Question about Mitsubishi MSH09TW Air Conditioner
Inside unit turns on lights start to flash and outside unit doesn't turn on
The Mitsubishi units have to be reset by turning off the indoor units by switching the remote or thermostat to off. Then turn off the breaker to the outside unit(s). After 30 seconds,turn on the breaker and then you can turn on the remote for cool. If no lights come on on the inside units, most likely you have blown a fuse soldered on the main PC board. At this point, call your technician. A goos tech will be able to wire in an in-line fuse holder so if it should happen again, you can easily replace the fuse. If you do see a light or two come on at the indoor unit but the outdoor unit does not start after 3 or 4 minutes, sounds like you will need to call a technician. Most likely you have a blown fuse on the main PC board of the outside unit. It is not an easy one to replace. Good Luck!
Posted on Sep 04, 2007
sounds like the compressor relay is stuck in the 'on' position .... hence the compressor will not turn off .... to fix it you will need to turn off the main power (unplug) and take off the front panel then look at the circuit board normally the largest relay on the board is the compressor relay ... sometimes you can snap off the cover or break it off at times and clean the contacts ,give it a little spray with some contact cleaner or lub like wd 40 and that should be it .... alternative to this is just changing the circuit board all together ....
Posted on May 19, 2009
Check your filters, dog hair and lack of maintenance will definitely burden the cooling mode of the Mr Slim units.
Posted on Aug 24, 2009
Could be a wiring problem or a lack of refrigerant. All you can do is professionally have the unit checked and serviced.
Hope this helps I take the time to answer your question so please rate me
Posted on Jun 28, 2010
mr Slim A control R407c & R410a systems.
P6 = indoor coil frost protection in cooling or indoor coil overheat protection in heating.
One of the 2 indoor coil sensors reads minus 15 deg C for 3 mins.
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!
Posted on Sep 23, 2010
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