Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

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Mr. Slim PK 18 FK 3 will only cool for 3 minutes, then goes to fan only for 3 minutes, then shuts off completely with P8 00 flashing as an error message

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  • Mitsubishi Master
  • 43,501 Answers

Hi,
P8 usually is caused by a low charge...

Here is a tip about Mitsubishi Air Conditioners and how to get the manuals for all of the mitsubishi line. The manual include both troubleshooting and installation.

Mitsubishi Air Conditioner Troubleshooting and Repair


heatman101

Posted on Aug 31, 2010

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Open it and take a look, it could be debris or a loose wire.

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Might change the battery on your control. I wish these had a hard wire thermostat not a big fan of the remote can be confusing.

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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

Mitsubishi msz-ga60va not cooling. Did same last year then righted itself. Left light is flashing. and no cool air. Please help.


You didn't give any error code. But, still, I hope unit need complete service. Do it and check again.

Jan 07, 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

Outside cooling unit shuts down after approx. 5 min. Of operation ?


Check condenser fan motor. If that goes faulty, shut down will occur.

Jun 15, 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...

2 Answers

No cool air


it is quite posible the unit is short of gas. this could make part of the indoor coil colder than the rest.

Feb 18, 2009 | Mitsubishi Mr. Slim MXZ30TN Air...

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