If other error codes are present, contact your dealer or qualied service technician.
If any of the following occurs, shut off the unit and contact your dealer or qualified service technician:
• Power cord overheats or becomes damaged
• If you notice a burning smell
• The unit trips the breaker panel or cycles off frequently without obtaining the set temperature
• Abnormal sound during operation
• If you notice water leakage
Error Codes Malfunction Type Possible Causes
H5
IPM Module Protection
1. Improper or low voltage at the IPM
module.
2. IPM module malfunction.
3. Compressor Malfunction.
H6
Indoor DC Fan Motor Malfunction
1. Loose connections between fan motor
and control board.
2. Fan motor or blower wheel bearings
malfunction.
3. Control board malfunction.
H7
Compressor De-Synchronized
Malfunction
1. Unbalanced compressor voltage.
2. Control board malfunction.
3. Compressor malfunction.
L3
Outdoor Fan Motor Malfunction
1. Loose connections between fan motor
and control board.
2. Fan motor malfunction.
3. Control board malfunction.
LP
Mismatched Indoor and Outdoor
Units
Indoor and outdoor units are non-
compatible.
P8
Module Temperature Protection
1. Lack of thermal grease on IPM module.
2. Heat sink (radiator) not tightly mounted.
3. Control board malfunction.
U4
Reversing Valve Malfunction
1. Reversing valve voltage is less than
175V.
2. Loose connections between reversing
valve and control board.
3. Reversing valve solenoid malfunction.
38 88-M4MHW17-1A-EN
Installer's Guide
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