Service manual

ESIE03–01 Error Codes: Outdoor Units
Part 3 – Troubleshooting 3–47
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3
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1
Troubleshooting To troubleshoot, proceed as follows:
Caution Be sure to turn off power switch before connecting or disconnecting the connector, or parts damage
may occur.
Check the connections of the low
pressure system.
Is the LPS
correctly connected to
the outdoor unit
PCB?
Connect correctly.
y Turn the power OFF and back
ON after 2 or 3 minutes.
y Check the continuity of the LPS
for control and safety.
Does this LPS have
continuity?
Replace LPS
without continuity.
3 minutes after start:
Tc(LP) < Ta indoor - 25 °C
set value 1 > LP > set value 2
Replace outdoor
unit PCB.
Faulty refrigerant
piping circuit.
No
Yes
No
Yes
No
Yes
Is the unit in
cooling mode?
Yes
No
Check low
pressure during
operation
Check low
pressure during
operation
3 minutes after start:
Tc(LP) < Ta outdoor - 15 °C
set value 1 > LP > set value 2
Replace outdoor
unit PCB.
Faulty refrigerant
piping circuit.
No
Yes
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