Toshiba HWT-601HW-E - Page 100

99
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 sensor.
2
112
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 sensor.
3. Low refrigerant.
10 113
A11
Operation of the release protection
When the TWO release counts to 10.
Heating
×
Hot water
O
×
1. Almost no water flow.
2. Defect of the flow sensor.
3. Check the water outlet temperature
sensor (TWO).
10 114
A12
Heating, hot water heater error
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.
OO
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
1115
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.
• Pump lock due to clogging or dust.
• Once turn off the power supply to the
system and turn on again and
operate the system.
Mainly low voltage to the system.
2116
A14
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.
• Pump lock due to clogging or dust.
• Once turn off the power supply to the
system and turn on again and
operate the system.
Mainly except low voltage to the
system.
2116
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