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APPENDIX B - VENT DAMPER TROUBLESHOOTING
Problem
Possible Cause
Recommended Solution
NO POWER
Between 4 & 1
Between 4 & 2
Between 4 & 3
Damper OPEN
NO COMBUSTION
1. Is gas turned on
2. Operating limit, pressure control, low water cut off not on.
3. Blocked vent switch or flame roll out switch tripped
4. Loose or broken connection
5. Defective component in appliance after vent damper
1. Verify gas is on
2. Verify operating limit, pressure control or low water cut off is
on
3. Reset or replace blocked vent switch or flame roll out switch
4. Tighten, repair, or replace connection
5. Replace defective component in appliance
Damper Sticks
1. Damper blade obstruction
2. Damper pipe egg shaped, out of round/binding.
3. Crimped end of vent piece inserted in too far
1. Clear the obstruction
2. Restore to damper pipe to round, verify not binding.
3. Correct the condition
Damper Rotates
Continuously
1. Defective damper motor assembly
1. Replace damper motor assembly
Note
For troubleshooting only. Verify damper is in
open position. Use service switch to keep
damper in open position. Place jumper between
2 & 3. If appliance fires, remove jumper and
plug receptacle back into damper controller
plug. If appliance does not fire, replace damper
motor assembly. Do not replace pipe assembly.
If damper motor assembly is not available,
place service switch in hold open position. This
should keep damper in open position and allow
customer to have automatic heat. Return or
replace the motor assembly at your convenience.
Motor assembly carries 18 month limited
commercial warranty from the original date of
purchase. (Refer to form #4294 on vent damper
manufacturers website). Pipe assembly is not
warranted.
Trouble Shooting with Jumper Wire In Place
