Toshiba Carrier MMU-AP0074HPUL, Service Manual

Page: 68 / 105

H07 H07
I/F Low oil level
protection All stop Operating compressor
detects continuous state of
low oil level for about 2 hours. <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.
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.
H08 H08
01: TK1 sensor
error
02: TK2 sensor
error
03: TK3 sensor
error
04: TK4 sensor
error
05: TK5 sensor
error I/F Error in
temperature
sensor for oil
level detection All stop Sensor resistance is infinity
or zero (open / short circuit). Check connection of TK1
sensor connector.
Check resistance
characteristics of TK1
sensor.
Check for defect in outdoor
P.C. board (I/F).
All stop Sensor resistance is infinity
or zero (open / short circuit). Check connection of TK2
sensor connector.
Check resistance
characteristics of TK2
sensor.
Check for defect in outdoor
P.C. board (I/F).
All stop Sensor resistance is infinity
or zero (open / short circuit). Check connection of TK3
sensor connector.
Check resistance
characteristics of TK3
sensor.
Check for defect in outdoor
P.C. board (I/F).
All stop Sensor resistance is infinity
or zero (open / short circuit). Check connection of TK4
sensor connector.
Check resistance
characteristics of TK4
sensor.
Check for defect in outdoor
P.C. board (I/F).
All stop Sensor resistance is infinity
or zero (open / short circuit). Check connection of TK5
sensor connector.
Check resistance
characteristics of TK5
sensor.
Check for defect in outdoor
P.C. board (I/F).
Check code
Location
of
detection
Description System status
Error detection
condition(s)
Check items (locations)
Outdoor 7-segment display
Sub-code
Check
code
Main
remote
controller
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