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Question DetailsAsked on 6/2/2016

Put new motor on HVAC with dual zone and now a damper went out. Could it be related?

Our AC (Bryant unit) just went out and they said it was the motor, so they put in a new motor. We have dual zone temperature control. Now, when the downstairs is not calling for cool, it is still blowing cold air because the upstairs zone is calling for cool. So it is causing downstairs to be freezing. They are saying they think it is a bad damper. We did not have this problem before they replaced the motor, but they are saying the two are not related. Does it sound like a damper issue? If so, when they put in the new motor could it have affected anything with the damper?

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1 Answer


Unless they accidentally disconnected a wire to it, or failed to plug it back in at the furnace, not likely related. If it was out as soon as they turned the HVAC back on, I would suspect it was something they did to interrupt wiring or short it out. If it worked OK for awhile and then failed, I would call it coincidence they failed in quick succession.

Another possibility, if the damper is jammed due to dust bunnies (or dust groundhogs), sometimes a blower replacement mocves the air faster than the old one, so it picks up streamers and strands of lint and dust in the duct and blows it along, which can clog a damper and keep it from moving, because the electric motors or actuators on them tend to be quite weak.

Other remote possibility is they shorted out the thermostat during the work, which can cause it ot fail - until reset in some cases, permanently in othears. Or if shorted the wires and left them that way during the work, could have killed the thermostat battery. Or they turned it off during the work. I would check first that the thermostat is reading is right and is on and set to AC or COOL and is calling for cooling and the battery is good - then think about a repairman if that is not the issue.

Answered 4 years ago by LCD

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