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mrcool.com
Outdoor Unit Installation
Maintenance
4
4
Troubleshooting
(1) If your air conditioner fails to function normally, check the following items before conducting
maintenance:
Problem Cause Corrective Measure
The unit
will not activate.
Abnormal cooling
or heating.
The unit operates
but stops
immediately.
The unit is not connected to a power
supply.
Low voltage.
Fuse broken or circuit breaker trips o.
Connect to power supply.
Check the circuit voltage is within
rated scope.
Replace fuse or reconnect breaker.
Remove obstacles.
Adjust setting at thermostat.
Close the door or windows.
Draw curtain or louver.
Reduce heat source.
Clean the lter.
Air inlet and outlet of the units have
been blocked.
Air inlet and outlet of the units have
been blocked.
Filter screen is blocked by dirt.
Too much heat source in the room.
Doors or windows are opened.
Direct sunshine.
Inappropriate temperature setting.
Clear any obstacles and keep the area
well ventilated.
NOTICE
Check the above items and take appropriate corrective measures. If the unit continues to
function improperly, immediatey disconnect power and contact MRCOOL or your installation
dealer.
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