Compressor Wont Kick Back In - HVAC - DIY Chatroom Home Improvement Forum

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Old 08-20-2009, 05:16 PM   #1
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compressor wont kick back in

I am having a problem with a friend of mine's A/C unit. It has a 17degree temp split but the compressor drops out now & then & wont come back on for a long time. My gauges show that the pressures are not equalizing after it kicks out, to allow the pressure switch to let the compressor restart. There is an expansion valve on the system. She tells me that the entire system was just replaced about 2yrs. ago. Any suggestions??? Its hot here in Houston & she is an elderly woman.


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Old 08-21-2009, 05:26 AM   #2
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Low pressure problem

Sounds like something is wrong with the pressures in the system, the low pressure cut off should not be holding the compressor out it is in the safety circuit to shut down for low pressure only not to cycle the unit.

On some pump down systems it is used to start and stop units with a positive shutoff solenoid, mostly commercial and industrial systems with receiving tanks.


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Old 10-07-2015, 09:20 PM   #3
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What type of compressor is it scroll or recip.? how long does it take for the system to equalize? Recips usually need a hard start capacitor to start
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Old 10-07-2015, 11:39 PM   #4
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Does the compressor shut off while the fan continues to run, or does the entire unit shut down while there's still a call for cooling?

The pressure cutouts will shut the entire machine, wheres if it's just the compressor, you have an overheating issue.

If it's just the compressor cutting out, check:

1. The run capacitor, this could be going bad but still allow the compressor to start up. the capacitor impact motor operation, not just starting.

2. Compressor amperage draw

3. The outdoor coil - could be plugged with lint. (this will also trigger a high pressure cutout to shut the machine there)

I guess if it's the pressure cutout, you have to figure out why. Maybe see if it's the high or low (if applicable, it may only have high or low pressure) Could be a txv issue, could be a charge issue, could be many things.

Would need to monitor operating pressures, line temps as well, what the pressures are when it cuts out.

If this is a heatpump try running it in heating mode (with most of the outdoor coil covered if it's very warm) -> that could bypass the indoor tx valve (there's a check bypass valve, the indoor tx valve only does anything in cool mode) to see if it still trips out.

Last edited by user_12345a; 10-07-2015 at 11:49 PM.
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Old 10-08-2015, 03:51 AM   #5
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Old 10-08-2015, 05:27 AM   #6
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Hope he got it fixed or replaced in the 6 years since he started this thread.


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