
36
Troubleshooting
Guide
E c
OUTDOOR UNIT
AMBIENT
TEMPERATURE
SENSOR FAILURE
A. Connection location on outdoor unit main PCB is:
CN15
PO\PG\PQ
for 12kbtu/18kbtu/ 24kbtu/36kbtu, PO is for
outdoor ambient temperature sensor, PG is for outdoor fan
coil temperature sensor, PQ is for outdoor unit discharge
gas temperature sensor. Replace with new sensor; B. after
step A, if unit still displays error code Ec, change the
outdoor unit main PCB.
E E
DISCHARGE GAS
TEMPERATUREOR
COMPRESSOR
TEMPERATURE
OVERHEAT
PROTECTION
Check that the refrigerant charge is correct, if refrigerant
charge is low test system for leaks.
E F
OUTDOOR
CONDENSER
OVERHEAT IN
COOLING MODE
A. Check outdoor unit fan motor is operating;
B. Checking if unit is in the cooling mode while ambient
temperature is above the system operating range; C. Check
outdoor unit fan coil temperature.
P 1
SIGNAL
COMMUNICATION
BETWEEN
OUTDOOR UNIT
MAIN PCB AND
INVERTER
MODULAR BOARD
A. Check the wiring on outdoor unit main PCB is correct or
loose; B. If step A is passed, then change outdoor unit main
PCB; C. If step A does not pass, change outdoor unit
inverter modular board.
P 3
PROTECTION OF
OUTDOOR AMBIENT
TEMPERATURE TOO
LOW
A. Check if outdoor ambient temperature is far below the
system operating range, outdoor unit ambient temperature
sensor can not touch the outdoor unit fan coil; B. If outdoor
low ambient temperature is still within allowance, test or
replace the outdoor ambient temperature sensor; C. If step
B does not work and unit still has error code P3 displayed,
change the outdoor unit main PCB.
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