Toshiba MMD- AP0724H2UL, Service Manual

Page: 62 / 84

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Check code
Location
of
detection
Description System status
Error detection
condition(s)
Check items (locations) Main
remote
controller
Outdoor 7-segment display
Check code Sub-code
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).
H15 H15 –
I/F TD2 sensor
miswiring
(incomplete
insertion) All stop Air discharge temperature of
(TD2) does not increase
despite compressor 2 being
in operation. • Check installation of TD2
sensor.
• Check connection of TD2
sensor connector and
wiring.
• Check resistance
characteristics of TD2
sensor.
• Check for defect in outdoor
P.C. board (I/F).