Toshiba MMD- AP0724H2UL, Service Manual

Page: 67 / 84

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Check code
Location
of
detection
Description System status
Error detection
condition(s)
Check items (locations) Main
remote
controller
Outdoor 7-segment display
Check code Sub-code
P13 P13 –
I/F Outdoor liquid
backflow
detection error All stop <During cooling operation>
When system is in cooling
operation, high pressure is
detected in follower unit that
has been turned off.
<During heating operation>
When system is in heating
operation, outdoor PMV 1 or
2 continuously registers
opening of 100p or less while
under SH control. • Check full-close operation
of outdoor PMV (1, 2, 4).
• Check for defect in Pd or
Ps sensor.
• Check gas balancing
circuit (SV2) for clogging.
• Check balance pipe.
• Check SV3B circuit for
clogging.
• Check defect in outdoor
P.C. board (I/F).
• Check capillary of oil
separator oil return circuit
for clogging.
• Check for leakage of check
valve in discharge pipe
convergent section.
P15 P15
01: TS condition I/F Gas
leakdetection
(TS1 condition) All stop Protective shutdown due to
sustained suction
temperature at or above
judgment criterion
for at least 10 minutes is
repeated four times or more.
<TS error judgment criterion>
In cooling operation:140°F(60°C)
In heatling operation:104°F(40°C)
• Check for insufficiency in
refrigerant quantity.
• Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check PMVs (PMV1, 2) for
clogging.
• Check resistance
characteristics of TS1
sensor.
• Check for defect in 4-way
valve.
• Check SV4 circuit for
leakage
02: TD condition I/F Gas leak
detection
(TD condition) All stop Protective shutdown due to
sustained discharge
temperature (TD1, TD2 or
TD3) at or above 226°F(108°C) • Check for insufficiency in
refrigerant quantity.
• Check PMVs (PMV 1, 2)
for clogging.
• Check resistance
characteristics of TD1, TD2
and TD3 sensors.
• Check indoor filter for
clogging.
• Check piping for clogging.
• Check SV4 circuit (for
leakage or coil installation
error).
P17 P17 –
I/F Discharge
temperature
TD2 error All stop Discharge temperature (TD2)
exceeds 239°F(115°C) • Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check outdoor PMVs
(PMV1, 2, 4) for clogging.
• Check resistance
characteristics of TD2
sensor.
• Check for defect in 4-way
valve.
• Check SV4 circuit for
leakage.
• Check SV4 circuit (for
wiring or installation error
involving SV41, SV42 and
SV43).
P18 P18 –
I/F Discharge
temperature
TD3 error All stop Discharge temperature (TD3)
exce • Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check outdoor PMVs
(PMV1, 2, 4) for clogging.
• Check resistance
characteristics of TD3
sensor.
• Check for defect in 4-way
valve.
• Check SV43 circuit for
leakage.
• Check SV4 circuit (for
wiring or installation error
involving SV41, SV42 and
SV43).
for at least 10 minutes is repeated
four times or more.
eds 239°F(115°C)