Toshiba MMU-AP0072H2UL Service Manual page 99

Check code
Outdoor 7-segment display
Main
remote
Check code Sub-code
controller
P13 P13
01: TS condition
P15 P15
02: TD condition
P17 P17
P18 P18
Location
of Description
detection
I/F Outdoor liquid
backflow
detection error
–
I/F Gas
leakdetection
(TS1 condition)
I/F Gas leak
detection
(TD condition)
I/F Discharge
temperature
TD2 error
–
I/F Discharge
temperature
TD3 error
–
Error detection
System status
condition(s)
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.
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)
All stop Protective shutdown due to
sustained discharge
temperature (TD1, TD2 or
TD3) at or above 226°F(108°C)
for at least 10 minutes is repeated
four times or more.
All stop Discharge temperature (TD2)
exceeds 239°F(115°C)
All stop Discharge temperature (TD3)
exce eds 239°F(115°C)
99
Check items (locations)
• 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.
• 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
• 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).
• 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).
• 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).