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B.4 Vent Damper Troubleshooting Guide
!
WARNING
Follow all instructions regarding safety operational
controls in this manual. Failure to follow these
instructions could result in death or serious injury.
When servicing controls, all wires must be
Note
labeled prior to disconnection. Wiring errors
can cause improper and dangerous operation.
Do not turn damper open manually or motor
damage will result and affect warranty coverage,
use the service switch.
Do not cut plug off of damper motor assembly
this will affect warranty coverage.
Vent Damper Troubleshooting
Problem
Possible Cause
1. Off on limit (120VAC)
2. Bad transformer
3. Loose or broken connections
NO POWER
Between 4 & 1
4. Blown fuse or circuit breaker
5. Disconnect switch off
6. Harness not plugged into receptacle on aquastat
NO POWER
Between 4 & 2
1. Thermostat not calling for heat
2. Burned out heat anticipator
POWER
3. Loose or broken connections
Between 4 & 1
4. Off/On operating limit, pressure control or low water cut off
5. Off/On blocked vent switch or flame roll out
When calling for
heat
POWER
Between 4 & 1
1. Loose or broken connection
Between 4 & 2
2. Defective damper motor
DAMPER OPEN
APPENDIX B - VENT DAMPER INSTALLATION
Normal Sequence of Operation
24 VAC
Power ON
Power
4 & 1
All times
4 & 2
Calling for Heat
4 & 3
During combustion
Recommended Solution
1. turn limit on
2. Replace transformer
3. Tighten, repair, or replace connection
4. Replace fuse or reset circuit breaker
5. Turn switch on
6. Plug harness in
1. Turn thermostat up to call for heat
2. Replace thermostat
3. Tighten, repair, or replace connection
4. Turn operating limit, pressure control, or low water cutoff ON
5. Reset or replace switch
1. Tighten, repair, or replace connection
2. Replace damper motor assembly
34
Damper Position
Open or Closed
Open or Opening
Damper Open
Brown
Yellow
PN 240013340 Rev. C [12/02/2022]
Orange
Black
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