Toshiba MMW-UP0271LQ-E - Page 65

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Check code
Location
of
detection
Description System status
Check code detection
condition(s)
Check items (locations)
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
• 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).
Discharge
temperature
TD2 trouble
I/F All stop Discharge temperature
(TD2) exceeds 115 ˚C.
P17 P17 —
• 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.
4-way valve
reversing
trouble
I/FDetected
outdoor unit No.
All stop Abnormal refrigerating cycle
data is collected during
heating operation.
P19 P19
• 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
Outdoor liquid
backflow
detection
trouble
I/F 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.
P13 P13 —
• 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
Gas leak
detection
(TS1 condition)
I/F01: TS condition 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
P15 P15
• 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).
Gas leak
detection
(TD condition)
I/F02: TD condition 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.
Indoor unit (including Hot Water Module)