124
Location
of
detection
Description
System status
Error detection
condition(s)
Check items (locations)
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
Check code
• Check connection of
high-pressure SW
connector.
• Check for defect in Pd
pressure sensor.
• Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check for defect in
outdoor fan.
• Check for defect in
outdoor fan motor.
• Check outdoor PMV for
clogging.
• Check indoor/outdoor
heat exchangers for
clogging.
• Check for short-circuiting
of outdoor
suction/discharge air
flows.
• Check SV2 circuit for
clogging.
• Check for defect in
outdoor P.C. board (I/F).
• Check for error in indoor
fan system (possible
cause of air flow
reduction).
• Check opening status of
indoor PMV.
• Check indoor-outdoor
communication line for
wiring error.
• Check for faulty operation
of check valve in
discharge pipe conver-
gent section.
• Check gas balancing SV4
valve circuit.
• Check SV5 valve circuit.
• Check for refrigerant
overcharging.
High-pressure SW is
activated.
All stop
Activation of
high-pressure
SW
IPDU
P04
P04
112