Fault analysis
No
No
Yes
Yes
No
Yes
No
Yes
Is the resistance of the
vaporise sensor OK?
(white cable)
(Table 1 P92-94)?
No
Replace temperature
sensor
Replace indoor unit
main board
Yes
Note:
The room temperature sensor and vaporiser sensor
are brought together in a single connector, CN9
1. Operation light flashes at 5 Hz: fault on the
room temperature sensor
3. Timer light flashes at 5 Hz: communication
error between indoor unit and outdoor component
Establish the power
supply.
Is there voltage in the
indoor unit?
Is the connecting cable
shielded, and is it
earthed?
Use a shielded,
earthed cable
Is the cable connecting
the indoor unit and
outdoor component
properly connected?
Connect the cable
properly.
Is the cable connecting
the indoor unit and
outdoor component
damaged?
Replace the cable.
Replace the main board
for the indoor unit or
outdoor component
Is the resistance of the
temperature sensor OK?
(black cable)
(Table 1 P92-94)?
No
Replace temperature
sensor
Replace indoor unit
main board
Yes
2. Defrost light flashes at 5 Hz: fault on the
vaporiser sensor
No
Yes
Yes
Yes
4. Alarm light flashes at 5 Hz: float switch /
condensation pump
Replace float switch.
Error still exists?
Set the cooling mode
on the indoor unit and
run the system so a
few minutes.
If the error still exist?
Is the float switch
working properly?
Check the condensate
drain, whether it is
bent if necessary.
If the condensate drain
okay?
Replace the main board
for the indoor unit
Is the resistance of the
room sensor OK?
(Table 1 P92-94)?
Yes
No
Replace temperature
sensor
No
Condensate pump
exchange. Error still
exists?
Does the condensate
pump properly
appropriate?
Yes
No
Condensate drain
renew or repair
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