Initial Troubleshooting, 24Vac Frying Systems - Frymaster FMCFE Service & Parts Manual

MASTER JET CF SERIES ATMOSPHERIC GAS FRYERS

1.10.2 Initial Troubleshooting, 24VAC Frying Systems

PROBLEM
Burner won't ignite.
Light in ON/OFF switch
is not illuminated.
ON/OFF switch is on,
but the switch light is
not illuminated.
ON/OFF switch is on
and the switch light is
illuminated, but there is
no output to gas valve.
No burner flame.
CHAPTER 1: SERVICE PROCEDURES
PROBABLE CAUSES
A. ON/OFF switch is off.
A. No 24 VAC output from transformer.
A. Drain microswitch circuit (filter-
equipped units) is open.
B. 24VAC is present at ON/OFF switch,
but continuity of the switch in ON
position is not "0".
C. Continuity of thermostat is not "0"
(cooking oil/shortening temperature is
at least 15°F below thermostat
setting).
D. Gas valve is suspect.
A. Pilot does not stay lit (fryer is on and
thermopile output is approximately
400 millivolts.
B. Pilot does not stay lit (fryer is on and
thermopile output is not
approximately 400 millivolts.
C. Pilot stays lit, and the high-limit and
thermopile are known working, but
burners fail to light.
D. Gas valve is known to be good, but
there is not 24 VAC at the gas valve
terminals.
E. Continuity from terminal block to gas
valve thermostat wire is not "0".
A. Turn ON/OFF switch on.
A. Check 24VAC circuit. Replace
transformer if defective.
A. Ensure drain valve is fully closed and
microswitch is functioning. Replace
microswitch if defective.
B. On/Off switch is defective. Replace
switch with a known working switch.
C. Thermostat is defective. Replace with
a known working thermostat.
D. Go to "No burner flame".
A. Check high-limit switch. Switch
continuity should be "0". If not, high-
limit switch is defective. Replace high-
limit switch.
B. Inspect thermopile (units without
interface board) and replace if
defective.
C. Inspect gas valve and replace if
defective.
D. Inspect thermostat body (while still in
frypot) for damage. Remove and
replace thermostat if bent, dented or
cracked. Inspect leads for fraying,
burning, breaks and/or kinks. If found,
remove and replace thermostat.
Remove leads from terminal block,
allow oil to cool 15°F below thermostat
setting and check continuity. If
continuity is not "0", then thermostat
has failed. Replace thermostat.
E. Inspect wiring for breaks or shorts and
repair if necessary.
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CORRECTIVE ACTION