9
Faulty PCB
Troubleshooting and repair:
a)
Check the connection between temperature sensor and PCB.
b)
Measure the resistance of sensor, and compare it with appendix table.
c)
If above items are no problem, replace a new PCB.
2
.4.3 E6 (IDU) Zero-crossing detection fault
Description:
When PCB does not receive zero crossing signal feedback for 4 minutes or the zero
crossing signal time interval is abnormal.
Possible reason:
Wrong connection
Faulty PCB
Troubleshooting and repair:
a)
Check the wire connections one by one according to wiring diagram.
b)
Check power supply.
c)
Change a new indoor unit PCB.
2
.4.4 E7 (IDU) EEPROM error
Description:
Indoor PCB main chip does not receive feedback from EEPROM chip.
Possible reason:
Faulty indoor unit PCB
Troubleshooting and repair:
a)
Cut off the power supply and then repower on the unit after 3 minutes.
b)
If the error still occurs, change a new PCB.
2
.4.5 E8 (IDU) PG fan motor stall protection
Description:
When the indoor fan speed is below 300rpm or over 2100rpm for 50s, the unit will stop
and show E8 error.
Possible reason:
Wrong wires connection
Faulty fan assembly
Faulty fan motor
Faulty PCB
Troubleshooting and repair:
a)
Cut off the power supply and then repower on the unit after 3 minutes. If it still has problem, go
to next step.
