Question about Mitsubishi Heating & Cooling

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This unit will not cool. The heat pump seems to work fine. Unit is fully charged. One tech seemed to think it might be a valve of some sort. Never been used.

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I would check the wiring between the indoor and outdoor units...
There also should be some led lights blinking that will help you troubleshoot the problem...

Here is a tip about Mitsubishi Air Conditioners and how to get the manuals for all of the Mitsubishi line. The manual include both troubleshooting and installation.

Mitsubishi Air Conditioner Troubleshooting and Repair


heatman101

Posted on Sep 12, 2010

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GE Zoneline 1000 - heat stopped working this morning, A/C is working fine, fan is working fine, buzz sound when heat is turned on as normal, thermostat seems fine as room is still warm, can turn thermostat...


Sorry to read about your problem, I hope this helps you out.

Sounds like you may a defective, reverse heat pump switch. If you were in Denver,Co I would be glad to work on it for you. They are no different than large units to work on.

and no, you cant work on the unit.....takes special tools


Just keep calling around for a person who will work on the unit..

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Don't know if unit is big enough without doing a manual j. But if house is well insulated and double pane windows it should be. You air handler should have heat strips in it for aux heat. If not then you should have some put in probably 10k. You can use emerg. heat but will run bill up. Need to have Freon checked in unit.

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I bought a new Goodman heat pump in jan 2010. It has a 2 1/2 ton compressor with a 3 ton A- coil. I was told by them this would work fine with an expansion valve.`I have had nothing but problem since...


The "A" coil will generally be larger than the outside coil as far as the tonnage goes. When a unit has an expansion valve the charge should be based on subcooling instead of superheat. The reason for this is that the expansion valve acts to maintain a constant level of superheat. The best solution may be to have all the refrigerant recovered, then weighed back into the system. The length of lineset should also be checked. Units come precharged with enough for 25' of lineset and the charge will need to be adjusted for more or less that 25'.

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I have a Klimaire 1200 btu heat pump split system brand new I installed myself (this is the third one I have installed). It worked fine for a couple of weeks and then the outside unit began to cut off...


Hi,
Often on those types of units they use a sensor to sense the temperature of the return line to prevent liquid floodback...
I am thinking the either there is a shot of really sold coming back soon after startup or that the sensor is bad and is being too sensitive, shutting the unit down when it really does not have too...after it does this once it is more stable and it does not happen again til the end of the cycle...

Actually I think that it may be overcharged and theat is what is causing the problem...
Do you have a very short line set on thsi unit??
Was it setup with a precharged unit and lineset??? or did you build the lineset and then charge it your self???

heatman101

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