A/C Compressor Does Not Always Come On When Tstat Calls For Cool

by Jon
(Magnolia, TX)

Question:My center unit, 13,500 BTU AirXcel/Coleman unit will come on when thermostat calls for cool, and fan comes on immediately. The compressor does not come on at that time, and seems to be trying. After a few tries the other day, the compressor did come on and stay. Do I have a bad start or run capacitor that I should check?

Robbie: Yes it could be the start or run capacitor or it could be the time delay to the compressor or the pressure switch on the compressor. It could also be the thermostat sending a intermittent signal. Unless your familiar with the system I suggest you have a tech look at your AC because the voltages are very high at the capacitors even when the voltage is shut off and dangerous. Please be careful.

Thanks for the Question Good Luck,

Comments for A/C Compressor Does Not Always Come On When Tstat Calls For Cool

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Aug 25, 2015
AC compressor not always working
by: Anonymous

Hi, I have the same unit as yours and I am experiencing the same problem. Can you tell me what you did to fix it? Thank you!

May 30, 2016
At don't always kick on
by: Steve

When it comes on its cold and works great ,but there is about a 25 second delay for the compressor to kick in, when it shuts off , the fan will kick on but not the compressor .

Jul 08, 2016
same as you
by: dale

I have the same problem you have I have checked both capacitors and both test good but still have the same problem any help would be appreciated

Jul 20, 2016
AC unit not coming on
by: Gary

When switching thermostat from heat to cool AC does not come on. Did work fine 1 month ago. Now switched it on & nothing.

Jul 30, 2016
Where do I find the start/run capacitor
by: Mark

My system is doing the same. Do you know wher the start run capacitor is located?

Aug 14, 2016
Erratic AC
by: Grannie

My issue is similar. When thermostat is on cool, the coach "grunts" at 15 or 30 second intervals, and the compressor sounds like it is trying to start. Sometimes it does. A new issue added, The thermostat ticks when turned to on or auto. Ideas?

Oct 16, 2016
coleman air
by: jim

having problem with the unit when i turn it off it stops blowing air but keeps humming i kill the power then turn the power back on and it starts to hum again the unit seems to work fine other than that so i cant charge my batteries with the unit still engaged anybody ever have that problem tks

Mar 13, 2017
a/c not working
by: Anonymous

we have turned on a/c unit. It seems to try, then nothing. Now we turn it on and it automatically kicks off breaker. suggestions on checking it?

Apr 06, 2017
same thing NEW
by: steve

- Unit hardly ever kicks the compressor on. Never had a problem with a Coleman until I got this one,now made in China,for Coleman.

Jun 15, 2019
Compressor works half the time.
by: Anonymous

I've been trying to get my problem diagnosed. When connected to shore power, many times my compressor will stop working after the A/C has been running for several minutes or even hours. I can always get the A/C unit restarted after I disconnect power cord to the unit, after I've opened up the ceiling assembly to the A/C. I never have this problem whenever the RV is running under generator power. No one seems to be able to diagnose this issue. Everyone says my compressor is bad & replace the entire unit. But if the compressor is bad, then why does the A/C run like a champ everytime its running on generator power all night long?

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Robbie Warford, San Diego RV Repair

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