Odd/peculiar Observation

16 years ago

For months now I've been trying to figure this out. I have heatpump to heat/cool my approx 2000 sq ft brick ranch home. Split plan, mbr and one large 20x 30 air intake into air handler on one end and two bedrooms seperated by a hallway with a bath off that hall way on the other end. Directly above hallway is another small air intake and just across that hallway from the bath is the thermostat.

Here's the weird, everytime I run the exhaust fan in the mbr bath OR run the dryer which both are at the opposite end of the house and the thermostat. The air will come on and absolutely will not shut off until I shut off the the exhaust fan or dryer. Mind you this is not simultanteously.

What is up with that? Anyone have a clue as to why this happens? I'm at a loss.

At first I didn't put 2+2 together and I replaced the thermostat thinking that was the issue with the air coming on and not shutting off...by queer coincidence did I figure this with the mbr exhaust fan and dryer.

So anything exhausting out of the house makes the a/c or heat come on and run and run and run. Anyone have a solution?

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Comment (1)

creek_side
16 years ago
Does it come on immediately as you turn on the fan or drier, or is there some delay? If so, how long, and is it consistent?

When you replaced the thermostat, did you notice if the hole in the wall where the wires come through was sealed or not? Did the hole seem overly large?

When you turn on the fan or dryer, make up air has to come into the house somewhere. It's conceivable that exterior or basement (if applicable) air is getting into the wall cavity and exiting through the thermostat wiring penetration. That would cause the thermostat to turn on if the exterior or basement air was hotter than the interior air (AC mode, summer) and vice versa (heating mode, winter)

Your answers to the questions I posed will assist in determining if the above is a likely scenario or not.

If the unit turns on immediately as you turn on the fan or dryer, then I would suspect some sort of wiring/electrical issue.
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