Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

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Unit will heat only will not cool and how to repair

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We have a split type gree aircon, with one (1) horsepower. it was just newly installed, around 6 months ago. we are just surprised that one when my wife turned it on, thru the use of its remote control, the indicator box on the aircon reads or flashes "F2". I detached the batteries of the remote control for severa hours and I also detached the power cord from the wall socket, but it was to no avail. it did not work. with "F2" on the indicator box, the aircon won't give cool air, it is just working like an ordinary fan. please help us.

Posted on May 29, 2011

  • Terence Fourie
    Terence Fourie Aug 01, 2012

    You wont believe how streight forward wiring these split aircons are, but when rushing, small wiring mistakes do happen. Most of the time the control wiring comes with the aircon and is pre connected into the inside unit allready.. Suggest you switch off at isolator and or pull plug out of the socket then open the inspection/ wiring compartment on the side of the outside aircon.(condenser unit). you will see possibly 2 sets of wires and if larger than an 18000btu unit, there should be a thin set of black plug in wires for the auto defrost sensor. On the wires going into the connector terminals there should be numberscorrelating their connection points. eg. L (LIVE) will go to l on the termonal block. 1 will go to 1 on the block and so forth. Check that those wires are correctly placed or the incorrect output from the control board will go to the incorrect component in the condenser unit. If all is good, then very possibly the 2 way valve is stuck, then you will need professional help. Just out of interest, it should be in warrenty so checking the wiring will be all you could do.e


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Posted on May 17, 2011


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If not yet,go to the nearest repairman to repair that units.

Thank you,have a nice day.


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