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Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC
Troubleshooting and repair:
6.5.3 E1 (Indoor and outdoor unit communication error)
Description: The indoor unit has not received feedback from the outdoor unit for 110 seconds, 4 consecuti-
ve times.
Recommended parts to prepare:
• Indoor PCB
• Outdoor PCB
• Reactor
Does a problem remain?
The unit is operating normally.
NO
YES
Check the outdoor wiring connection.
YES
YES
NO
NO
Is it normal
?
YES
Is the error resolved?
NO
NO
NO
Power off, then restart the unit after 2 minutes.
Measure Vs. (Vs is the voltage
between
S and
N of outdoor unit. Red pan-S, Black pan-N).
Is the voltage
moving alternately between
Positive and Negative?
The voltage moves alternately with
positive value.
The voltage is a
certain value.
Check the indoor wirin
g
connections.
Replace the indoor PCB.
Power on.
Replace the outdoor PCB
.
Is it normal
?
Is it normal
?
Check the reactor.
Replace the
reactor.
Replace the outdoor PCB.
Power on.
Is the error resolved?
Replace the indoor PCB
.
