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1.10.4 Troubleshooting the Thermostat
Turn the fryer on and
set the thermostat
control knob to the
maximum setting.
Does the
burner light?
Is the
thermostat properly
calibrated?
Thermostat is OK.Yes Yes
Is 24VAC
present at the gas
valve?
Probable cause is
a failed thermostat.
No
Probable cause is
a failed gas valve.
Yes
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.
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)?
Thermostat has
failed.
Replace the leads
in the terminal
block.
Is resistance
of wire from terminal
block to gas valve
zero?
No
Yes
No
Probable cause
is a break or short
in the wiring.
No
Thermostat and
associated wiring
are OK.
Yes
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