6-2
6.2 Troubleshooting Fryers
6.2.1 FQ4000 and Heating Problems
PROBLEM PROBABLE CAUSES CORRECTIVE ACTION
No display on the FQ4000.
A. No power to fryer.
B. Failed FQ4000 or another
component
A. Verify that the fryer is plugged in and that the
circuit breaker is not tripped.
B. Call your FAS for assistance.
FQ4000 displays HEATING
FAILURE.
Air in the lines; Gas valve off, failed
FQ4000, failed transformer, open high-
limit thermostat.
It is normal for this message to appear during startup
if the lines have air in them. Cycle the fryer on and off
a few times to purge the lines of air. Check that the
gas valve is on. If it continues, shut the fryer down and
call your FAS for assistance.
FQ4000 displays IS
VAT FULL? YES NO
during a cook or in idle
mode with an audible
alarm.
A. An error has occurred due to carbon
buildup on oil level float switch
sensor.
B. Normal operation during some
filtration functions.
C. If the display appears many times
during a filter it could be an
indication of slow oil return.
A. If answering yes directs to IS OIL SENSOR CLEAN?
CONFIRM, clean the oil level float switch with a
scratch pad and soft power cycle the FQ4000.
B. Ensure the vat is full of oil and press the √ button.
C. See section 6.2.3 troubleshooting –Filter Pump
runs, but oil return is very slow.
FQ4000 displays IS OIL
SENSOR CLEAN?
CONFIRM during a
cook or in idle mode
with an audible alarm.
A. The oil level float switch may be
coated with caramelized oil,
sediment or crumbs.
A. Clean oil level float switch with scratch pad
ensuring that it moves freely up and down.
FQ4000 displays CHANGE
FILTER PAPER?
Daily filter change prompt has occurred,
or filtration error has occurred.
Change the filter and ensure the filter pan has been
removed from the fryer for a minimum of 30 seconds.
Do NOT ignore CHANGE FILTER PAD prompts.
Fryer repeatedly cycles on
and off when first started.
Fryer is in melt cycle.
This is normal operation. This will continue until the
fryer temperature reaches 180ºF (82ºC).
Pilot will not ignite; no
evidence of gas at pilot
burner.
A. Gas valve is closed.
B. Pilot is blocked.
C. Burner contamination.
A. Check that gas valve is open and gas is present at
the gas valve. Ensure that any shut off valves
behind fryer are open.
B. Check pilot burner orifice for dirt or lint.
C. Contact your FAS for service.
Pilot burner ignites but
will not remain lit.
A. Improper pilot flame.
B. Connection issue.
A. Contact your FAS for service.
B. Contact your FAS for service.
Main burner will not come
"ON"; gas not detected at
main burner.
A. Gas valve is not turned on.
B. Pilot is not ignited.
C. Oil level float switch stuck down
D. High limit switch tripped.
E. High limit defective.
F. Gas valve defective.
A. Turn the gas valve knob to the ON position.
B. Check that the pilot is ignited and is operating
properly.
C. Ensure the oil level float switch is clean and moves
freely up and down the shaft.
D. Press high limit switch reset under control box.
E. Contact your FAS for service.
F. Contact your FAS for service.
Float switch in upper
position but no power to
main valve.
Relay or time delay relay in transformer
box is defective.
Contact your FAS for service.
Main burner flames are
small and appear lazy; oil
does not come up to
temperature quickly.
Improper gas pressure. Contact your FAS for service.
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