Carrier MMY-MAP0724FT9UL Service Manual page 148

Check code
Main Outdoor 7-segment display
remote
Check Sub-code
controller
code
00:
01: Compressor
P05 P05
1 side
02: Compressor
2 side
03: Compressor
3 side
01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side
P07 P07
Detected indoor
address
P10 P10
P12 — —
P13 P13 —
Location
of
Description
detection
I/F Detection of open
phase/phase
sequence
Inverter DC
voltage (Vdc) error
(compressor)
MG-CTT error
IPDU Heat sink
I/F overheating error
Indoor unit Indoor overflow
error
Indoor unit Indoor fan motor
error
I/F Outdoor liquid
backflow
detection error
Error detection
System status
condition(s)
All stop • Open phase is detected when
power is turned on.
• Inverter DC voltage is too high
(overvoltage) or too low
(undervoltage).
All stop Temperature sensor built into
IGBT (TH) is overheated.
All stop • Float switch operates.
• Float switch circuit is open-
circuited or disconnected at
connector.
Stop of • Motor speed measurements
corresponding continuously deviate from
unit target value.
• Overcurrent protection is
activated.
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.
– 148 –
Check items (locations)
• Check for defect in outdoor
P.C. board (I/F).
• Check wiring of outdoor
power supply.
• 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))
• 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.
• 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).
• 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.
• Check 4-way valve error.
• Check TS1, TS2 sensors.
(TS1, TS2 miswiring and
mismounting)
MG-CTT: Magnet contactor