Toshiba MMW-AP0481CHQ-E Service Manual page 56

Check code
Outdoor 7-segment display
Main
remote
Check
controller Sub-code
code
01: Compressor 1 side
02: Compressor 2 side
H01 H01
01: Compressor 1 side
02: Compressor 2 side
H02 H02
01: Compressor 1 side
02: Compressor 2 side
H03 H03
H05 H05 —
H06 H06 —
H07 H07 —
Location
Description
of
detection
IPDU Compressor
breakdown
IPDU Compressor
trouble (lockup)
MG-CTTtrouble
IPDU Current detection
circuit trouble
I/F TD1 sensor
miswiring
(incomplete
insertion)
I/F Activation of
low-pressure
protection
I/F Low oil level
protection
Check code detection
System status
condition(s)
All stop Inverter current detection
circuit detects overcurrent
and shuts system down.
All stop Overcurrent is detected
several seconds after
startup of inverter
compressor.
All stop Current flow of at least
specified magnitude is
detected despite inverter
compressor having been
shut turned off.
All stop Discharge temperature of
compressor 1 (TD1) does
not increase despite
compressor being in
operation.
All stop Low-pressure PS sensor
detects operating
pressure lower than
0.02MPa.
All stop Operating compressor
detects continuous state
of low oil level for about
2 hours.
– 56 –
Check items (locations)
• Check power supply voltage.
(AC380-415V ± 10%).
• Check for trouble in compressor.
• Check for possible cause of
abnormal overloading.
• Check for trouble in outdoor P.C.
board (A3-IPDU).
• Check for trouble in compressor.
• Check power supply voltage.
(AC380-415V ± 10%).
• Check compressor system wiring,
particularly for open phase.
• Check connection of connectors/
terminals on A3-IPDU P.C. board.
• Check conductivity of case heater.
(Check for refrigerant problem
inside compressor.)
• Check for trouble in outdoor P.C.
board (A3-IPDU).
• Check outdoor MG-CTT.
• Check current detection circuit
wiring.
• Check trouble in outdoor P.C.
board (A3-IPDU).
• Check installation of TD1 sensor.
• Check connection of TD1 sensor
connector and wiring.
• Check resistance characteristics
of TD1 sensor.
• Check for trouble in outdoor P.C.
board (I/F).
• Check service valves to confirm
full opening (both gas and liquid
sides).
• Check outdoor PMVs for clogging
(PMV1).
• Check for trouble in SV2 or SV4
circuits.
• Check for trouble in low pressure
PS sensor.
• Check indoor filter for clogging.
• Check valve opening status of
indoor PMV.
• Check refrigerant piping for
clogging.
• Check operation of outdoor fan
(during heating).
• Check for insufficiency in
refrigerant quantity.
<All outdoor units in corresponding
line to be checked>
• Check balance pipe service valve
to confirm full opening.
• Check connection and installation
of TK1, TK2, TK4, and TK5
sensors.
• Check resistance characteristics
of TK1, TK2, TK4, and TK5
sensors.
• Check for gas or oil leak in same
line.
• Check for refrigerant problem
inside compressor casing.
• Check SV3A, SV3B, SV3C, SV3D
valves for trouble.
• Check oil return circuit of oil
separator for clogging.
• Check oil equalizing circuit for
clogging.
MG-CTT: Magnet contactor