Toshiba A03-009, Service Manual

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93
Check code
Location
of
detection
Description System status
Error detection
condition(s)
Check items (locations)
Main
remote
controller
Outdoor 7-segment display
AI-NET central
control
remote
controller
Check
code
Sub-code
P19 P19
Detected
outdoor unit
No.
8
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 – 22
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.