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Page 30
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:
NOTICE
Check the above items and take appropriate corrective measures. If the unit continues to function
improperly, immediately disconnect power and contact the MRCOOL
®
technical department, at (270)
366 - 0457, or your installation dealer.
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.
Connect it to the power supply.
Check the circuit voltage is
within specified range.
Replace fuse or reconnect circuit
breaker.
Remove obstacles.
Adjust thermostat temperature
setting.
Close the door or windows.
Draw curtain or louver.
Reduce other heat sources.
Clean the filter.
Air inlet and outlet of the units are
blocked.
Air inlet and outlet of the units are
blocked.
Filter screen is blocked by dirt.
Other heat sources in the room.
Doors or windows are opened.
Rooms exposed to excessive direct
sunshine.
Improper temperature setting.
Clear any obstacles and ensure the
area remains well ventilated.
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