Question about Carrier Heating & Cooling

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My Carrier Central AC unit is acting strangely ... when I set it to cool the outdoor compressor (and comp. fan) kicks on as expected ... about 30 seconds later it shuts down but then restarts again in another 20 seconds or so only to shut off again shortly thereafter and it keeps repeating this cycle. I thought it might be a defective thermosat and I replaced it with a new one yet same proiblem ... any thoughts or suggestions ??? Thanks

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  • Harold McCormack Apr 02, 2011

    Thanks for the quick response ... this is a Carrier central air/elec furnace system ... the furnace works fine when I turn the thermostat to heat ... but when I tried to use the AC for the first time last week (it wokred fine last summer) the air handler fan that cirrculates the air in the house comes on and stays on (like it should) and the outside compressor and fan come on like they should ... but about 20 seconds later though the outside unit (compressor and fan) shut off but the indoor blower fan stays running ... after another 20 seconds or so the outdoor unit kicks on again only to shut off again in another 20 seconds or less ... it keeps cycling like that although I didn't let run too long for fear of damaging something ... we had an unusually cold winter this year could that have damaged something on the outside unit ??? ... this morning I took the panel off the indoor unit to check the evaporator coils for cleanliness and looked at the wiring from the thermostat to the electronics ... the coils were clean and I did not see any obvious wiring meltdowns although I'm really not sure what to expect ??? .. I bought the entire system new 6 years ago .. thanks

  • Harold McCormack Apr 02, 2011

    clean what ??? .. the inside coils or the outside coils ... I cleaned the outside coils last summer and everything inside and out looks OK ... rm

  • Harold McCormack Apr 03, 2011

    Great info

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  • Carrier Master
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Since you did not include a model number I can not verify this but there are a few things that cause this. the first being a low coolant switch that is being actuated because once the pump kicks on the pressure drops on the low pressure side below the switch actuation point. The 2nd reason would be the capacitor that is not maintaining enough run capacity to keep the compressor running. (i.e higher than normal internal resistance of the capacitor due to breakdown of the internal components of the capacitor. There is a contactor also can cause this problem if the springs that maintain contact tension are weak or the contacts are just not making good contact and they heat up rapidly. If your pretty savvy you can remove the contactor contacts and clean them up then reinstall them. The biggest hassle in this task is re-installing the contactors' contact tension springs. Just make sure you turn off the Power / AC CBkr before working on this.

Just a note some units do NOT have a system low pressure switch. Many do.

One question... Is the fan always running and the compressor kicking on and off? Or are they both cycling?
If both are cycling then suspect the contactor or low pressure switcfh. If only one is cycling suspect the capacitor.

Thanks for choosing FixYa,
Kelly

Posted on Apr 03, 2011

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  • Master
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Ok Let me make sure I understand. The inside fan goes off and on ot both inside and outside. When you say off and on how long does it stay off and on.


Are you talking about the condensing unit outside or the indoor fan? If it is the outdoor unit you COULD be short cycling on a pressure switch that auto resets. I thin k you should call a service tech.

I am sorry. I think this is a package unit, If the entire unit is shutting off it is high pressure or low pressure switch. Turn thermostat to the fan on position and see if fan runs. Get back to me.

Just trying to eliminate thermostat.. There is fan relay in air hanlder that is bad if thermostat is oK. It is a time delay relay and goes bad quite often on Goodman units. If you take the front off of the air ahndler you will see a small black sequencer. Turn power off before you look inside and check for loose or burnt wires on the unit.

Do you see the wiring that comes from thermostat. it may be on top of unit. There should be red ,yellow and green wire from thermostat. Turn power off. The wires these attach to at furnace twist together and turn power on and see if unit operates.

Fan relay should have 1 2 3 terminals on it. Fan motor goes to 1 wire off heat equencer goes to 2 and 3 to power. Jump 1 amd 3 .to see if fan runs

Posted on Apr 02, 2011

  • SANYADE  OMOTOLA
    SANYADE OMOTOLA Apr 02, 2011

    When last did you clean it ?

  • kamal May 15, 2013

    did you resolve the problem, if so then what was the casue, i got exact same problem now

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