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Damper Sticks
Damper Rotates Continuously
CONDITION
No 120 VAC Between
White # 4 & Black # 1
No 120 VAC Between
White # 4 & Orange # 2
120 VAC Power Between
White # 4 & Black # 1
When Calling For Heat
120 VAC Power Between
White # 4 & Black # 1
120 VAC Between
White # 4 & Orange # 2
DAMPER OPEN
No 120 VAC Power
Between
White # 4 & Yellow # 3
Damper Open
No combustion
1. Something obstructing damper
blade.
2. Damper pipe egg shaped.
Out of round / binding.
3. Crimped end of vent pipe inserted
in too far.
1. Defective damper motor
assembly.
POSSIBLE CAUSE
1. Off on high or secondary limit
2. Loose or broken connections.
3. Check fuse or circuit breaker.
4. Disconnect or emergency switch
off
5. Wired wrong see diagrams
6. Check Blower Door Switch
1. Thermostat not calling for heat.
2. Loose or broken connections.
3. Off / On operating limit, pressure
control or low water cut off.
4. Wired wrong
1. Loose or broken connection.
2. Off on Manual Reset
WMO-1 Blocked Vent Safety
3. Remove WMO-1 cover
120 VAC should be present
between each switch terminal
and the green ground wire.
4. Blocked Vent or Chimney
5. Insufficient Combustion Air
6. Insufficient Make Up Air
7. Defective WMO-1
8. Defective Damper Motor
Assembly.
16
1. Make sure damper gate is free of
all obstructions.
2. Adjust damper pipe or replace
vent damper.
3. Properly align and secure vent
pipe making sure damper gate
will NOT touch vent pipe.
1. Replace damper motor assembly.
RECOMMENDED SOLUTION
1. Wait for limit to reset
2. Repair loose or broken connections
3. Replace fuse or reset circuit breaker
4. Turn on switch
5. Rewire according to diagram
6. Close blower door
1. Turn thermostat up to call for heat.
2. Replace thermostat
3. Tighten, repair or replace
connection.
4. Wait for the operating limit,
pressure control or lower water cut
off to close.
5. Revisit wiring diagrams
1. Repair or replace connection.
2. Manually reset WMO-1 safety
3. Check for Blocked or Insufficient
Vent or Chimney
4. Check for Adequate Combustion
Air
5. Check for Adequate Make Up Air
6. Replace WMO-1
7. Replace Damper Motor Assembly
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