Toshiba MML-AP0124H2UL Service Manual page 62

Check code
Main
Outdoor 7-segment display
remote
Check
Sub-code
control
code
H06 H06 —
H07 H07 —
01: TK1 sensor trouble
02: TK2 sensor trouble
04: TK4 sensor trouble
05: TK5 sensor trouble
H08 H08
H15 H15 —
Location
of
Description System status
detection
I/F Activation of 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
All stop
All stop
I/F TD2 sensor All stop
miswiring
(incomplete
insertion)
Trouble detection
condition(s)
Low-pressure Ps sensor detects
operating pressure lower than
0.02MPa.
Operating compressor detects
continuous state of low oil level for
about 2 hours.
Sensor resistance is infinity or zero
(open/short circuit).
Sensor resistance is infinity or zero
(open/short circuit).
Sensor resistance is infinity or zero
(open/short circuit).
Sensor resistance is infinity or zero
(open/short circuit).
Discharge temperature of (TD2)
does not increase despite
compressor 2 being in operation.
– 62 –
Check items (locations)
• Check service valves to confirm
full opening (both gas and liquid
sides).
• Check outdoor PMVs for clogging
(PMV1).
• Check for defect in SV2 or SV4
circuits.
• Check for defect in lowpressure
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 balance pipe service valve
to confirm full opening.
• Check connection and installation
of TK1, TK2, TK4, and TK5
sensors.
• Check resistance characteristics
of TK1, TK2, TK4, and TK5
sensors.
• Check for gas or oil leak in same
line.
• Check for refrigerant problem
inside compressor casing.
• Check SV3A, SV3B, SV3C,
SV3D valves for defect.
• 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 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 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 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).