Omega OTEC IEWB Series - E6 (IDU) Zero-Crossing Detection Fault; E7 (IDU) EEPROM Error; E8 (IDU) PG Fan Motor Stall Protection

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.