, breaks, and/or kinks. Replace thermostat if it is bent, dented, or cracked, or if leads are damaged.
Thermostat has |
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| No | |
failed. |
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Probable cause
is a break or short 
No in the wiring.
Allow the cooking oil/shortening to cool to at least 15 degrees below the thermostat setting.
Remove the leads from the terminal block and check continuity.
Is continuity
OK (resistance is
zero)?
Yes
Replace the leads
in the terminal
block.
Is resistance
of wire from terminal
block to gas valve
zero?
Thermostat and
Yes 
associated wiring are OK.