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Old 07-24-2021, 04:46 PM   #1
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Intermittent problem with my Coleman Mach 8 15K heat pump

My one remaining original rooftop unit is acting up. Its behavior is very puzzling. Here's what happens. If the AC has sat off for a week or so (I don't have an exact amount of time, but it is more than a day or two), the compressor and blower turn on and run for about 3-40 minutes. After that, the compressor shuts off and the blower continues to run. After 3 or 4 days, it will run again for about 30-40 minutes.

In trying to diagnose the problem, I tried short the red and yellow wires on the thermostat. According the the pin out on the thermostat, this should turn the compressor on. The first time I tried it, the compressor fired right up. I put the thermostat back and everything was fine for 30-40 minutes when the compressor quit. I tried the red wire to yellow wire trick again and I could hear the relay click, but the compressor didn't start. 3 or 4 days later, it did.

Since I can make it fail and it takes so long for it to start again, I am guessing this isn't a temperature, freeze, or pressure problem. I would think overnight would resolve any one of those issues. On the other hand, I am not so sure about the start and run capacitors. I am not sure how they fit into the equation. If one of the caps was leaking or shorted, could it take days to resolve?

I recently had foot surgery and cannot get on the roof. I have a mobile repair guy coming over next week and I am hoping to get him to diagnose the problem and repair it, rather than telling me I need to replace the unit.

Has anyone seen this problem or can anyone steer me somewhere I can get some help? Thanks in advance.
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Old 07-24-2021, 05:10 PM   #2
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Based on the symptoms, and the situation, I'd carry a set of caps up there with me. Also, your Coleman is newer, so I'd be looking for something that's gone bad, not just aged out. As you say, it doesn't sound like there's a bad compressor. If it was bad, you'd most certainly hear some weird noises as it started up or while running. I don't know about your model, but in the old days, compressors sometimes came with their own start relays, and your symptoms remind me of that being bad. Not sure modern ACs have those any more though.
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Old 07-24-2021, 11:02 PM   #3
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I guess I should have posted the model. It's a 47074A879.
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