14
TROUBLESHOOTING
This unit has on--board diagnostics. Error codes will appear on the LED display on the front panel of the indoor unit in place of the
temperature display. Error codes are also displayed on the outdoor unit microprocessor board with colored LED lights. The table below
explains the error codes for both units.
Diagnostic Codes
38/40GVC/Q 9k / 12k, 115v
Malfunction
Error Code
on indoor unit
Repair Method/Cause
Indoor PCB Malfunction EE Replace indoor main board
Anti--- freeze Protection E2 Outdoor ambient temperature is too low
System overload protection H4 Check for dirty or blocked heat exchangers
Indoor motor malfunction H6 Check motor mounting and wiring
Indoor pipe temperature sensor malfunction F2 Measure the resistance value in the sensor
Return air temperature sensor malfunction F1 Measure the resistance value in the sensor
Indoor board malfunction UF Replace indoor main board
Compressor overload protection H3 Check overload wiring
Compressor start---up failure Lc
Check if the resistance of the compressor and the resistance to
ground is normal. If the resistance is normal, the outdoor main
board may be defective.
Outdoor fan motor failure UH Check outdoor motor
Low voltage protection E5 Check incoming power
4 --- w a y v a l v e m a l f u n c t i o n U7 Replace 4--- way valve
Compressor phase detection error U1 Replace outdoor main board
Compressor speed reduction H7
Check if the resistance of the compressor and the resistance to
ground is normal. If the resistance is normal, the outdoor main
board may be defective.
Current detection malfunction U5 Replace outdoor main board
Outdoor ambient temperature sensor
malfunction
F3 Measure the resistance value in the sensor
Discharge temperature sensor malfunction
(out of range)
E4 Measure the resistance value in the sensor
Discharge temperature sensor malfunction
(open or shorted)
F5 Measure the resistance value in the sensor
Condenser temperature sensor malfunction
(open or shorted)
F4 Measure the resistance value in the sensor
Heat sink over---temperature P8
Is outdoor ambient temperature out of system operating range?
Is heat sink blocked or damaged?
D C o v e r --- c u r r e n t UU --- ---
Heat sink temperature sensor malfunction P7 Replace outdoor main board
Low charge F0 Check for leaks
DC input voltage is too high PH Check incoming power supply
DC input voltage is too low PL Check incoming power supply
Communication malfunction E6 Check wiring connection
Indoor and outdoor unit mismatched UA Check system combination
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