Carrier MMY-MAP0724FT9UL Service Manual page 147

Check code
Main Outdoor 7-segment display
remote
Check Sub-code
controller
code
— L31 —
P01 — —
—
P03 P03
01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side
P04 P04
Location
of
Description
detection
I/F Extended IC error
Indoor unit Indoor fan motor
error
I/F Discharge
temperature
TD1 error
IPDU Activation of high-
pressure SW
Error detection
System status
condition(s)
Continued There is part failure
operation in P.C. board (I/F).
Stop of
corresponding
unit
All stop Discharge
temperature (TD1)
exceeds
239˚F (115˚C).
All stop High-pressure SW is
activated.
– 147 –
Check items (locations)
Check outdoor P.C. board (I/F).
• Check the lock of fan motor (AC fan).
• Check wiring.
• Check outdoor service valves (discharge
gas side, suction gas side, liquid side) to
confirm full opening.
• Check outdoor PMVs (PMV1, 2, 4) for
clogging.
• Check resistance characteristics of TD1
sensor.
• Check for insufficiency in refrigerant
quantity.
• Check for defect in 4-way valve.
• Check for leakage of SV4 circuit.
• Check SV4 circuit (wiring or installation
error in SV41, SV42 or SV43).
• Check SV5 circuit leakage.
• Check SV6 circuit leakage.
(Capillary clogging, valve operation error)
• Check mispiping of discharge/suction gas
main pipes.
• Check Cool/Heat FS unit.
SVD valve, SVS valve leakage check
(SVDD valve, SVSS leakage check)
Mispiping of FS unit connecting pipe
(suction gas/discharge gas)
Check connection of connector between
FS unit and indoor unit.
Check miswiting between SVS and SVD
valve.
• Check connection of highpressure SW
connector.
• Check for defect in Pd pressure sensor.
• Check outdoor service valves (discharge
gas side, suction 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, 4) for
clogging.
• Check indoor/outdoor heat exchangers
for clogging.
• Check for short-circuiting of outdoor
suction/discharge air flows.
• Check 4-way valve error.
• Check SV11 circuit.
(Valve operation error)
• Check checked valve of discharge gas
pipe for error.
• 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.
• Check mispiping of discharging gas/
suction gas main pipes.
• Check circuit clogging at liquid side of
sub heat exchanger.
(PMV4, checked valve)
• Check FS unit.
Check SVD valve clogging and operation
error.
Check wiring inside of FS unit.
(SVD/SVS coil miswiring, etc.)
Check wiring between FS unit and indoor
unit. (Mistaken wiring, wire disconnection,
wiring forgotten)