Carrier MMY-MAP0724FT9UL Service Manual page 141

Check code
Main Outdoor 7-segment display
remote
Check Sub-code
controller
code
Detected
outdoor unit
No.
E28 E28
A3-IPDU Fan
1 2 3 IPDU
01
O
02 O
03
O O
04
O
05 O O
06 O O
07
O O O
08 O
09 O O
0A
O O
0B O
O O
0C O O
E31 E31
0D
O O O
0E O
O O
0F O O O O
80
Symbol O
signifies site of
IPDU error.
80
F01 — —
F02 — —
F03 — —
F04 F04 —
F05 F05 —
01:
TE1 sensor error
02:
F06 F06
TE2 sensor error
F07 F07 —
Location
of
Description
detection
I/F Outdoor
follower unit
error
I/F IPDU
Sub
communication
MCU
error
Sub MCU
communication
error
O
Communication
error between MCU
and Sub MCU
Indoor unit Indoor TCJ
sensor error
Indoor unit Indoor TC2
sensor error
Indoor unit Indoor TC1
sensor error
I/F TD1 sensor error
I/F TD2 sensor error
I/F TE1/TE2 sensor
error
I/F TL sensor error
Error detection
System status
condition(s)
All stop Outdoor header unit receives
error code from outdoor
follower unit.
All stop Communication is disrupted
between IPDUs (P.C. boards)
in inverter box.
All stop Communication between MCU
and Sub MCU stopped.
Stop of Sensor resistance is infinity or
corresponding zero (open/short circuit).
unit
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 Sensor resistance is infinity
or zero (open/short circuit).
All stop Sensor resistance is infinity
or zero (open/short circuit).
– 141 –
Check items (locations)
• Check check code displayed
on outdoor follower unit.
<Convenient functions>
If SW04 is pushed and held for
at least 1 second while [E28] is
displayed on the 7-segment
display of outdoor header unit,
the fan of the outdoor unit that
has been shut down due to an
error comes on.
If SW04 and SW05 are pushd
simultaneously, the fans of
normal outdoor units come on.
To stop the fan or fans, push
SW05 on its own.
• Check wiring and connectors
involved in communication
between IPDU-I/F P.C. board
for bad contact or broken wire.
• Check for defect in outdoor
P.C. board (I/F, A3-IPDU or
Fan IPDU).
• Check for external noise.
• Operation of power supply
reset (OFF for 60 seconds
or more)
• Outdoor I/F PC board error
check
• Check connection of TCJ
sensor connector and wiring.
• Check resistance
characteristics of TCJ sensor.
• Check for defect in indoor
P.C. board.
• Check connection of TC2
sensor connector and wiring.
• Check resistance
characteristics of TC2 sensor.
• Check for defect in indoor
P.C. board.
• Check connection of TC1
sensor connector and wiring.
• Check resistance
characteristics of TC1 sensor.
• Check for defect in indoor
P.C. board.
• Check connection of TD1
sensor connector.
• Check resistance
characteristics of TD1 sensor.
• Check for defect in outdoor
P.C. board (I/F).
• Check connection of TD2
sensor connector.
• Check resistance
characteristics of TD2 sensor.
• Check for defect in outdoor
P.C. board (I/F).
• Check connection of TE1/
TE2 sensor connectors.
• Check resistance
characteristics of TE1/TE2
sensors.
• Check for defect in outdoor
P.C. board (I/F).
• Check connection of TL
sensor connector.
• Check resistance
characteristics of TL sensor.
• Check for defect in outdoor
P.C. board (I/F).