COZY HEDV253A and, Инструкция по установке и эксплуатации

Страница: 22 / 73

1017952-A Page 21
TROUBLESHOOTING CHART
For use by a qualified service technician.
REASON FOR
INDICATION
# OF
FLASHES
POSSIBLE
CAUSES
CORRECTIVE ACTION
(To be performed by Contractor)
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.
System Lockout
Failed to Detect or
Sustain Flame
Pressure
Switch Open
or Closed
Limit Switch
Opens
Flame Sensed
Gas Valve
Not Energized
Internal Failure
(Control module failure and
power on self-check)
2
3
4
5
Steady
Light - No
Flashes
Normal Operation,
NO CALL FOR HEAT
Slow
Flash
Normal Operation,
CALL FOR HEAT
Fast
Flash
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.
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.