Carrier 40GVC Installation Instructions Manual page 15

Malfunction
Indoor PCB Malfunction
Anti--- freeze Protection
System overload protection
Indoor motor malfunction
Indoor pipe temperature sensor malfunction
Return air temperature sensor malfunction
Indoor board malfunction
Compressor overload protection
Compressor start--- up failure
Outdoor fan motor failure
Low voltage protection
4--- way valve malfunction
Compressor phase detection error
Compressor speed reduction
Current detection malfunction
Outdoor ambient temperature sensor mal-
function
Discharge temperature sensor malfunction
(out of range)
Discharge temperature sensor malfunction
(open or shorted)
Condenser temperature sensor malfunction
(open or shorted)
Heat sink over temperature
DC over--- current
Heat sink temperature sensor malfunction
Low charge
DC input voltage is too high
DC input voltage is too low
Communication malfunction
Indoor and outdoor unit mismatched
TROUBLESHOOTING (CONTINUED)
Diagnostic Codes
38/40GVC/Q 12K, 230v
Error Code on in-
door unit
EE
E2
H4
H6
F2
F1
UF
H3
Lc
UH
E5
U7
U1
H7
U5
F3
E4
F5
F4
P8
H5
P7
F0
PH
PL
E6
UA
Repair Method/Cause
Replace indoor main board
Outdoor ambient temperature is too low
Check for dirty or blocked heat exchangers
Check motor mounting and wiring
Measure the resistance value in the sensor
Measure the resistance value in the sensor
Replace indoor main board
Check overload wiring
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.
Check outdoor motor
Check incoming power
Replace 4--- way valve
Replace outdoor main board
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.
Replace outdoor main board
Measure the resistance value in the sensor
Measure the resistance value in the sensor
Measure the resistance value in the sensor
Measure the resistance value in the sensor
Is outdoor ambient temperature out of system operating range?
Is heat sink blocked or damaged?
--- ---
Replace outdoor main board
Check for leaks
Check incoming power supply
Check incoming power supply
Check wiring connection
Check system combination
15