Toshiba MCY-MHP0305HT-C Service Manual page 104

Check code
Location
Outdoor 7-segment display
Main
remote detection
Check
Sub-code
controller
code
01: TS I/F
condition
P15 P15
02: TD I/F
condition
Detected I/F
outdoor unit
No.
P19 P19
I/F
P20 P20 –
of Description System status
Gas All stop
leakdetection
(TS condition)
Gas leak All stop
detection
(TD condition)
4-way valve All stop
reversing error
Activation of All stop
high-pressure
protection
103
125
Error detection
Check items (locations)
condition(s)
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 outdoor PMV for
In cooling operation: 60 °C clogging.
In heating operation: 40 °C Check resistance
characteristics of TS
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 (TD) at or above Check outdoor PMV for
108 °C for at least 10 minutes clogging.
is repeated four times or Check resistance
more. characteristics of TD
sensor.
Check indoor filter for
clogging.
Check piping for clogging.
Check SV4 circuit (for
leakage or coil installation
error).
Abnormal refrigerating cycle Check for defect in main
data is collected during body of 4-way valve.
heating operation. Check for coil defect in 4-
way valve and loose
connection of its
connector.
Check resistance
characteristics of TS and
TE sensors.
Check output voltage
characteristics of Pd and
Ps pressure sensors.
Check for wiring error
involving TE and TL
sensors.
Pd sensor detects pressure Check for defect in Pd
equal to or greater than 3.6 pressure sensor.
MPa. Check service valves (gas
side, liquid side) to confirm
full opening.
Check for defect in outdoor
fan.
Check for defect in outdoor
fan motor.
Check outdoor PMV for
clogging.
Check indoor / outdoor
heat exchangers for
clogging.
Check for short-circuiting
of outdoor suction /
discharge air flows.
Check SV2 circuit for
clogging.
Check for defect in outdoor
P.C. board (I/F).
Check for defect in indoor
fan system (possible cause
of air flow reduction).
Check opening status of
indoor PMV.
Check indoor-outdoor
communication line for
wiring error.
Check for faulty operation
of check valve in discharge
pipe convergent section.
Check gas balancing SV4
valve circuit.
Check for refrigerant
overcharging.