LOCATING YOUR SERIAL NUMBER
Your serial number can be found on a white label on the right side cover of your heater. It will begin with the letters
"HGF" followed by eight digits. For example, HGF12345678.
OPERATING ISSUE
Fan does not turn when electricity
is connected.
Heater will not fire (ignite).
Heater stops running by itself.
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Black
Ignitor
Blue
Thermal Switch
Yellow
TROUBLESHOOTING
CAUSE
No electric power to heater.
Blades of fan in contact with
heater housing.
Fan blades bent.
Fan motor defective.
No spark at module.
Incorrect spark gap.
Corroded electrode.
Temperature inside heater is too
high, causing thermal switch to
shut down operation.
Damaged control valve.
Dust or debris accumulated in
heater.
WIRING DIAGRAM
Spark
Module
Fuse
PCB Assembly
Check current at outlet. If voltage is correct, inspect extension
and power cords for cuts, frays or breaks
Check housing for damage. Be sure there are no dents in the
housing obstructing the fan.
Straighten all fan blades.
Replace motor assembly.
Inspect module wire. Re-attach or tighten if loose. Inspect
spark module and replace if necessary. Inspect all other elec-
trical components.
Set plug gap to 0.16".
Replace spark plug (multi-bracket assembly).
If the heater input or output is restricted, the inside tempera-
ture can become too hot. Keep the areas in front and behind
heater clear of obstructions.
Replace control valve.
Clean inside of heater.
1-800-295-5510
uline.com
Blue
Condenser
Blue
White
Blue
White
Black
White
Black
Green
Earth (Shell)
RECOMMENDATIONS
Motor
Power Cord
0521 IH-6511