Carrier MMY-MAP0724FT9UL Service Manual page 144

Check code
Main Outdoor 7-segment display
remote
Check Sub-code
controller
code
Detected
outdoor unit No.
Display of
header unit only
H07 H07
01: TK1 sensor
error
02: TK2 sensor
error
03: TK3 sensor
error
04: TK4 sensor
error
05: TK5 sensor
error
H08 H08
H15 H15 —
Location
of
Description
detection
I/F Low oil level
protection
I/F Error in
temperature
sensor for oil level
detection
I/F TD2 sensor
miswiring
(incomplete
insertion)
Error detection
System status
condition(s)
All stop Operating compressor detects
continuous state of low oil level
for about 2 hours.
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).
All stop Sensor resistance is infinity
or zero (open/short circuit).
All stop Discharge temperature of (TD2)
does not increase despite
compressor 2 being in
operation.
– 144 –
Check items (locations)
<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, TK3,
TK4, and TK5 sensors.
• Check resistance
characteristics of TK1, TK2,
TK3, TK4, and TK5 sensors.
• Check for gas or oil leak in
same line.
• Check for refrigerant
entrapment inside compressor
casing and check for liquid
back.
• Check SV3A, SV3B, SV3C,
SV3D, SV3E, and SV3F
valves for defect.
• Check oil return circuit of oil
separator for clogging.
• Check oil equalizing circuit for
clogging.
• Check SV6 circuit leakage.
• Check connection of TK1
sensor connector.
• Check resistance
characteristics of TK1 sensor.
• Check for defect in outdoor
P.C. board (I/F).
• Check connection of TK2
sensor connector.
• Check resistance
characteristics of TK2 sensor.
• Check for defect in outdoor
P.C. board (I/F).
• Check connection of TK3
sensor connector.
• Check resistance
characteristics of TK3 sensor.
• Check for defect in outdoor
P.C. board (I/F).
• Check connection of TK4
sensor connector.
• Check resistance
characteristics of TK4 sensor.
• Check for defect in outdoor
P.C. board (I/F).
• Check connection of TK5
sensor connector.
• Check resistance
characteristics of TK5 sensor.
• Check for defect in outdoor
P.C. board (I/F).
• Check installation of TD2,
TK1, TK2, TK3 sensor.
• Check connection of TD2,
TK4, TK5 sensor connector
and wiring.
• Check resistance
characteristics of TD2 sensor.
• Check for defect in outdoor
P.C. board (I/F).