Question about Mitsubishi MS12TN Air Conditioner

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Mitsibishi ceiling box

Heater does not work also it does not blow air the iarflow wings do turn only fan works when using fan

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Re: mitsibishi ceiling box

Check your switch,maybe you have a defective switch.

Posted on Jan 21, 2008

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Why would my combo A/C - Heater unit not blow air while heating or cooling is selected but will blow air just fine when set to "fan only"?

Sounds like wiring issue to me. I've delt with units like this and there is a wire lead for fan only and a separate one to run the fan when the unit is cooling or heating. I'm only speculating here but I would bet money that this was improperly installed.

Dont get discouraged though because it sounds like its working (for the most part) if you feel up to the task find the manual and check your connections. Otherwise hire a professional.

Sep 20, 2014 | Air Conditioners

2 Answers

I have a new Salem travel trailer with Dometic products. Everything appears to work fine, but when I run my furnace and it turns on, my fan blows from my AC unit. I have owned 2 other RV's but...

Yes it sure does sound like something may be wired wrong, Could you please reply with model number of your AC unit as well as thermostat model? To find your AC unit model number if you don't already have it, remove your ceiling air filter assembly, and it should be on the base of the roof unit, facing you.
The base of the roof (upper) unit will have a model and serial number, and if you see a control box where all the wiring attaches as well, get model number from that too if you will. Those numbers should make it easier to determine exactly where the problem is. Thanks.

May 28, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a peugeot 307 sport disel with dual climate control. The drivers side is working fine. The passenger side only blows warm air. It looks like the dial dosnot work. Thi shappend when the blow fan and...

behind the dash at either side are small motors for opening and closing flaps to allow hot or cold air flow. the motor turn a small plastic gear, the teeth on the plastic gear wear smooth and the frce of the blowing air pushes the flap to the warm position. its an awkward job to repair as the whole dash and heater box has to come out to do it

May 20, 2010 | Air Conditioners

1 Answer

The fan on my duotherm a/c doesn't work. I can hear the compressor come on but the a/c doesn't blow any air. There was a fairly loud pop when it quit working. Am I looking at replacing a condenser or relay...


Apr 18, 2010 | Dometic Rooftop RV Air Conditioner

2 Answers

My A/C blows out hot air every couple days

The only problem I could think of is that the air conditioning needs to be recharged as they call it because over time it will run out. You can usually go to a place like Firestone and they will do it (depending on how much you need) for around 100 or you can find a way to do it yourself you would buy either R134A or Freeze 12 that might be harder to get but cheaper

Aug 19, 2009 | Whirlwind FH-778 Air Conditioner

1 Answer

Weather King blows fuse in Criterion II furnace

You probably have a shorted wire between the heater and the a/c. There are two wires that conncet the control power to the outdoor a/c from the heater they should be on terminal c & y in the heater. disconect those two wires and try it again if the fuse doesnt blow you have a short in the wire between the a/c & heater

Jun 01, 2009 | Weather King 10AJA2501AH Air Conditioner

1 Answer

Heil airconditioner is not cooling? Heater works

If no blowing air is coming out to your ac or evaporator fin,your blowing fan is not working.There are several factor to check qualified electrician or ac techician should do this.If you have knowledge on electricity and motor control,beside you should have clamp ammeter to use in trouble shooting of ac electrical circuit.Unplug your ac If there is an opening of blower fan of your ac mostly the top cover open this one locate the wire connection of blowing fan take the color and size.Open the terminal box below the control panel of ac and locate the wire of blowing fan.Check how many leads make sure to make sketch where it was connected from low,medium, and high there is coded color on it,discannect from the terminal, using clamp ammeter set to ohms probe setting R10 check continuinity of winding motor start at common lines(mostly balck color) of one test rod and the other to starting line(mostly red color)take and read the resistance if has a higher resistance your motor is burn out, also with the running line w/c has multple line for speed.If resistance complied to your motor rating or good,If not or burn out replace fun motor.Check your capacitor,doing this set your ohmeter to a higher resistance,connect one red test rod (+) one terminal of capacitor and one black test rod on (-)the other terminal the pointer will deflect steady to higher resistance then reverse the connection of the test rod,the pointer deflect again to higest resistance it will go slow backward setting to zero if you got this result your capacitor is good.But if it does not go set back to zero your capacitor is short.Replaced capaciter.

Mar 10, 2009 | Air Conditioners

1 Answer

Aircondition er turns on starts to cool then shuts off and only the fan is on

dear nchase
This problem generally occurs due to the following reasons. I've included the solution too.

1.Windows and air vent wings maybe open .Close windows and vent wings
2.The compressor belt is slipping. Try to Tighten or replace compressor belt
3.Heater is on. Shut heater off
4..Condenser is clogged with debris. Clean the condenser .
5.Refrigerant has escaped through a leak in the system. Have system checked .
6.Receiver/drier is plugged. Have system serviced.

Try these solutions. Do respond with your comments please.
With regrads

Jul 09, 2008 | Haier Air Conditioners

1 Answer

Fan Only Won't Work

I jumped the rc and rh wires in the therostat box and now have fan only when selected.

Jul 01, 2008 | Air Conditioners

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