Toshiba HWS-455XWHM3-E Installationshandbuch Seite 58

Hydro Unit
Check
code
Operational cause
Temperature increase error (hot
water supply)
A03
(TTW)
Antifreeze operation
A04
Piping antifreeze operation
A05
Pressure switch operation
A07
Low pressure sensor operation
error
A08
Overheat protection operation
(Thermostat of the backup heater)
A09
Antifreeze operation 2
A10
Operation of the release protection
A11
Heating, hot water heater error
A12
57-EN
Diagnostic functional operation
Backup
operation
Heating
Hot water
Heating
Hot water
Heating
Cooling
Hot water
Automatic
reset
O 1. Check the hot water cylinder sensor (TTW).
O
2. Check the hot water cylinder thermal cut-out.
×
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
O
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 Switch.
1. Check the heater power circuit.
• Power supply voltage, breaker, power supply
connection
O O
2. Check the water inlet, water outlet and heater outlet
sensors (TWI, TWO, THO).
3. Disconnection of the backup heater.
1. Almost no or little water flow.
2. Defect of the flow switch.
×
O
3. On-load operation under the above conditions.
4. Defect in the high pressure switch.
5. Failure of a refrigerant value to open.
1. Almost no or little water flow.
2. Defect of the flow switch.
3. On-load cooling or prolonged defrosting (a lot of frost
×
O
formation) under the above conditions.
4. Defect in the low pressure sensor.
5. Check the refrigeration cycle (gas leak).
1. No water (heating without water) or no water flow.
×
2. Defect of the flow switch.
×
3. Defect of the backup heater (poor automatic reset
thermostat).
O
1. Almost no or little water flow.
×
O
2. Check the water inlet, water outlet and heat exchange
(TWO, TC) sensors.
1. Almost no water flow.
×
×
2. Defect of the flow switch.
3. Check the water outlet temperature sensor (TWO).
O
1. Activated by a large load of heating or hot water
supply.
2. Check the heater power circuit (backup or hot water
O O
cylinder heater).
• Power supply voltage, breaker, power supply
connection
– 57 –
Installation Manual
O ... Possible
× .... Not possible
Determination and action