Carrier 38QHC009D8S Series, Service Manual

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38
10.2.2
Indoor / outdoor unit’s communication diagnosis and solution(E1)
Error Code
E1
Malfunction decision
conditions
Indoor unit does not receive the feedback from outdoor unit during
110 seconds and this condition happens four times continuously.
Supposed causes
●
Wiring mistake
●
Indoor or outdoor PCB faulty
Trouble shooting:
Measure Vs. Is the voltage moving
alternately as positive values and
negative values?
(Vs is the voltage between S and N of
outdoor unit. Red pan-S, Black pan-N)
Measure Vs. Is the voltage moving
alternately as positive values and
negative values?
(Vs is the voltage between S and N of
outdoor unit. Red pan-S, Black pan-N)
If the voltage has always been the positive value
Power off, then restart the unit 2 minutes later
Power off, then restart the unit 2 minutes later
If the voltage is a fixed value
Replace the outdoor main PCB.
Power on. Is the error
extinguished?
Replace the outdoor main PCB.
Power on. Is the error
extinguished?
Check the outdoor wiring connection
Check the outdoor wiring connection
Replace the indoor main PCB.
Power on. Is the error
extinguished?
Replace the indoor main PCB.
Power on. Is the error
extinguished?
Yes
Replace the outdoor main PCB.
Replace the outdoor main PCB.
No
Replace the indoor main PCB.
Replace the indoor main PCB.
No
Check the indoor wiring connection
Check the indoor wiring connection
Yes
Yes
Check whether reactor
is normal?
Check whether reactor
is normal?
Yes
Replace the reactor
Replace the reactor No