COZY HEDV253A Instalación E Instrucciones De Operación página 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
Normal Operation,
Slow
Flash NO CALL FOR HEAT
Fast Normal Operation,
Flash 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 Internal Failure
Light - No
(Control module failure and
Flashes
power on self-check)
TROUBLESHOOTING CHART
For use by a qualified service technician.
POSSIBLE
CAUSES
1. Defective ignitor.
2. Ignitor cable defective.
3. Ignitor cable disconnected.
4. Manual gas valve in "OFF"
position. No gas to valve.
5. Defective wire to gas valve.
6. Wire to gas valve disconnected.
7. Obstruction to vent outlet.
8. Obstruction to air inlet.
1. Defective pressure switch.
2. Pressure switch tubing damaged,
kinked or collapsed.
3. Pressure switch tubing
disconnected.
4. Defective draft inducer.
5. Pressure switch tubing to the
wrong connection.
1. Defective limit switch.
2. Damaged limit switch wire.
3. Limit switch wire disconnected.
4. Blockage in front of front panel.
5. Heater over rate.
1. Defective gas valve.
2. Defective control module.
1. Defective control module.
Page 21
CORRECTIVE ACTION
(To be performed by Contractor)
1. Replace ignitor.
2. Replace ignitor cable.
3. Connect ignitor cable.
4. Turn manual gas valve to "ON."
5. Replace defective wire.
6. Connect gas valve wire.
7. Remove obstruction.
8. Remove obstruction.
1. Replace pressure switch.
2. Replace damaged tubing.
3. Connect pressure switch tubing.
4. Replace draft inducer.
5 Reverse tubing connections on pressure switch.
1. Replace limit switch.
2. Replace damaged wire.
3. Connect limit switch wire.
4. Remove blockage.
5. Check orifice, pressures, rate.
1. Replace gas valve.
2. Replace control module.
1. Replace control module.
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1017952-A