COZY HEDV254A Installation And Operating Instructions Manual page 19

TROUBLE SHOOTING CHART
To assist in diagnosing and servicing, this heater is equipped with a self-diagnosing con-
trol 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 CORRECTIVEACTION
FLASHES POSSIBLE CAUSES TO BE TAKEN BY CONTRACTOR
Slow Flash
Fast Flash
2
Steady light
No Flashes
REASON FOR
INDICATION
Nonna! operation,
no call for heat
Normal operation,
call t\_rheat
System lockout
t:ailed to detect or
sustain flame
Pressure switch
Open or Closed
Limit Switch opens
Flame sensed gas
valve not energized
Internal tiailure
(control module
t:ailure and power
on self-check)
a.) Detective ignitor.
b.) Ignitor cable detective.
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
g.) Obstruction to vent outlet.
h.) Obstruction to air inlet.
a.) Defective pressure switch.
b.) Pressure switch robing
damaged, kinked or collapsed.
c.) Pressure switch robing
disconnected.
d.) Detective draft inducer.
e.) Pressure switch tubing to
wrong connection.
a.) Defective limit switch.
b.) Damaged limit switch wire.
c.) Limit switchwire disconnected.
d.) Blockage in t}ont of front panel
e.) Heater overrate.
a.) Defective gas valve.
b.) Defective control module.
a.) Defective control module.
a.) Replace ignitor.
b.) Replace ignitor cable.
c.) Connect ignitor cable.
d.) Turn manual gas valve to "ON".
e.) Replace defective wire.
f.) Connect gas valve wire.
g.) Remove obstruction.
h.) Remove obstruction.
a.) Replace pressure switch.
b.) Replace damaged robing.
c.) Connect pressure switch tubing.
d.) Replace &aft inducer.
e.) Reverse tubing connections on
pressure switch.
a.) Replace limit switch.
b.) Replace damaged wire.
c.) Connect limit switch wire.
d.) Remove blockage.
e.) Check orifice, pressures, rate.
a.) Replace gas valve.
b.) Replace control module.
a.) Replace control module.
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