Toshiba Estia HWS-803XWHM3-E Manuel D'installation page 42

Hydro Unit
Check
code
Operational cause
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
Operation of the release protection
A11
Heating, hot water heater error
A12
Regular communication error
E03 between hydro unit and remote
controller
Regular communication error
E04 between hydro unit and outdoor
unit
TC sensor error
F03
TWI sensor error
F10
TWO sensor error
F11
41-EN
Diagnostic functional operation
Backup
present
Heating
Cooling
Hot water
Automatic
reset
1. Almost no or little water flow.
• Dirt clogging in the water piping system.
• The water piping is too long.
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.
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 pressure switch.
1. Almost no or little water flow.
2. Defect of the flow switch.
×
O 3. On-load cooling or prolonged defrosting (a lot of frost
formation) under the above conditions.
4. Defect in the low pressure sensor.
1. No water (heating without water) or no water flow.
2. Defect of the flow switch.
×
O
3. Defect of the backup heater (poor automatic reset
thermostat).
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
1. Check remote control connection.
×
O
2. Defect in the remote control.
1. Check the serial circuit.
• Miswiring of the crossover between the water heat
O O
exchanger and the outdoor unit
1. Check the resistance value and connection of the
O O
heat exchange temperature sensor (TC).
1. Check the resistance value and connection of the
O O
water inlet temperature sensor (TWI).
1. Check the resistance value and connection of the
×
O
water outlet temperature sensor (TWO).
– 42 –
Installation Manual
O ... Possible
× .... Not possible
Determination and action