Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

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Coils stop feeding intermittenly not always the same circuit

Our Mr.Slim dual zone system has two 15,000btu indoor units with matching outdoor compressor. I can turn both on and it cools well but after a little bit one or the other will continue blowing but not cooling even though it has not reached the temperature (for instance 75 degrees) while the other continues cooling well below the temperature requested. It feels like we're chilling milk in one room and way too warm in the other. I tried resetting the remotes but it didn't change anything. It seems that whichever indoor unit comes on first is the one to stay on and keep cooling and the second one turned on is the first to stop cooling. The fans work great and dampers etc is top notch but it seems like the refrigerant stops passing in one or the other for some reason. Any fixes that can be done? Surely both can be run at the same time! Thanks for giving this a think. all coils dont always feed. one will work and then two days later it stops working and the other two work cannot figure out what is causing this problem customer says same thing happened last year

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You could have a solenoid prblem or just low of refrigerant. Need a qualified service tech to check charge. Rusty

Posted on Jun 07, 2009

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Posted on Jan 02, 2017

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1 Answer

Why is Mr Slim MS-SGF24VC outdoor unit working when indoor unit off


Possibly a bad control board in the outdoor unit. Pull the disconnect outside to stop machine, wait 10 seconds and out back in. White mist was likely frost built up on indoor coil due to condenser running without the fan.

Jun 11, 2017 | Heating & Cooling

2 Answers

P8 showing on air cond and air con is not working


P8-Abnormality in outdoor unit.

Solution:
1) Check the indoor/outdoor connecting wire in proper point.
2) Change the connection of electric wiring, if reversed phase.
3) Check the protection device, if malfunction, replace it.
4) Measure the resistance of the outdoor coil thermistor.
If the resistance is normal, replace the
outdoor controller board
Thanks.

Feb 05, 2011 | Mitsubishi Mr. Slim MXZ30TN Air...

2 Answers

We have a P8? CAN'T FIND MANAUL


P8-Abnormality in outdoor unit.
1.Wrong wiring of indoor/outdoor
connecting wire.......................Check the indoor/outdoor connecting wire.
2) Reversed phase......Change the connection of electric wiring.
3) Protection device is working........ Check the protection device.(LP,HP)
4) Damaged outdoor coil thermistor.....Measure the resistance of the outdoor coil thermistor.If the resistance is normal, replace the outdoor controller board.
5) Check out door coil is cleaned. If not do it.
thanks.

Jan 30, 2011 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

I have a Mitsubishi electric Mr Slimair conditioning. It runs a few minutes in cool mode, then it stops and an error of P8 code appears. When it runs, the fan is not strong.


P8-Abnormality in outdoor unit.
1) Wrong wiring of indoor/outdoor
connecting wire
2) Reversed phase
3) Protection device is working
4) Damaged outdoor coil thermistor

Solution:

1) Check the indoor/outdoor connecting wire.
2) Change the connection of electric wiring.
3) Check the protection device.
4) Measure the resistance of the outdoor coil thermistor.
If the resistance is normal, replace the
outdoor controller board.

Hope,it's helpful.

Jan 15, 2011 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

Its not working and flashing P6. Its a Mr Slim


dear sir/madam i think.... mr Slim A control R407c & R410a systems.
P6 = indoor coil frost protection in cooling or indoor coil overheat protection in heating.

Cooling
One of the 2 indoor coil sensors reads minus 15 deg C for 3 mins.
Heating
One of the indoor coil sensors reads over 70 deg C.

If you are sure the refrigerant charge is correct & system operation is correct then it could be a coil temperature sensor reading wrong temperature.
If you have one of those little monitor things which plug into the outdoor circuit board you can monitor the indoor coil temperature.
On later type remote controllers you can get all operating data like temp sensor data but you will need a service manual to do this.
Or you can measure the ohms resistance of the temp sensors & compare with the chart in the service manual. if you can do it by yourself do if not then contatct ot mitsubishi maintenance personnnel for furhter action, thank you hope answer the question please vote!

Sep 23, 2010 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

Fan works, air conditioning does not. Try resetting the power (in the proper sequence - outdoor unit followed by indoor unit). Air conditioning came on briefly (less than a minute) than stopped, leaving...


Without seeing the unit,

1 - the condenser fan (which is in the outdoor unit) could be blown. This would cause the unit to go off on high head pressure.

2 - it could be low on refrigerant, which makes it do nothing but blow room temperature air around. The unit would go off on low pressure

3 - the filter is dirty, blocking the cooling

4 - the compressor could be shorted, or a corroded wire somewhere that feeds the contactor

Mr. Slim Ductless Splits are the best on the market and should only be repaired by a trained technician.

Hope this helps.

May 28, 2010 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

My mr slim is not blowing cold air, just warm, and a message P8 is flashing


P8 means "Abnormality in Outdoor Unit"

Possible causes
1 Wrong wiring of Indoor/Outdoor connection
2 Reverse Phase
3 Protection Device operated
4 damaged Outdoor coil thermistor

Aug 05, 2009 | Mitsubishi Heating & Cooling

1 Answer

Mr.Slim Mitsubishi dual zone system


We had that problem with two units that we just had installed. Both are hooked up to one compressor. After several calls and the service person coming out twice, it turned out that they had two wires mixed up when they did the installation. Once they switched the wires the units ran ok.
BUT...now we are having another problem with the units/compressor not working after losing power in our house. We lose power on a regular basis here. Does anybody know if that means we will constantly need to call the service people to come to get the compressor working again? Or is there anything we can do to reset it? The service person that came today was not very helpful and didn't have a lot of answers for us.
Thanks

May 18, 2008 | Mitsubishi Mr. Slim MXZ30TN Air...

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