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DIAGNOSIS AND SOLUTION (CONT)
E1 (Indoor and Outdoor Unit Communication Error)
Description: The indoor unit has not received feedback from the outdoor unit for 150 seconds, four consecutive times.
Recommended parts to prepare:
S Indoor PCB
S Outdoor PCB
S Reactor
Troubleshooting and Repair:
Power o , then restart the unit after 2 minutes.
Does a problem remain ? The unit is operating normallyNO
Measure Vs . ( Vs is the voltage between S and N of
outdoor unit. Red pan-S, Black pan-N)
YES
Is the voltage moving
alternately between positive and
negative?
Check the outdoor wiring connection .
Is it normal?
Check the reactor .
YES
Is it normal?
Replace the outdoor PCB .
Power on.
YES
Is the error
resolved?
Replace the indoor PCB .
NO
Replace the
reactor
NO
Check the indoor wiring
connections
Is it normal?
Replace the indoor PCB .
Power on.
YES
Is the error resolved ?
Replace the outdoor PCB .
NO
The voltage moves alternately with
positive value.
NO
The voltage is a
certain value
NO
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