Daikin Sky Air R-407C Service Manual page 272

Error Codes: Outdoor Units
1
Troubleshooting
3 3
4
5
3–42
To troubleshoot, proceed as follows:
Check the connections of the low
pressure system.
Is the LPS
correctly connected to
the outdoor unit
PCB?
Yes
Ÿ
Turn the power OFF and back
ON after 2 or 3 minutes.
Ÿ
Check the continuity of the LPS
for control and safety.
Does this LPS have
continuity?
Yes
Is the unit in
cooling mode?
Yes
Check low
pressure during
operation
3 minutes after start:
Tc(LP) < Ta indoor - 25°C
set value 1 > LP > set value 2
Yes
Faulty refrigerant
piping circuit.
No Connect correctly.
Replace LPS
No
without continuity.
Check low
No pressure during
operation
3 minutes after start:
Tc(LP) < Ta outdoor - 15°C
set value 1 > LP > set value 2
Yes
Faulty refrigerant
piping circuit.
Replace outdoor
No
unit PCB.
Tc(LP) = heat exchanger temp.
Ta indoor = indoor air temp.
Ta outdoor = outdoor air temp.
LP = low pressure
set value 1 = max. pressure
set value 2 = min. pressure
Refer to low pressure settings
ESIE02–01
Replace outdoor
No
unit PCB.
Part 3 – Troubleshooting