Toshiba MMD-UP0721HFP-UL Service Manual page 73

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 System status
of
detection
I/F TD1 sensor All stop
miswiring
(incomplete
insertion)
Activation of
I/F All stop
low-pressure
protection
I/F Low oil level All stop
protection
I/F Trouble in All stop
temperature
sensor for oil
level detection
All stop
I/F TD2 sensor All stop
miswiring
(incomplete
insertion)
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Check code detection
Check items (locations)
condition(s)
Discharge temperature of • Check installation of TD1
compressor 1 (TD1) does sensor.
not increase despite • Check connection of TD1
compressor being in sensor connector and
operation. wiring.
• Check resistance
characteristics of TD1
sensor.
• Check for failure in outdoor
P.C. board (I/F).
• Check service valves to
Low-pressure Ps sensor
detects operating pressure confirm full opening
lower than 0.02MPa. (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.
Operating compressor <All outdoor units in
detects continuous state of corresponding line to be
low oil level for about 2 checked>
hours. • 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.
Sensor resistance is infinity • Check connection of TK1
or zero (open/short circuit). sensor connector.
• Check resistance
characteristics of TK1
sensor.
• Check for failure in outdoor
P.C. board (I/F).
Sensor resistance is infinity • Check connection of TK2
or zero (open/short circuit). sensor connector.
• Check resistance
characteristics of TK2
sensor.
• Check for failure in outdoor
P.C. board (I/F).
Discharge temperature of • Check installation of TD2
(TD2) does not increase sensor.
despite compressor 2 being • Check connection of TD2
in operation. sensor connector and
wiring.
• Check resistance
characteristics of TD2
sensor.
• Check for failure in outdoor
P.C. board (I/F).