Check code
Location
of
detection
Description
System status
Trouble
detection
condition(s)
Check items (locations)
Main
remote
control
Outdoor 7-segment display
Check
code
Sub-code
P1
9
P1
9
Detected outdoor unit No.
I/F
4-way valve
reversing
trouble
All stop
Abnormal refrigerating cycle
data is collected during
heating operation.
• Check for defect in main
body of 4-way valve.
• Check for coil defect in 4-
way valve and loose
connection of its
connector.
• Check resistance
characteristics of TS1
and TE1
,TE2
sensors.
• Check output voltage
characteristics of Pd and
Ps pressure sensors.
• Check for wiring
trouble
involving TE1 and TL
1
sensors.
P
20
P
20
–
I/F
Activation of
high-pressure
protection
All stop
<During cooling operation>
Pd sensor detects pressure
equal to or greater than
558psi (3.85MPa)
<During heating operation>
Pd sensor detects pressure
equal to or greater than
522psi (3.6MPa)
• Check for defect in Pd
pressure sensor.
• Check 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
(PMV1,
3
, 4) 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 defect in indoor
fan system (possible cause
of air flow reduction).
• Check opening status of
indoor PMV.
• Check indoor-outdoor
communication line
for wiring
trouble
.
• Check for faulty operation
of check valve in discharge
pipe convergent section.
• Check gas balancing SV4
valve circuit.
• Check SV5 valve circuit.
• Check for refrigerant
overcharging.
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