Are the service valves fully open?
YES
YES
YES
Is the electronic expansion valve
correctly connected?
Open the service valves.
Is the high pressure pressostat
(63H1) correctly connected?
Has the high pressure pressostat
(63H1) been activated?
Action.
NO
NO
NO
1. During cooling:
- Is the fan motor running?
- Is the air flow obstructed?
- Is the installation space
sufficient?
2. During heating:
- Is the indoor module’s sensor for
the evaporator correctly
connected?
- Is the filter clogged?
If the voltage supply to the outdoor unit is switched off and on too quickly, E40
may be displayed. This is normal.
Action.
NO
YES
YES
Is there 230 V on the switch CNW
on the control board (PWB1)
between the red and white
cables?
Defective control board - replace.
Check fuse (4A) and cable.
NO
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