Toshiba MCY-MHP0404HS-E Service Manual page 116

Check code
Outdoor 7-segment display
Main
remote
Check
Sub-code
controller
code
01: TS
condition
P15 P15
02: TD
condition
Detected
outdoor unit
No.
P19 P19
P20 P20 –
AMP Air Conditioning
Location
of Description System status
detection
I/F Gas All stop
leakdetection
(TS condition)
I/F Gas leak All stop
detection
(TD condition)
I/F 4-way valve All stop
reversing trouble
I/F Activation of All stop
high-pressure
protection
Check code detection
condition(s)
Protective shutdown due to
sustained suction
temperature at or above
judgment criterion
for at least 10 minutes is
repeated four times or more.
<TS failure judgment criterion>
In cooling operation: 60 °C
In heating operation: 40 °C
Protective shutdown due to
sustained discharge
temperature (TD) at or above
108 °C for at least 10 minutes
is repeated four times or
more.
Abnormal refrigerating cycle
data is collected during
heating operation.
PD sensor detects pressure
equal to or greater than 3.6
MPa.
115
125
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Check items (locations)
Check for insufficiency in
refrigerant quantity.
Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
Check outdoor PMV for
clogging.
Check resistance
characteristics of TS
sensor.
Check for trouble in 4-way
valve.
Check SV4, SV5 circuit for
leakage
Check for insufficiency in
refrigerant quantity.
Check outdoor PMV for
clogging.
Check resistance
characteristics of TD
sensor.
Check indoor filter for
clogging.
Check piping for clogging.
Check SV4 circuit (for
leakage or coil installation
trouble).
heck for trouble in main
body of 4-way valve.
Check for coil trouble 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 trouble
involving TE and TL
sensors.
Check for trouble in Pd
pressure sensor.
Check service valves (gas
side, liquid side) to confirm
full opening.
Check for trouble in outdoor
fan.
Check for trouble 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 trouble in outdoor
P.C. board (I/F).
Check for trouble in indoor
fan system (possible cause
of air flow reduction).
Check opening status of
indoor PMV.
Check indoor-outdoor
communication line for
wiring trouble.
Check for troubled operation
of check valve in discharge
pipe convergent section.
Check gas balancing SV4
valve circuit.
Check SV5 valve circuit.
Check for refrigerant
overcharging.