Toshiba MMD-AP0726HP-UL Service Manual page 63

Check code
Outdoor 7-segment display
Main
remote
Check
Sub-code
control
code
F08 F08 –
01: TG1 sensor trouble
F09 F09
02: TG2 sensor trouble
F10 – –
F11 – –
01: TS1 sensor trouble
F12 F12
03: TS3 sensor trouble
01: Compressor 1 side
F13 F13
02: Compressor 2 side
F15 F15 –
F16 F16 –
F23 F23 –
F24 F24 –
Location
System
of Description
status
detection
I/F TO sensor All stop
trouble
TG1/TG2
All stop
I/F
sensor trouble
Indoor Indoor TA Stop of
sensor trouble
unit corresponding
unit
Indoor Indoor TF Stop of
sensor trouble
unit corresponding
unit
TS1/TS3
I/F All stop
sensor trouble
IPDU TH sensor All stop
trouble
I/F Outdoor All stop
temperature
sensor wiring
trouble (TE1,
TL1)
I/F Outdoor All stop
pressure
sensor wiring
trouble
(Pd, Ps)
I/F Ps sensor All stop
trouble
I/F Pd sensor All stop
trouble
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Trouble detection
Check items (locations)
condition(s)
Sensor resistance is infinity • Check connection of TO
or zero (open/short circuit). sensor connector.
• Check resistance
characteristics of TO sensor.
• Check for defect in outdoor
P.C. board (I/F).
• Check connection of TG1/TG2
Sensor resistance is infinity
sensor connectors.
or zero (open/short circuit).
• Check resistance characteristics
of TG1/TG2 sensors.
• Check for defect in outdoor P.C.
board (I/F).
Sensor resistance is infinity • Check connection of TA
or zero (open/short circuit). sensor connector and wiring.
• Check resistance
characteristics of TA sensor.
• Check for defect in indoor P.C.
board.
Sensor resistance is infinity • Check connection of TF
or zero (open/short circuit). sensor connector and wiring.
• Check resistance
characteristics of TF sensor.
• Check for defect in indoor P.C.
board.
• Check connection of TS1/
Sensor resistance is infinity
TS3 sensor connector
or zero (open/short circuit).
• Check resistance
characteristics of TS1/TS3
sensor.
• Check for defect
• Defect in IPM built-in
Sensor resistance is infinity
or zero (open/short circuit). temperature sensor
Replace A3-IPDU P.C.
board.
During compressor • Check installation of
operation in HEAT mode, TE1 and TL1 sensors.
TL1 continuously provides • Check resistance
temperature reading higher
characteristics of TE1 and TL1
than indicated by TL1 by at sensors.
least specified margin for 3 • Check for outdoor P.C. board
(I/F) trouble.
minutes or more.
Readings of high-pressure • Check connection of high-
Pd sensor and low- pressure Pd sensor connector.
pressure Ps sensor are • Check connection of low-
switched. pressure Ps sensor connector.
Output voltages of both • Check for defect in pressure
sensors are zero. sensors Pd and Ps.
• Check for trouble in outdoor
P.C. board (I/F).
• Check for deficiency in
compressive output of
compressor.
• Check for connection trouble
Output voltage of Ps
sensor is zero. involving Ps sensor and Pd
sensor connectors.
• Check connection of Ps sensor
connector.
• Check for defect in Ps sensor.
• Check for deficiency in
compressive output of
compressor.
• Check for defect in 4-way
valve.
• Check for defect in outdoor
P.C. board (I/F).
• Check for defect in SV4 circuit.
Output voltage of Pd • Check connection of Pd
sensor is zero (sensor sensor connector.
open-circuited). • Check for defect in Pd sensor.
Pd > 602psi(4.15MPa)
• Check for defect in outdoor
despite compressor P.C. board (I/F).
having been turned off.