MITSUBISHI ELECTRIC PE-15MYC - Manual (Page 108)

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7.Trouble shooting
Before you ask for repair service, check the following points:
State of Machine
Cool or warm air does not come out.
Cause
Air flows out but it does not cool or heat
enough.
It does not run.
Troubleshooting
Improper temperature adjustment.
The earth leakage breaker is gone.
The fuse in the power supply is gone.
The power supply is turned OFF.
Power failure.
The restart-preventing circuit is in operation for
3 minutes.
Windows and doors are open.
There are some obstacles at the air inlet and
outlet of the units.
The filter is filled with dust and dirt.
Turn the power supply ON.
Press the [ON/OFF] button after power restoration.
Close.
Remove.
Clean up the filter.
After checking the set temperature.
Put in the earth leakage breaker.
Replace fuse.
Wait for a while.
(To protect the compressor, a 3-minute restart-
preventing circuit is built into the unit.
Therefore, there are occasions sometimes when
the compressor does not start running immediately.
There are cases when it does not run for as long
as 3 minutes.)
Fan runs but compressor do not run.
The set temperature of thermostat is
excessively high for cooling.
excessively low for heating. (PEH only) For temperature control,
decrease the set temperature at cooling.
increase the set temperature at heating. (PEH only)
The room temperature is
excessively low for cooling.
excessively high for heating. (PEH only) Can not be operated as it is out of temperature
control range.
Fan runs but stops immediately. Air outlet and inlet are blocked. Remove blocking matter.
Fogged white steam is discharged from
the indoor unit. When the indoor temperature and humidity are
high, such a phenomenon is occasionally had
at the beginning of system operation. It is not a breakdown.
Please use as it is.
Water or steam is discharged from the
outdoor unit. At cooling, water which places to cooling piping
and piping connection part drops.
When heating, water which places to the heat
exchanger drops. (PEH only) It is not a breakdown.
Please use as it is.
Insufficient refrigerant charge. Contact with your installing contractor.
Indoor unit operation was started anew during
the heating and defrosting operation.
(5 10 HP only) Wait for a while.
(Heating operation starts after ending defrosting
operation.)
On heating, the air flow stops although a set
temperature is not reached. (PEH only) Frost adheres to the outdoor coil when the
temperature on the outside is low and humidity
is high. This frost is melted. It is not a breakdown.
Please use as it is.