Troubleshooting The Thermostat - Frymaster 47 SERIES Installation, Operation, Service, And Parts Manual

7.10.6 Troubleshooting the Thermostat

Probable cause is failed Gas
Valve.
Probable cause is
break or short in wiring.
47 SERIES GAS FRYERS
CHAPTER 7: SERVICE PROCEDURES
Turn fryer on and set
Thermostat Control Knob to
maximum setting.
Does burner light?
No
Are there 24
Yes
VAC on the Gas Valve
terminal?
No
While it is still in frypot, inspect
Thermostat body for damage.
Remove and replace if bent,
dented, or cracked.
Inspect leads for fraying,
burning, breaks, and/or kinks.
If found, remove and replace
Thermostat.
Allow cooking oil/shortening
to cool to at least 15 degrees
below Thermostat setting.
Remove leads from
terminal block and check
continuity.
No
Is continuity "0"?
Yes
Replace leads in
Terminal Block.
Is continuity
of wire from Terminal
No
Block to Gas Valve
"0"?
7-36
Is
Yes
Thermostat properly
calibrated?
No
Probable cause is failed
Thermostat.
Thermostat has failed.
Yes
Thermostat is OK.
Yes
Thermostat is OK.