FGP55 SERIES GAS RETHERMALIZERS
CHAPTER 1: SERVICE PROCEDURES
1-28
1.8.1 General Troubleshooting (cont.)
PROBLEM
PROBABLE CAUSES
CORRECTIVE ACTION
A. Water solenoid defective.
A. Replace the defective solenoid valve.
B. Float switch stuck or defective.
B. Press the ON/OFF switch off. Clean
float switch and make sure that the
float switch is not bent and that the
float moves freely up and down. Then
press the ON/OFF switch on. Replace
if found to be found defective. Toggle
on the solenoid valve bypass switch
to bypass the upper float switch and
allow the unit to fill with water.
Unit won’t fill with
water.
C. Water supply turned off.
C. Check water supply valve. Use
bypass switch to fill.
A.
Pilot does not stay lit.
A.
Check high-limit switch. Switch
continuity should be "0". If not, high-
limit switch is defective. Replace
high-limit switch. Flame sensor
possibly out of alignment. Realign
flame sensor. Check flame sensor for
loose wires.
B.
Pilot stays lit, and the high-limit and
flame sensor is 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 temperature probe sensor
(while still in cookpot) for damage.
Replace if bent, dented or cracked.
Inspect leads for fraying, burning,
breaks and/or kinks. If found, remove
and replace temperature probe.
No burner flame.
E.
Continuity from ignition module
block to gas valve is not "0".
E.
Inspect wiring for breaks or shorts and
repair if necessary.
A.
Incoming gas supply pressures are not
within range [Natural- 6-14" W.C.
(1.49-3.49 kPa); Propane- 11-14"
W.C. (2.74-3.49 kPa)]
A.
Inspect gas supply to rethermalizer.
Repair and/or replace faulty
components (defective supply shut-off
valves, incorrect piping size, etc.)
Fluctuating or erratic
lighting of burner
flame.
B.
Air in gas supply lines (new
installation).
B.
Allow unit to cycle on and off for
approximately 30 minutes to force air
from gas manifold and lines.
