Toshiba ESTIA R32 HWT-401HW-E Manual page 83

Diagnostics of functional operation
Error
Code
Technical cause
Low pressure sensor malfunction
A08 The low pressure sensor detects 0.2 MPa or
less
Overheating protection mode
- If the thermostat on the backup heater
is activated while the heat pump
A09
or backup heater is in operation.
- If operation of the thermostat is activated
despite the fact that it has been stopped
Frost protection mode (2)
A10
If TC-TWO<-15K in cooling mode
Operation of the release protection
A11
If TWO release goes toward 10
Heating or hot water heating
The frost protection control detects under
A12 the condition of TWI<15°C while TWI≥15°C,
TW≥20°C downstream of the heating
backup is not detected
A13 Pump fault
A14 Pump fault
Error in normal communication
between Hydrobox and remote control
E03 If there is no normal communication from the
remote control for 3 minutes or if no remote
control is connected
Error in normal communication between
Hydrobox and outdoor unit
E04
The continuous signal cannot be received by
the outdoor unit
Duplicated address of the Hydrobox
E08 or duplicated master Hydrobox during
group control
Backup
Automatic
present
reset
1. Hardly any or low water flow rate
2. Flow switch defect
3. Under-load cooling or prolonged defrosting
O X
4. Low pressure sensor defect
5. Check the refrigerant circuit (gas leakage)
1. No water (heating without water) or no water
Heating
X 2. Flow switch defect
X
Hot water
Backup heater defect (fault on thermostats for
O
automatic reset)
1. Hardly any water flow
O X 2. Flow switch defect
3. Refrigerant low
Heating
Cooling 1. Hardly any water flow
X X 2. Flow switch defect
Hot water 3. Check water outlet temperature sensor (TWO)
O
1. Activated due to high heating or hot water
2. Check heating circuit (auxiliary or hot water
O O
1. Pump has stopped for various reasons
Heating
X
X
Hot water
O
2. Check the flow switch in the Hydrobox
1. Pump has stopped for various reasons
Heating
X
X
Hot water
O
2. Check the power supply
1. Check the remote control connection
X O
2. Remote control defect
Check the series connection
O O
Correct the address number of rotary switch
X O
"SW01" for the Hydrobox
Determination and measures
(heavy frost formation) under the above
conditions
flow
supply load
cylinder heating)
- Power supply voltage, cut-out, power supply
connection
- Low voltage
- High humidity around the electrobox of the
pump
- Condensation formation on the electric
PCB of the pump
- Switch off the power supply then switch it back
on to operate the system
- Low voltage
- High humidity around the electrobox of the
pump
- Condensation formation on the electric
PCB of the pump
- Switch off the power supply then switch it back
on to operate the system
- Miswiring at the crossover point between the
water-to-air heat exchanger and the outdoor
unit
TOSHIBA I 43 I 43
TOSHIBA