Toshiba MMY-SAP0806HT8P-E Service Manual page 150

Check code
Outdoor 7-segment display
Main
remote
Check
Sub-code
controller
code
Detected outdoor unit No.
P19 P19
P20 P20 –
Location
of Description System status
detection
I/F 4-way valve All stop
reversing
trouble
I/F Activation of All stop
high-pressure
protection
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Check code detection
Check items (locations)
condition(s)
• Check for trouble in main
Abnormal refrigerating cycle
data is collected during body of 4-way valve.
Check for coil trouble in
heating operation. •
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 trouble
involving TE1 and TL1
sensors.
<During cooling operation>
• Check for defect in PD
PD sensor detects pressure
pressure sensor.
equal to or greater than
• Check service valves (gas
3.85 MPa.
side, liquid side) to confirm
<During heating operation>
full opening.
PD sensor detects pressure
• Check for trouble in outdoor
equal to or greater than 3.6
fan.
MPa. • Check for trouble in outdoor
fan motor.
• Check outdoor PMV
(PMV1,4) 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 trouble in outdoor
P.C. board (I/F).
• Check for trouble 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 trouble operation
of check valve in discharge
pipe convergent section.
• Check gas balancing SV4
valve circuit.
• Check SV5 valve circuit.
• Check for refrigerant
overcharging.