Toshiba MMW-AP0271LQ-E Service Manual page 57

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
P12 — —
P13 P13 —
01: TS condition
P15 P15
02: TD condition
P17 P17 —
Location
Description
of
detection
Indoor unit Indoor fan
motor error
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
Error detection
System status
condition(s)
Stop of • Motor speed
corresponding unit measurements
continuously
deviate from target value.
• Overcurrent protection is
activated.
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: 60 ˚C
In heating operation: 40 ˚C
All stop Protective shutdown due to
sustained discharge
temperature (TD1, TD2 or
TD3) at or above 108 ˚C for
at least 10 minutes is
repeated four times or more.
All stop Discharge temperature
(TD2) exceeds 115 ˚C.
– 57 –
Indoor unit (including Hot Water Module)
Check items (locations)
• Check connection of fan
connector and wiring.
• Check for defect in fan
motor.
• Check for defect in indoor
P.C. board.
• Check impact of outside air
treatment (OA).
• 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).