Toshiba MMD-AP0726HP-UL Service Manual page 70

Check code
Outdoor 7-segment display
Main
remote
Check
Sub-code
control
code
P13 P13 –
01: TS condition
P15 P15
02: TD condition
P17 P17 –
Location
of Description System status
detection
I/F Outdoor liquid All stop
backflow
detection trouble
I/F Gas All stop
leakdetection
(TS1 condition)
I/F Gas leak All stop
detection
(TD condition)
I/F Discharge All stop
temperature
TD2 trouble
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Trouble detection
Check items (locations)
condition(s)
<During cooling operation> • Check full-close operation
When system is in cooling
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
3 continuously registers
clogging.
opening of 300p or less
• Check defect in outdoor
while under superheat
P.C. board (I/F).
control. • 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 trouble judgment • Check PMVs (PMV1, 3) for
criterion> In cooling clogging.
operation: 140°F(60°C) In
• Check resistance
heating operation: 104°F
characteristics of TS1
(40°C)
sensor.
• Check for defect in 4-way
valve.
• Check SV4 circuit for
leakage
Protective shutdown due to • Check for insufficiency in
refrigerant quantity.
sustained discharge
• Check PMVs (PMV 1, 3)
temperature (TD1 or TD2)
at or above 226.4°F(108°C)
for clogging.
for at least 10 minutes is • Check resistance
repeated four times or characteristics of TD1 and
TD2 sensors.
more.
• Check indoor filter for
clogging.
• Check piping for clogging.
• Check SV4 circuit (for
leakage or coil installation
trouble).
Discharge temperature • Check outdoor service
(TD2) exceeds valves (gas side, liquid
239°F(115°C)
side) to confirm full
opening.
• Check outdoor PMVs
(PMV1, 3, 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
trouble involving SV41
and SV42).
of outdoor PMV (1, 3, 4).