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neighbors heat pump, short cycle

Old 01-10-2017, 06:37 AM
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Default neighbors heat pump, short cycle

next door neighbor, now out of town, I watch their house, their heat pump doing something I have never seen before.
2 or 2 1/2 ton split system, outside (condenser) unit short cycles. it cuts on, compressor and fan run for 10 seconds then it all trips off for 30 seconds. Then does it again, this in cold weather 40 degrees.
thermostat has a low battery light on. condenser fan to me seems slightly slow but I don't think that would make a difference in 10 seconds.

any simple ideas? never seen this
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Old 01-10-2017, 06:44 AM
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Flame sensor. Easy fix, pull it out and clean it off with some rubbing alcohol.
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Old 01-10-2017, 07:05 AM
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thanks but its a heat pump, when heating the outside compressor and outside fan run.
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Old 01-10-2017, 07:07 AM
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Swap the battery in the thermostat. Mine did this as well. Swapped the battery out and all was well
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Old 01-10-2017, 07:52 AM
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Compressor short cycle= low refrigerant charge, poor air flow
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Old 01-10-2017, 08:09 AM
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Don't know if this will help but ours was running and would shut off and start again after a couple seconds. I replaced the thermostat on advice I got right here on THT. Problem solved. May be worth a shot. Chris
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Old 01-10-2017, 09:08 AM
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Low battery on the tstat may be causing a weak current to the cotrols so the unit thinks the thermostat it telling it to kick off then picks up the current again and starts back up. I say replace the battery and see what happens.
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Old 01-10-2017, 09:15 AM
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tripping on low pressure do to valves not opening or low on freon would be my guess.
If running on just batteries and not voltage from unit, I could see where stat would not work properly if batteries got too low
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Old 01-10-2017, 09:18 AM
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Turn it off til you get fresh batts in the tstat. Not good for it to cycle like that.
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Old 01-10-2017, 09:58 AM
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will let you know, the owner is coming tomorrow, and will change battery
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