Toshiba HWT-601XWHT6W-E - Page 35

Hydro Unit
Installation Manual
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Defect mode detected by the Hydro Unit
Please don’t continue backup operation in a state of displaying a check code.
Remove the cause of the anomaly immediately.
O ....Possible
× ....Not possible
O ....Possible
× ....Not possible
Check
code
Diagnostic functional operation
Determination and action
Operational cause
Backup
operation
Automatic
reset
A01
Pump or flowing quantity error
Detected by flow rate abnormality
Heating
×
Hot water
O
×
1. Almost no or little water flow.
• Not enough vent air
• Dirt clogging in the water piping system.
• The water piping is too long.
• Installation of buffer tank and secondary pump
A02
Temperature increase error
(heating)
(TWI, TWO, THO)
Heating
×
Hot water
O
O
1. Check the water inlet, water outlet and heater outlet
(TWI, TWO, THO) sensors.
2. Defect of the backup heater (defect automatic reset
thermostat).
A03
Temperature increase error (hot
water supply)
(TTW)
Heating
O
Hot water
×
O
1. Check the hot water cylinder sensor (TTW).
2. Check the hot water cylinder thermal cut-out.
A04
Antifreeze operation
O ×
1. Almost no or little water flow.
• Dirt clogging in the water piping system.
• The water piping is too long or too short.
2. Check the heater power circuit.
• Power supply voltage, breaker, power supply
connection
3. Set the presence of the backup heater.
4. Check the water inlet, water outlet and heat exchange
(TWI, TWO, TC) sensors and flow sensor.
A05
Piping antifreeze operation
O O
1. Check the heater power circuit.
• Power supply voltage, breaker, power supply
connection
2. Check the water inlet, water outlet and heater outlet
sensors (TWI, TWO, THO).
3. Disconnection of the backup heater.
A08
Low pressure sensor operation
error
O ×
1. Almost no or little water flow.
2. Defect of the flow sensor.
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).
A09
Overheat protection operation
(Thermostat of the backup heater)
Heating
×
Hot water
O
×
1. No water (heating without water) or no water flow.
2. Defect of the flow sensor.
3. Defect of the backup heater (poor automatic reset
thermostat).
A10
Antifreeze operation 2
O ×
1. Almost no or little water flow.
2. Check the water inlet, water outlet and heat exchange
(TWO, TC) sensors.
A11
Operation of the release protection
Heating
×
Hot water
O
×
1. Almost no water flow.
2. Defect of the flow sensor.
3. Check the water outlet temperature sensor (TWO).
Check
code
Diagnostic functional operation
Determination and action
Operational cause
Backup
operation
Automatic
reset
A12
Heating, hot water heater error
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
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.
A14
Pump error
Heating
×
Hot water
O
×
• Low supply voltage.
• Pump lock due to clogging of dust.
A15
Pump error (for zone2)
O ×
• Low supply voltage.
• Pump lock due to clogging of dust.
E03
Regular communication error
between Hydro Unit and remote
controller
× O
1. Check remote controller connection.
2. Defect in the remote controller.
E04
Regular communication error
between Hydro Unit and Outdoor
Unit
O O
1. Check the serial circuit.
• Miswiring of the crossover between the Hydro Unit
and the Outdoor Unit
E08
Duplicate address of Hydro Unit, or
Duplicate master Hydro Unit during
Group control
× O 1. Check Hydro Unit addresses. (DN 14)
E14
Regular communication error
between Hydro Unit and 0-10V-IF
× O
1. Check the 0-10V-IF connection.
2. Defect in the 0-10V-IF.
E18
Regular communication error
between master Hydro Unit and
slave Hydro Unit during Group
control
× O
1. Check the Hydro Unit connection.
• Miswiring of the master and slave Hydro Unit.
F03
TC sensor error
O O
1. Check the resistance value and connection of the
heat exchange temperature sensor (TC).
F10
TWI sensor error
O O
1. Check the resistance value and connection of the
water inlet temperature sensor (TWI).
F11
TWO sensor error
Heating
×
Hot water
O
O
1. Check the resistance value and connection of the
water outlet temperature sensor (TWO).
F14
TTW sensor error
Heating
O
Hot water
×
O
1. Check the resistance value and connection of the
hot water cylinder sensor (TTW).
F17
TFI sensor error
Heating
×
Hot water
O
O
1. Check the resistance value and connection of the
floor-inlet temperature sensor (TFI).
67-EN
68-EN