E6 (Idu) Zero-Crossing Detection Fault; E7 (Idu) Eeprom Error; E8 (Idu) Pg Fan Motor Stall Protection - Omega OTEC IEWB Series Service Manual

 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.
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