Toshiba MMD-AP0724H2UL Service Manual page 67

High static ducted type
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Check code
Outdoor 7-segment display
Main
remote
controller
Check code
Sub-code
P13
P13
01: TS condition
P15
P15
02: TD condition
P17
P17
P18
P18
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Location
of
Description
System status
detection
I/F
Outdoor liquid
All stop
backflow
detection error
I/F
Gas
All stop
leakdetection
(TS1 condition)
I/F
Gas leak
All stop
detection
(TD condition)
I/F
Discharge
All stop
temperature
TD2 error
I/F
Discharge
All stop
temperature
TD3 error
– 67 –
Error detection
Check items (locations)
condition(s)
<During cooling operation>
• Check full-close operation
When system is in cooling
of outdoor PMV (1, 2, 4).
operation, high pressure is
• Check for defect in Pd or
detected in follower unit that
Ps sensor.
has been turned off.
• Check gas balancing
<During heating operation>
circuit (SV2) for clogging.
When system is in heating
• Check balance pipe.
operation, outdoor PMV 1 or
• Check SV3B circuit for
2 continuously registers
clogging.
opening of 100p or less while
• Check defect in outdoor
under SH control.
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.
Protective shutdown due to
• Check for insufficiency in
sustained suction
refrigerant quantity.
temperature at or above
• Check outdoor service
judgment criterion
valves (gas side, liquid
for at least 10 minutes is
side) to confirm full
repeated four times or more.
opening.
<TS error judgment criterion>
• Check PMVs (PMV1, 2) for
In cooling operation:140°F(60°C)
clogging.
In heatling operation:104°F(40°C)
• Check resistance
characteristics of TS1
sensor.
• Check for defect in 4-way
valve.
• Check SV4 circuit for
leakage
Protective shutdown due to
• Check for insufficiency in
sustained discharge
refrigerant quantity.
temperature (TD1, TD2 or
• Check PMVs (PMV 1, 2)
TD3) at or above 226°F(108°C)
for clogging.
for at least 10 minutes is repeated
• Check resistance
characteristics of TD1, TD2
four times or more.
and TD3 sensors.
• Check indoor filter for
clogging.
• Check piping for clogging.
• Check SV4 circuit (for
leakage or coil installation
error).
Discharge temperature (TD2)
• Check outdoor service
exceeds 239°F(115°C)
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).
Discharge temperature (TD3)
• Check outdoor service
exce
eds 239°F(115°C)
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).

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