Toshiba MMY-MAP0804HT8-E Service Manual page 189

Outdoor 7-segment display
Main
remote
Check
controller
code
P04 P04
P05 P05
P07 P07
P10 P10
P12 –
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Check code
Location
AI-NET central
of
control
detection
remote
Sub-code
controller
01: Compressor IPDU
1 side
02: Compressor
2 side
03: Compressor
3 side
21
00: I/F
01: Compressor
1 side
AF
02: Compressor
2 side
03: Compressor
3 side
01: Compressor IPDU
1 side I/F
02: Compressor
2 side
03: Compressor
3 side
1C
Detected indoor Indoor
address unit
0b
Indoor
unit
– 11
manuals search engine
System
Description
status
Activation of high- All stop
pressure SW
Detection of open All stop
phase/phase sequence
Inverter DC voltage
(Vdc) error
(compressor)
MG-CTT error
Heat sink overheating All stop
error
Indoor overflow error All stop
Indoor fan motor error Stop of
corresponding
unit
188
Error detection
Check items (locations)
condition(s)
High-pressure SW is • Check connection of high-
activated. pressure SW connector.
• Check for defect in Pd
pressure sensor.
• Check outdoor service valves
(gas side, liquid side) to
confirm full opening.
• Check for defect in outdoor
fan.
• Check for defect in outdoor
fan motor.
• Check outdoor PMVs (PMV1,
2) 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 defect in outdoor
P.C. board (I/F).
• Check for error in indoor fan
system (possible cause of air
flow reduction).
• Check opening status of
indoor PMV.
• Check indoor-outdoor
communication line for wiring
error.
• Check for faulty operation of
check valve in discharge pipe
convergent section.
• Check gas balancing SV4
valve circuit.
• Check SV5 valve circuit.
• Check for refrigerant
overcharging.
• Open phase is • Check for defect in outdoor
detected when P.C. board (I/F).
power is turned
on.
• Inverter DC
voltage is too high
(overvoltage) or
too low
(undervoltage).
Temperature sensor • Check power supply voltage.
built into IGBT (TH) • Check outdoor fan system
is overheated. 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))
• Float switch • Check float switch connector.
operates. • Check operation of drain
• Float switch circuit pump.
is open-circuited • Check drain pump circuit.
or disconnected at • Check drain pipe for clogging.
connector. • Check for defect in indoor
P.C. board.
• Motor speed • Check connection of fan
measurements connector and wiring.
continuously • Check for defect in fan motor.
deviate from target • Check for defect in indoor
value. P.C. board.
• Overcurrent • Check impact of outside air
protection is treatment (OA).
activated.
MG-CTT: Magnet contactor