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TROUBLE SHOOTING CONTROL BOARD
To improve diagnosing and servicing, this control board is equipped with a self diagnosing
green status light (see wiring diagram). To indicate stand by mode and proper operation
this light will remain on. If there should be a malfunction, the light will flash a varying
number of times with a pause between each series of flashes. The number of flashes will
indicate the circuit to check.
# of Reason for Indication Possible Causes Corrective Action
Flashes
1 Failed ignition attempts Hot Surface Ignitor: Hot Surface Ignitor:
(3 times) a) Broken a) Replace
This puts heater into one hour b) Loose or damaged wire. b) Connect or replace wire
lockout mode. This one hour
lockout can be bypassed by
No Gas to Burner: No Gas to Burner:
resetting the thermostat. a) Valve in “OFF” position. a) Turn to “ON”
b) Gas supply turned OFF. b) Open gas supply valve.
c) Loose or damaged wire to valve. c) Connect or replace wire.
d) Defective or dirty flame sensor. d) Replace or clean sensor.
2 Pressure switch stuck closed Defective switch. Replace switch.
3 Pressure switch failed to close a) Vacuum hose disconnected or damged. a) Reconnect or replace vacuum hose.
b) Defective switch. b) Replace switch.
c) Wire disconnected or damaged. c) Connect or replace wire.
d) Obstruction in vent pipe. d) Remove obstruction.
4 Limit switch circuit open a) Defective limit switch. a) Replace limit switch.
b) Disconnected or damaged wire. b) Replace or connect wire.
5 Gas valve energized with no a) Defective gas valve. a) Replace gas valve.
call for heat b) Sensor defective. b) Replace sensor.
c) Short in sensor wire. c) Replace sensor wire.
6 Polarity reversal a) Hot and neutral electrical supply a) Unplug supply cord from wall
very wire reversed in junction box. socket. Open junction box and
rapid switch the hot and neutral wires.
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