Toshiba MMY-MAP0724HT6UL - Page 128

127
Check code
Location
of
detection
Description System status Error detection condition(s) Check items (locations)
Wired
remote
control
Outdoor 7-segment display
Check
code
Sub-code
P07 P07
01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side
IPDU
I/F
Heat sink
overheating
error
All stop Temperature sensor built into
IGBT (TH) is overheated.
• Check power supply voltage.
• Check outdoor fan system error.
• Check heat sink cooling duct for
clogging.
• Check IGBT and heat sink for
thermal performance for faulty
installation.
(e.g. mounting screws and
thermal conductivity)
• Check for defect in A3-IPDU.
(faulty IGBT built-in temperature
sensor (TH))
P10 P10
Detected indoor
address
Indoor
unit
Indoor overflow
error
All stop • Float switch operates.
• Float switch circuit is open-
circuited or disconnected at
connector.
• Check float switch connector.
• Check operation of drain pump.
• Check drain pump circuit.
• Check drain pipe for clogging.
• Check for defect in indoor P.C.
board.
P12 – –
Indoor
unit
Indoor fan motor
error
Stop of
corresponding
unit
• Motor speed measurements
continuously deviate from target
value.
• Overcurrent protection is
activated.
• Check connection of fan
connector and wiring.
• Check for defect in fan motor.
• Check for defect in indoor P.C.
board.
• Check impact of outside air
treatment (OA).
P13 P13 –
I/F Outdoor liquid
backflow
detection error
All stop <During cooling operation>
When system is in cooling
operation, high pressure is
detected in follower unit that has
been turned off.
<During heating operation>
When system is in heating
operation, outdoor PMV 1 or 2
continuously registers opening of
100p or less while under SH
control.
• Check full-close operation of
outdoor PMV (1, 2, 4).
• Check for defect in Pd or Ps
sensor.
• Check gas balancing circuit
(SV2) for clogging.
• Check balance pipe.
• Check SV3B circuit for clogging.
• Check defect 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 convergent
section.
P15 P15
01: TS condition I/F Gas
leakdetection
(TS1 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 error judgment criterion>
In cooling operation: 140 °F (60
°C)
In heating operation: 104 °F (40
°C)
• Check for insufficiency in
refrigerant quantity.
• Check outdoor service valves
(gas side, liquid side) to confirm
full opening.
• Check PMVs (PMV1, 2) for
clogging.
• Check resistance characteristics
of TS1 sensor.
• Check for defect in 4-way valve.
• Check SV4 circuit for leakage
02: TD condition I/F Gas leak
detection
(TD condition)
All stop Protective shutdown due to
sustained discharge temperature
(TD1, TD2 or TD3) at or above
226.4 °F (108 °C) for at least 10
minutes is repeated four times or
more.
• Check for insufficiency in
refrigerant quantity.
• Check PMVs (PMV 1, 2) for
clogging.
• Check resistance characteristics
of TD1, TD2 and TD3 sensors.
• Check indoor filter for clogging.
• Check piping for clogging.
• Check SV4 circuit (for leakage or
coil installation error).
P17 P17 –
I/F Discharge
temperature
TD2 error
All stop Discharge temperature (TD2)
exceeds 239 °F (115 °C).
• Check outdoor service valves
(gas side, liquid side) to confirm
full opening.
• Check outdoor PMVs (PMV1, 2,
4) for clogging.
• Check resistance characteristics
of TD2 sensor.
• Check for defect in 4-way valve.
• Check SV4 circuit for leakage.
• Check SV4 circuit (for wiring or
installation error involving SV41,
SV42 and SV43).