20 Most Recent Mitsubishi MS12TN Air Conditioner - Page 3 Questions & Answers

If I was you I would pull the power disconnect to the condensing unit. You may also want to cover the condenser only to keep dogs or cats from urinating on the unit. If there is no possable way that will happen no need to cover it. When you come back in7 monts make sure the breaker is off to unit and wash condensing coil with high pressure from garden hose.

Mitsubishi... | Answered on Mar 30, 2019

Put on an inside wall away from doors or open windows 5' above the floor and if you have an air vent close shut it

Mitsubishi... | Answered on Mar 26, 2019

Indoor unit indicator
RUN lamp = 6 time flash
TIMER lamp = Comes on
Outdoor unit indicator (LED5) = Stays off
Description of trouble = Indoor fan motor error (2)
Cause = Defective fan motor, Connector poor connection
Conditions of flashing = When air conditioner is operating and indoor fan motor is turned ON, indoor fan motor speed of 400 rpm or under continued for more than 30 seconds. (Air conditioner stops.)

Mitsubishi... | Answered on Mar 19, 2019

Most likely, there has been an operational fault that has triggered a "lock out". This happens when either a mechanical or electrical component has failed, misreading, or if the system has lost refrigerant. You can try to reset the system (both indoor and outdoor units). That might restart it, but a repairman should be called to pinpoint the issue that caused the fault. There is a diagnostic procedure that can help with the diagnosis, but it involves opening the outdoor unit to read the LED's on the control board.

Mitsubishi... | Answered on Jan 26, 2019


power one first, then the other or the other first and then the one. check the power to both units, the settings, condensation pump interlock, no real quick fix until you know the charachter of that unit

Mitsubishi... | Answered on Oct 10, 2018

No Mitsubishi units are critically charged. Use only R22. They engineer the heck out of their units....they don't like other refrigerants in the system and won't warranty any problems with any other refrigerants

Mitsubishi... | Answered on Aug 22, 2018

What is the M# S# of the unit?

Mitsubishi... | Answered on Aug 21, 2018

What is the M# S# of unit. Without it I cannot find your codes. Have you cleaned the filter and condenser coil?

Mitsubishi... | Answered on Aug 21, 2018

You cannot set it that low. It depends on your outside temp? Have you cleaned the filters and condenser coil? The lowest I recommend setting it at is 20. Any lower and you could freeze up the indoor coil. Once it thaws out you will have more water than the pump/drain can handle.

Mitsubishi... | Answered on Aug 21, 2018

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