Toshiba MMY-MAP0726FT2P-UL - Page 160

Check code
Location
of
detection
Description System status
Check code detection
condition(s)
Check items (locations)
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
P19 P19
Detected outdoor unit No. I/F 4-way valve
reversing
trouble
All stop Abnormal refrigerating cycle
data is collected during
heating operation.
• Check for trouble in main
body of 4-way valve.
•
•
Check for coil trouble in
4-way valve and loose
connection of its
connector.
Check resistance
characteristics of TS1
and TE1,TE2 sensors.
• Check output voltage
characteristics of P and
Ps pressure sensors.
• Check for wiring trouble
involving TE1 and TL1
sensors.
P20 P20
–
I/F Activation of
high-pressure
protection
All stop
<During cooling operation>
PD sensor detects pressure
equal to or greater than
558.25psi (3.85 MPa).
<During heating operation>
PD sensor detects pressure
equal to or greater than
552psi (3.6 MPa).
• Check for trouble in PD
pressure sensor.
• Check service valves (gas
side, liquid side) to confirm
full opening.
• Check for trouble in
outdoor fan.
• Check for trouble 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 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.
• Check for SV15 for
clogging.
• Check stuck in the check
valve of the circuit which
by passes the main heat
exchanger and sub heat
exchanger.
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