38
B.4 Vent Damper Troubleshooting Guide
Note
When servicing controls, all wires must be
labeled prior to disconnection. Wiring errors
can cause improper and dangerous operation.
Do not turn damper open manually or motor
use the service switch.
Problem Possible Cause Recommended Solution
NO POWER
Between 4 & 1
2. Bad transformer
3. Loose or broken connections
4. Blown fuse or circuit breaker
6. Harness not plugged into receptacle on aquastat
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
NO POWER
Between 4 & 2
POWER
Between 4 & 1
When calling for
heat
1. Thermostat not calling for heat
2. Burned out heat anticipator
3. Loose or broken connections
1. Turn thermostat up to call for heat
2. Replace thermostat
3. Tighten, repair, or replace connection
5. Reset or replace switch
POWER
Between 4 & 1
Between 4 & 2
DAMPER OPEN
1. Loose or broken connection
2. Defective damper motor
1. Tighten, repair, or replace connection
2. Replace damper motor assembly
Vent Damper Troubleshooting
WARNING
Follow all instructions regarding safety operational
controls in this manual. Failure to follow these
instructions could result in death or serious injury.
!
24 VAC
Power
Power ON Damper Position
4 & 1 All times Open or Closed
4 & 2 Calling for Heat Open or Opening
4 & 3 During combustion Damper Open
Normal Sequence of Operation
APPENDIX B - VENT DAMPER INSTALLATION
Orange
Black
Brown
Yellow
PN 240012787 Rev. C [11/15/2020]
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