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42 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Trouble Shooting
CORRECTIVE ACTION
• Check and tighten all wiring connections per diagrams. Thermostat wires tagged
“W” and “G” must be connected together (unless special thermostats are used; if
so, see thermostat wiring diagram). See electrical connections.
• Replace motor.
• Check for 24V across H terminals on fan time delay switch. If 24V is present, jumper
terminals numbered 1 and 3. If motor runs, the fan switch is defective and must be
replaced. If 24V is not present, check wiring per diagrams.
P. Fan motor turns on and off while burner is operating.
POSSIBLE CAUSE(S)
• Fan switch heater element improperly wired.
• Defective fan switch.
• Motor overload protector cycling on and off.
• Motor not properly oiled.
CORRECTIVE ACTION
Be sure fan switch heater terminals are connected per diagrams.
Replace fan switch.
Check motor amps against motor name plate rating, check voltage, replace fan motor if
defective.
Refer to label on motor.
Q. Fan motor will not stop.
POSSIBLE CAUSE(S)
1. Improperly wired fan control.
2. Main burners not lighting while thermostat calls for heat.
3. Defective fan switch.
CORRECTIVE ACTION
• Check all wiring.
• Refer to H or N symptoms.
• Replace fan switch.
R. Not enough heat.
POSSIBLE CAUSE(S)
1. Incorrect gas input.
2. Heater undersized.