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Indoor unit evaporator temperature (T2 or T2B)
Outdoor unit running frequency
Outdoor unit condenser temperature (T3)
Outdoor ambient temperature (T4)
Indoor unit fan speed (f0 means 1500rpm, a1 means 1010rpm)
2.4 Troubleshooting by error code
Indoor unit error
2.4.1 E1 (IDU) Communication failure between indoor and outdoor unit
Description: the indoor unit didn’t receive feedback from outdoor unit within 1 minute.
Possible reason:
Bad connection of communication wire
Fault indoor or outdoor unit PCB
Troubleshooting and repair:
a) Check if the wiring connection between outdoor and indoor unit is loose.
b) Power off and then repower on the unit after 3 minutes. If error code disappear, problem is solved.
If not, go to next step.
c) Measure the DC voltage between P and N on back of the main PCB with multi meter.
2.4.2 E2, E3, E4 (IDU) temperature sensor fault
Description: the sampling voltage is lower than 0.06V or higher than 4.94V.
Possible reason:
Open circuit or short circuit of relevant port.
Faulty temperature sensor
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