Troubleshooting The Thermostat - Frymaster 45 Series Service And Parts Manual

1.10.4 Troubleshooting the Thermostat

Probable cause is
a failed gas valve.
Thermostat has
failed.
Probable cause
is a break or short
in the wiring.
Turn the fryer on and
set the thermostat
control knob to the
maximum setting.
Does the
burner light?
No
Is 24VAC
Yes present at the gas
valve?
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
No OK (resistance is
zero)?
Yes
Replace the leads
in the terminal
block.
Is resistance
of wire from terminal
No
block to gas valve
zero?
Is the
Yes thermostat properly
calibrated?
No
Probable cause is
a failed thermostat.
Thermostat and
Yes associated wiring
are OK.
1-34
Yes Thermostat is OK.