Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

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Mitsubishi MSH12TH heat pump air handler 110v

Electrican wired in 230v to,two air handlers. On a 110v units. Mother boards fryed. I replaced the boards. Only one remote controller was given for two air handlers. system was restarted. It cooled for 20 mins. Then fan cut off and coil started to get frozen. Compressor continued to run. I am going to change the reciver board and get one more remote controller. I think the communition link between the reciver board and fan are not being kept in memorey. Or the fan drops out on over load due to the 230v. If the voltage made it that far before the board got cooked.

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Wireing this type AC with the wrong voltage, will damage more than the circuit boards. I think the installer wil need to be responsible for the damage he created. The factory will also try to get out of the replacement because of the installers lack of know how.

Posted on Oct 20, 2007

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1 Answer

Can i run a heat pump & air handler on the same 208/ 230v wire?


Read the nameplate on the compressor and on the air handler's blower motor. That's the only way to know what the load will be.

Sep 25, 2014 | Heating & Cooling

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HE heat pump won't talk with old air handler?


The fact is, the air handler supplies the voltage, blower, and electric heat. In order for the heat pump to work correctly, the wiring from the thermostat and heat pump need to be hooked up right to the air handler. The thermostat is what tells which component to come on. If the fan stops, but the condenser keeps going, you either have a faulty fan relay on the air handler, faulty thermostat or wiring, faulty wiring at the heat pump, or the contacts on the new unit are sticking, which is highly doubtful considering it is working now. I hope I have helped you understand this a little more. Good luck and don't let them push you around, get someone that knows what they are looking at.

Jul 18, 2012 | Goodman Heating & Cooling

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Marion, if there was a lightning strike and then a power surge when the power came back ON, I don't doubt what the servicemen had to say. The age of the unit plays no role in it, when something like this happens. Power surges can be killers to electrical appliances. That's why it always wise to turn the unit off during a power outage. Just ask anyone who was in Irene's path a couple of weeks ago. Power went out for days & weeks for some, when it came back ON, electrical appliances were damaged or ruined or started house fires.

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1 Answer

WIRING THE THERMOSTAT TO AC UNIT THEN FROM THE UNIT TO HANDLER


Generally, you would go from the thermostat to the air handler, and then, from the air handler to the outdoor unit. I don't know if you have a heat pump or not, so I will give you a simple diagram and you can contact me if you need more.

Thermostat : Y G R W and sometimes C
Air handler: Y G R W and C
Outdoor unit: two wires connecting to the contactor ( not heat pump)

Thermostat; Y--------------Y(air handler cooling)------------------one side of contactor, outdoor unit
G-------------G (air handler, fan)
R--------------R (air handler ,hot)
W-------------W (air handler, heat)
C--------------C (air handler, common)------------other side of contactor, outdoor unit

This is a typical wiring diagram. Just contact me if you have something different. Hope this helps. Stay cool. mark

Jul 10, 2011 | Heating & Cooling

1 Answer

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Dont know what equipment you have but yes of course there is a fix. Turn power off to air handler. cycle power to heat pump and be sure the board is configured properly to match your outdoor unit. Then turn power on to indoor unit and likely go through system setup once again. provide model numbers of all communicating components if more problems.

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Dec 10, 2017 | Goodman Heating & Cooling

1 Answer

My goodman air handle is run on e-heat only and will not turn off ,also the outside unit will not turn on , I put a new themostat this didn't help I have a goodman heatpump


Heat-Pumps can be temper mental. Sounds to me like your air handler is running on emergency heat, due to a problem with the condensing unit.You have heat strips in the air handler in case the outdoor temp. gets to cold and the heat pump cant keep you're home warm.Also, if you loose a compressor, it will go into emergency heat. If you have lost the compressor for one reason or another, lets say a locked rotor, the compressor would draw L.R.A. (Locked rotor amps) and cause the circuit breaker to trip. Check this.As for the air handler running all the time, you said you replaced the stat? When you removed the control wiring from the stat, did the fan shut off? I wish I were on site to help you, but all I can do is offer you some advice. With the power off to the air handler, go to the stat and remove the red and green wires. Turn power back on and see if it stops running. If it stops, then it sounds like the new stat is also faulty? If it continues to run, check the wiring in the air handler to make sure the red and green are not touching somewhere, and also check the control wiring on the outdoor unit for the same problem. Do you have any dogs that may have chewed into wiring? If so, check all outdoor t-stat wiring. There are so many things it could be and I hope very much I have helped you with solving this online, which can be difficult. You may also have a faulty defrost board. Try to do what I have asked of you.
Good Luck, Sincerely, shastalaker7

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1 Answer

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Do you have the model number? This would help find the code

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1 Answer

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