Toshiba MMU-UP0071MH-UL Service Manual page 105

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
H05 H05 —
H06 H06 —
H07 H07 —
01: TK1 sensor
trouble
02: TK2 sensor
trouble
H08 H08
H15 H15 —
Location
Description
of
detection
I/F TD1 sensor
miswiring
(incomplete
insertion)
I/F Activation of
low-pressure
protection
I/F Low oil level
protection
I/F Trouble in
temperature
sensor for oil
level detection
I/F TD2 sensor
miswiring
(incomplete
insertion)
Check code detection
System status
condition(s)
All stop Discharge temperature of
compressor 1 (TD1) does
not increase despite
compressor being in
operation.
All stop Low-pressure Ps sensor
detects operating pressure
lower than 0.02MPa.
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 Discharge temperature of
(TD2) does not increase
despite compressor 2 being
in operation.
– 105 –
Check items (locations)
• Check installation of TD1
sensor.
• Check connection of TD1
sensor connector and
wiring.
• Check resistance
characteristics of TD1
sensor.
• Check for failure in outdoor
P.C. board (I/F).
• Check service valves to
confirm full opening
(both gas and liquid sides).
• Check outdoor PMVs for
clogging (PMV1, 2, 3).
• Check for failure in SV4
circuits.
• Check for failure in low-
pressure Ps sensor.
• Check indoor filter for
clogging.
• Check valve opening
status of indoor PMV.
• Check refrigerant piping for
clogging.
• Check operation of outdoor
fan (during heating).
• Check for insufficiency in
refrigerant quantity.
<All outdoor units in
corresponding line to be
checked>
• Check connection and
installation of TK1 and TK2
sensors.
• Check resistance
characteristics of TK1 and
TK2 sensors.
• Check for gas or oil leak in
same line.
• Check for refrigerant
problem inside compressor
casing.
• Check SV3D, SV3F valves
for failure.
• Check oil return circuit of
oil separator for clogging.
• Check oil equalizing circuit
for clogging.
• Check connection of TK1
sensor connector.
• Check resistance
characteristics of TK1
sensor.
• Check for failure in outdoor
P.C. board (I/F).
• Check connection of TK2
sensor connector.
• Check resistance
characteristics of TK2
sensor.
• Check for failure in outdoor
P.C. board (I/F).
• Check installation of TD2
sensor.
• Check connection of TD2
sensor connector and
wiring.
• Check resistance
characteristics of TD2
sensor.
• Check for failure in outdoor
P.C. board (I/F).