Troubleshooting Sheet

1.3.2 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 between
-25
V to 25
V
?
Measure Vs
. Is the voltage moving
alternately between
-25
V to 25
V
?
Yes
Power off,
then restart the unit 2
minutes
later.
Is the error extinguished?
Power off
, then restart the unit
2
minutes
later.
Is the error extinguished?
No
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
。
Is the wiring
correctly?
Check the outdoor wiring connection。
Is the wiring correctly
?
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
。
Is the wiring
correctly?
Check the indoor wiring connection
。
Is the wiring correctly?
Yes
No
Check whether reactor
is normal
?
Check w
hether rea
ctor
is normal?
Yes
Replace
the reactor
Replace
the reactor
No