Toshiba HWS-P1105HR-E, Service Manual

Page: 76 / 184

75
A07
Combination error
Model name of the Hydro unit is
different. O
×
1. Check DP_SW13_4 is set to "ON". 1 —
A08
Low pressure sensor operation error
The low pressure sensor detected 0.2
MPa or less.
O
×
1. Almost no or little water flow.
2. Defect of the flow switch.
3. On-load cooling or prolonged
defrosting (a lot of frost formation)
under the above conditions.
4. Defect in the low pressure sensor.
5. Check the refrigeration cycle (gas
leak)
8 87
A09
Overheat protection operation
When the thermostat of the backup
heater activates during the operation of
the heat pump or backup heater.
When the thermostat operation is
activated while it has been stopped.
Heating
×
Hot water
O
×
1. No water (heating without water) or
no water flow.
2. Defect of the flow switch.
2
88
3. Defect of the backup heater (poor
automatic reset thermostat).
1
A10
Antifreeze operation (2)
When TC-TWO<-15K detected in
cooling mode.
O
×
1. Almost few water flow.
2. Defect of the flow switch.
3. Low refrigerant.
10 89
A11
Operation of the release protection
When the TWO release counts to 10.
Heating
Cooling
×
Hot water
O
×
1. Almost no water flow.
2. Defect of the flow switch.
3. Check the water outlet temperature
sensor (TWO).
10 90
A12
Heating, hot water heater
The antifreeze control is detected under
the condition of TWI<15 °C while
TWI
≥ 15 °C, TTW ≥ 20 °C is not detected
after the heater backup.
O O
1. Activated by a large load of heating
or hot water supply.
2. Check the heater power circuit
(backup or hot water cylinder
heater).
• Power supply voltage, breaker,
power supply connection
1 91
A13 Pump error
Heating
×
Hot water
O
×
1. Pump has stopped by a certain
cause.
• Low supply voltage.
• High humidity around the electric box
of the pump.
• Dew condensation to the electric
board of the pump.
• Once turn off the power supply to the
system and turn on again and
operate the system.
2. Check the Flow switch in the Hydro
unit.
2 92
E03
Regular communication error
between hydro unit and remote
controller
When there is no regular communication
from the remote controller for 3 min, or
when no remote controller is equipped.
×
O
1. Check remote controller connection.
2. Defect in the remote controller.
1 —
Check
code
Diagnostic functional operation
Determination and action
Number of
abnormalities
for
confirmation
Detailed
item
Operational cause
Backup
operation
Automatic
reset