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MASTER JET CF SERIES ATMOSPHERIC GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-33
1.10.2 Initial Troubleshooting, 24VAC Frying Systems
PROBLEM PROBABLE CAUSES CORRECTIVE ACTION
Burner won’t ignite.
Light in ON/OFF switch
is not illuminated.
A. ON/OFF switch is off. A. Turn ON/OFF switch on.
ON/OFF switch is on,
but the switch light is
not illuminated.
A. No 24 VAC output from transformer. A. Check 24VAC circuit. Replace
transformer if defective.
A. Drain microswitch circuit (filter-
equipped units) is open.
A. Ensure drain valve is fully closed and
microswitch is functioning. Replace
microswitch if defective.
B. 24VAC is present at ON/OFF switch,
but continuity of the switch in ON
position is not "0".
B. On/Off switch is defective. Replace
switch with a known working switch.
C. Continuity of thermostat is not "0"
(cooking oil/shortening temperature is
at least 15°F below thermostat
setting).
C. Thermostat is defective. Replace with
a known working thermostat.
ON/OFF switch is on
and the switch light is
illuminated, but there is
no output to gas valve.
D. Gas valve is suspect. D. Go to "No burner flame".
A. Pilot does not stay lit (fryer is on and
thermopile output is approximately
400 millivolts.
A. Check high-limit switch. Switch
continuity should be "0". If not, high-
limit switch is defective. Replace high-
limit switch.
B. Pilot does not stay lit (fryer is on and
thermopile output is not
approximately 400 millivolts.
B. Inspect thermopile (units without
interface board) and replace if
defective.
C. Pilot stays lit, and the high-limit and
thermopile are known working, but
burners fail to light.
C. Inspect gas valve and replace if
defective.
D. Gas valve is known to be good, but
there is not 24 VAC at the gas valve
terminals.
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.
No burner flame.
E. Continuity from terminal block to gas
valve thermostat wire is not "0".
E. Inspect wiring for breaks or shorts and
repair if necessary.