# OF REASON FOR
FLASHES INDICATION POSSIBLE CAUSES CORRECTIVE ACTION
Slow Flash Normal operation,
no call for heat
Fast Flash Normal operation,
call for heat
2 System lockout a.) Defective ignitor. a.) Replace ignitor.
failed to detect or b.) Ignition cable defective. b.) Replace ignitor cable.
sustain flame c.) Ignitor cable disconnected. c.) Connect ignitor cable.
d.) Manual gas valve in “OFF” d.) Turn manual gas valve to “ON”.
position. No gas to valve.
e.) Defective wire to gas valve. e.) Replace defective wire.
f.) Wire to gas valve disconnected. f.) Connect gas valve wire.
g.) Obstruction to vent outlet. g.) Remove obstruction.
h.) Obstruction to air inlet. h.) Remove obstruction.
3 Pressure switch a.) Defective pressure switch. a.) Replace pressure switch.
Open or Closed b.) Pressure switch tubing b.) Replace damaged tubing.
damaged, kinked or collapsed.
c.) Pressure switch tubing c.) Connect pressure switch tubing.
disconnected.
d.) Defective draft inducer. d.) Replace draft inducer.
e.) Pressure switch tubing to e.) Reverse tubing connections on
wrong connection. pressure switch.
4 Limit Switch opens a.) Defective limit switch. a.) Replace limit switch.
b.) Damaged limit switch wire. b.) Replace damaged wire.
c.) Limit switch wire disconnected. c.) Connect limit switch wire.
d.) Blockage in front of front panel.d.) Remove blockage.
e.) Heater over rate. e.) Check orifice, pressures, rate.
5 Flame sensed gas a.) Defective gas valve. a.) Replace gas valve.
valve not energized b.) Defective control module. b.) Replace control module.
Steady light Internal failure a.) Defective control module. a.) Replace control module.
No Flashes (control module
failure and power
on self-check)
TROUBLE SHOOTING CHARTTo assist in diagnosing and servicing, this heater is equipped with a self-diagnosing control module. Should amalfunction occur, the green indicator light on the control module will flash a varying number of times indicating thecircuit in which malfunction is located.Page 22