MITSUBISHI ELECTRIC PRH-5 - Manual (Page 57)

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4. PREPARING FOR OPERATION AFTER PROLONGED SHUTDOWN
When the usage season starts, proceed with the following before starting operation:
(1)Clean the air filter.
(2)Do not use the unit immediately. Turn the main power switch on for a period of 3 hours before restarting
cooling / heating operation. This allows the compressors to come up to the correct operation temperatures.
Failure to do this, could cause compressor failure.
5.PREPARING FOR PROLONGED SHUTDOWN
After the usage season is over, prepare the air conditioner for later use by:
(1)Setting the power switch to OFF.
(2)Consulting your Air conditioning specialist for detailed information.
6.TROUBLESHOOTING
Note:
If the unit does not operate normally after troubleshooting, please contact your local equipment supplier or
air conditioning contractor.
Contact your
Air conditioning specialist.
For temperature control,
• decrease the set
temperature at cooling.
• increase the set
temperature at heating.
The set temperature of
thermostat is
• excessively high for
cooling.
• excessively low for
heating.
Runs but without
cooling/heating.
Insufficient
refrigerant charge.
Remove blocking matter. Air outlet and inlet
are blocked.
Close them. Windows and doors are
being opened.
Clean it. The filter installed in
the field is clogged
with dust.
Fan runs but stops
immediately.
Remove blocking matter. Air outlet and inlet
are blocked.
Fan runs but compressor
does not run.
Can not be operated as
it is out of temperature
control range. The room temperature is
• excessively low for
cooling.
• excessively high for
heating.
For temperature control,
• decrease the set
temperature at cooling.
• increase the set
temperature at heating.
The set temperature of
thermostat is
• excessively high for
cooling.
• excessively low for
heating.
Ask your electric power
company. Excessively low power
source voltage.
Contact your
Air conditioning specialist.
Blown fuse of power
source switch.
Wait for power supply
recovery.
Power failure.
Both fan and compressor
do not run.
Remedy Possible cause Symptom
If any trouble occurs, turn the operation (start or run) switch off immediately.