My heat pump won't shut off on its own!
I have a 2 ton Payne heat pump that is truly living up to its name "Pain". It's performance is very inconsistent. 99% of the time, the heater runs constantly. It won't go into on/off cycles on its on. 1% of the time it will remember how to work correctly, and may cycle on and off a few times. That usually lasts a few hours, or a day at max. I've had at least 8 technicians out to my house trying to get to the bottom of what's wrong with this thing. The one technician said there was a "back feed" problem in one of my wires. He replaced the wires, but that did nothing. The last technician changed out the thermostat. That did nothing as well. I know very little about heaters except to know that a heat pump running all the time is not normal... something a technician tried to convince me of.
I'm having yet another technician out to my house on Saturday, and would like to have a few ideas as to what he should be looking at.
There is something odd about my system that I think may be a clue as to what's wrong with my heater. Here me it, I know its weird. This is actually the 2nd Payne heater I've had in less than a year. The first unit I got had to be replaced because of a faulty defrost system. The previous heater, and the one original to the house did go into on/off cycles consistently. What was unusual about them is that when the air blew the vents, it caused the main heat duct on my main floor to make an annoying rattling sound. One of the things that's different about my current heater is that it doesn't do that. However, there was this one day, about a week ago, that my current heater was blowing hard enough to make the vent rattle. Coincidently, the heater worked perfectly that day. It cycled on and off throughout the day just like a good heat pump should (and it wasn't even that warm outside). Unfortunately, the rattle went away by the end of the day along with the on/off cycles.
What would affect how hard my heater blows? Could that be a reason as to why my heater doesn't cycle on and off? Both of my previous heaters were 2 ton heaters as well.