Carrier MMY-MAP0724FT9UL Service Manual page 142

Check code
Main Outdoor 7-segment display
remote
Check Sub-code
controller
code
F08 F08 —
F10 — —
F11 — —
F12 F12 —
01:
Compressor 1 side
02:
F13 F13
Compressor 2 side
03:
Compressor 3 side
F15 F15 —
F16 F16 —
F22 F22 —
F23 F23 —
F24 F24 —
F29 — —
Location
of
Description
detection
I/F TO sensor error
Indoor unit Indoor TA sensor
error
Indoor unit Indoor TF sensor
error
I/F 01:
TS1 sensor error
02:
TS2 sensor error
IPDU TH sensor
error
I/F Outdoor
temperature
sensor wiring
error (TE1, TL)
I/F Outdoor
pressure
sensor wiring
error (Pd, Ps)
I/F TD3 sensor error
I/F Ps sensor error
I/F Pd sensor error
Indoor unit Other indoor error
Error detection
System status
condition(s)
All stop Sensor resistance is infinity
or zero (open/short circuit).
Stop of Sensor resistance is infinity
corresponding or zero (open/short circuit).
unit
Stop of Sensor resistance is infinity
corresponding or zero (open/short circuit).
unit
All stop Sensor resistance is infinity
or zero (open/short circuit).
All stop Sensor resistance is infinity
or zero (open/short circuit).
All stop During compressor operation in
HEAT mode, TE1 continuously
provides temperature reading
higher than indicated by TL by
at least specified margin for 3
minutes or more.
All stop Readings of high-pressure
Pd sensor and lowpressure
Ps sensor are switched.
Output voltages of both sensors
are zero.
All stop Sensor resistance is infinity
or zero. (open/short circuit)
All stop Output voltage of Ps
sensor is zero.
All stop Output voltage of Pd sensor is
zero (sensor open-circuited).
Pd > 602 psi (4.15 MPa) despite
compressor having been turned
off.
Stop of Indoor P.C. board
corresponding does not operate normally.
unit
– 142 –
Check items (locations)
• Check connection of TO
sensor connector.
• Check resistance
characteristics of TO sensor.
• Check for defect in outdoor
P.C. board (I/F).
• Check connection of TA
sensor connector and wiring.
• Check resistance
characteristics of TA sensor.
• Check for defect in indoor
P.C. board.
• Check connection of TF
sensor connector and wiring.
• Check resistance
characteristics of TF sensor.
• Check for defect in indoor
P.C. board.
• Check connection of TS1, TS2
sensor connector.
• Check resistance
characteristics of TS1, TS2
sensor.
• Check for defect in outdoor
P.C. board (I/F).
• Defect in IGBT built-in
temperature sensor
→ Replace A3-IPDU
P.C. board.
• Check installation of TE1 and
TL sensors.
• Check resistance
characteristics of TE1 and TL
sensors.
• Check for outdoor P.C. board
(I/F) error.
• Check connection of high-
pressure Pd sensor connector.
• Check connection of low-
pressure Ps sensor connector.
• Check for defect in pressure
sensors Pd and Ps.
• Check for error in outdoor
P.C. board (I/F).
• Check for deficiency in
compressive output of
compressor.
• Check connection of TD3
sensor connector.
• Check resistance
characteristics of TD3 sensor.
• Check for defect in outdoor
P.C. board (I/F).
• Check for connection error
involving Ps sensor and Pd
sensor connectors.
• Check connection of Ps
sensor connector.
• Check for defect in Ps sensor.
• Check for deficiency in
compressive output of
compressor.
• Check for defect in 4-way
valve.
• Check for defect in outdoor
P.C. board (I/F).
• Check for defect in SV4, SV5
circuit.
• Check for defect in indoor P.C.
board (faulty EEPROM)