Question about Carrier Heating & Cooling
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.
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Posted on Apr 03, 2011
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
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Posted on Jan 02, 2017
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