Toshiba ESTIA HWS-1501CSHM3-E, Service Manual

Page: 90 / 212

89
P20
High pressure protection operation
When an abnormal stop occurs due to
the high pressure release control.
When the heat exchange temperature
sensor (TL) detects 63°C during the
cooling operation.
When the water outlet sensor (TWO)
detects 60°C during the heating or hot
water supply operation.
O
×
1. Check that the service valve is fully
open.
2. Defect of the pulse motor valve.
3. Check the outdoor fan system
(including clogging).
4. Over-filling of refrigerant.
5. Check the resistance value of the
heat exchange temperature sensor
(TL) and the water outlet
temperature sensor (TWO).
10 117
P22
Outdoor fan system error
When a DC fan rotor position detection
NG, element short circuit, loss of
synchronization, or abnormal motor
current occurs.
O
×
1. Check the lock status of the motor
fan.
2. Check the connection of the fan
motor cable connector.
3. Check the power supply voltage.
(AC220~230 V±10%: single phase
type)
(AC380~400 V±10%: 3 phase type)
1-4 118
P26
Short circuit of the compressor driver
element error
When an abnormal short circuit of IGBT
is detected.
O
×
1. P26 abnormality occurs when
operating with the compressor
wiring disconnected … Check the
control board.
2. No abnormality occurs when
operating with the compressor
wiring disconnected … Compressor
rare short.
8 118
P29
Compressor rotor position error
The rotor position in the compressor
cannot be detected.
O
×
1. Even if the connection lead wire of
the compressor is disconnected, it
stops due to an abnormality in the
position detection … Replace the
inverter control board.
2. Check the wire wound resistor of the
compressor. Short circuit
… Replace the compressor.
8 118
Check
code
Diagnostic functional operation
Determination and action
Number of
abnormalities
for
confirmation
Detailed
item
Operational cause
Backup
present Automat
ic reset