COZY WOW253 Installation And Operating Instructions Manual page 22

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