– 83 –
FILE NO. SVM-
16041
P19
P19
Detected
outdoor unit
No.
I/F
4-way valve
reversing error
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 sensors.
Check output voltage
characteristics of Pd and
Ps pressure sensors.
Check for wiring error
involving TE1 and TL
sensors.
P20
P20
I/F
Activation of
high-pressure
protection
All stop
Pd sensor detects pressure
equal to or greater than
3.6 MPa.
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 PMVs
(PMV1, 2, 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 error.
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.
Check code
Location
of
detection
Description
System status
Error detection
condition(s)
Check items (locations)
Outdoor 7-segment display
Sub-code
Check
code
Main
remote
controller
