Toshiba MMW-UP0271LQ-E Service Manual page 65

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
P13 P13 —
01: TS condition
P15 P15
02: TD condition
P17 P17 —
Detected
outdoor unit No.
P19 P19
Location
Description
of
detection
I/F Outdoor liquid
backflow
detection
trouble
I/F Gas leak
detection
(TS1 condition)
I/F Gas leak
detection
(TD condition)
I/F Discharge
temperature
TD2 trouble
I/F 4-way valve
reversing
trouble
Indoor unit (including Hot Water Module)
Check code detection
System status
condition(s)
All stop <During cooling operation>
When system is in cooling
operation, high pressure is
detected in the unit that
has been turned off.
<During heating operation>
When system is in heating
operation, low pressure is
detected to be high in unit
that has been turned off.
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 trouble judgment criterion>
In cooling operation: 60 ˚C
In heating operation: 40 ˚C
All stop Protective shutdown due to
sustained discharge
temperature (TD1 or TD2)
at or above 108 ˚C for at
least 10 minutes is repeated
four times or more.
All stop Discharge temperature
(TD2) exceeds 115 ˚C.
All stop Abnormal refrigerating cycle
data is collected during
heating operation.
– 65 –
Check items (locations)
• Check full-close operation
of outdoor PMV (1, 2, 3, 4).
• Check for failure in Pd or
Ps sensor.
• Check failure 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
• Check for insufficiency in
refrigerant quantity.
• Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check PMVs (PMV1, 2, 3,
4) for clogging.
• Check resistance
characteristics of TS1
sensor.
• Check for failure in 4-way
valve.
• Check SV4 circuit for
leakage
• Check for insufficiency in
refrigerant quantity.
• Check PMVs (PMV 1, 2, 3,
4) for clogging.
• Check resistance
characteristics of TD1 and
TD2 sensors.
• Check indoor filter for
clogging.
• Check piping for clogging.
• Check SV4 circuit (for
leakage or coil installation
trouble).
• Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check outdoor PMVs
(PMV1, 2, 3, 4) for
clogging.
• Check resistance
characteristics of TD2
sensor.
• Check for failure in 4-way
valve.
• Check SV4 circuit for
leakage.
• Check SV4 circuit (for
wiring or installation trouble
involving SV41 and SV42).
• Check for failure in main
body of 4-way valve.
• Check for coil failure in 4-
way valve and loose
connection of its connector.
• Check resistance
characteristics of TS1 and
TE1,TE2 sensors.
• Check output voltage
characteristics of Pd and
Ps pressure sensors.
• Check for wiring trouble
involving TE1 and TL1
sensors.