Toshiba MMD-UP0481HFP-UL Service Manual page 76

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
Detected indoor
address
P10 P10
P11 — —
P12 — —
P13 P13 —
01: TS condition
P15 P15
02: TD condition
Location
Description System status
of
detection
Indoor unit Indoor overflow All stop
trouble
I/F Outdoor heat All stop
exchanger
freeze trouble
Indoor unit Indoor fan Stop of
motor trouble corresponding
unit
I/F Outdoor liquid All stop
backflow
detection
trouble
I/F Gas leak All stop
detection
(TS1 condition)
I/F Gas leak All stop
detection
(TD condition)
- 76 -
Check code detection
Check items (locations)
condition(s)
• Float switch operates. • Check float switch
• Float switch circuit is connector.
open-circuited or • Check operation of drain
disconnected at connector. pump.
• Check drain pump circuit.
• Check drain pipe for
clogging.
• Check for failure in indoor
P.C. board.
• Check shortage of
• Outdoor heat exchanger
remaining frost detection refrigerant.
has occurred eight times • Check connection of TE1,
or more due to abnormal TE2 and TE3 sensors.
frost formation in heating • Check resistance
operation. characteristics of TE1,
TE2, and TE3 sensors.
• Check disconnection of
TS1 sensor.
• Check resistance
characteristics of TS1
sensor.
• Check outdoor I/F P.C.
board malfunction.
• Check operation of 4 way
valve.
• Check operation of outdoor
PMV (1, 2, 3).
• Check short circuit from
outlet air to inlet air.
• Motor speed • Check connection of fan
measurements connector and wiring.
• Check for failure in fan
continuously
deviate from target motor.
value. • Check for failure in indoor
• Overcurrent P.C. board.
protection is • Check impact of outside air
activated. treatment (OA).
<During cooling operation> • Check full-close operation
When system is in cooling of outdoor PMV (1, 2, 3, 4).
operation, high pressure is • Check for failure in Pd or
detected in the unit that Ps sensor.
has been turned off. • Check failure in outdoor
P.C. board (I/F).
<During heating operation> • Check capillary of oil
When system is in heating separator oil return circuit
operation, low pressure is for clogging.
detected to be high in unit • Check for leakage of check
that has been turned off. valve in discharge pipe
Protective shutdown due to • Check for insufficiency in
sustained suction refrigerant quantity.
• Check outdoor service
temperature at or above
judgment criterion valves (gas side, liquid
for at least 10 minutes is side) to confirm full
repeated four times or more. opening.
<TS trouble judgment criterion>
• Check PMVs (PMV1, 2, 3,
In cooling operation: 60 ˚C 4) for clogging.
In heating operation: 40 ˚C • Check resistance
characteristics of TS1
sensor.
• Check for failure in 4-way
valve.
• Check SV4 circuit for
leakage
Protective shutdown due to • Check for insufficiency in
sustained discharge refrigerant quantity.
temperature (TD1 or TD2) • Check PMVs (PMV 1, 2, 3,
at or above 108 ˚C for at 4) for clogging.
least 10 minutes is repeated • Check resistance
four times or more. characteristics of TD1 and
TD2 sensors.
• Check indoor filter for
clogging.
• Check piping for clogging.
• Check SV4 circuit (for
leakage or coil installation
trouble).