Skip to main content

Topic: Air conditioner short cycling (Read 207 times) previous topic - next topic

0 Members and 1 Guest are viewing this topic.
Air conditioner short cycling
One of my AC units is short cycling. If the set temperature is well below room temperature, it works fine, running continuously until the temp is where I want it.

After that, when the room temp is only slightly above set temp, it short cycles...

Guests must Login or Register to view full posts.
  • Last Edit: July 10, 2019, 09:38:07 am by wolfe10

  • Tim
  • [*][*][*][*][*]
Re: Air conditioner short cycliny
Reply #1
Vent pointed at the temperature sensor?
Thermostat delta temperature to low? E.g. 2 degrees hysteresis.
Defective AC controller PC board?
Low 12VDC voltage?

Re: Air conditioner short cycliny
Reply #2
How do you set the thermostat hysteresis ?

Vents are not pointed at the sensor.

12 volts is fine everywhere else

I hope use not the pcb.

Re: Air conditioner short cycliny
Reply #3
Sounds like somebody took out or adjusted the time delay relay. Relay is there to let head pressure bleed off between cycles. Are both units doing this? I think your in or near Alaska where ambient temperature is lower. Hope fully they just...

Guests must Login or Register to view full posts.

Re: Air conditioner short cycliny
Reply #4
The time delay relay seems to be working. That explains the wait before it cycles again.

I'm thinking it's either the hysteresis adjustment or a bad electrical contact on the thermostat wiring.

Or the control board.

Re: Air conditioner short cycling
Reply #5
It might be easier to replace the thermostat than troubleshoot the issue.   
Has the thermostat has been in the same location for a long time?  pc