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Diagnostics of functional operation
Error
Code
Technical cause
TFI sensor fault
F20
If TWO-TFI>40K and TFI<TWI-5K was
detected for 60 seconds
Low pressure sensor fault
- If PS<0.07 MPa was detected for
90 seconds or more (cooling, defrosting)
F23
- If PS<0.07 MPa was detected for
10 minutes or more (hot water preparation,
heating)
PD sensor fault
F24
Interruption or short circuit in the high
pressure sensor
EEPROM error
If the file sent to EEPROM (e.g., changes to
F29
error codes) is damaged and no transfer is
confirmed by the internal storage element
Fault in the extended integrated
switching circuit
F30
If the extended integrated switching circuit is
abnormal
EEPROM error
F31
Flow sensor fault
F32
Flow volume error
1. Detected by TC sensor
TC ≥ 68°C is detected in the heating or hot
water supply heat pump operation (except for
defrosting).
F33
2. Detected by flow rate
If the integrated circulation has been stopped
Pump starts operation, flow sensor status
"Water flow" is detected.
Compressor failure
1. If the operating frequency
drops due to the release of current
40 seconds or later following compressor
activation and stops when the frequency
drops below the minimum
H01
2. If the operating frequency drops due to
current limiting control and stops when the
frequency drops below the minimum
3. If an overcurrent was detected
0.8 seconds or later following compressor
activation
Compressor blockage
If the input current is greater than zero
H02
20 seconds or more after the compressor has
been started and the activation has not been
completed
H03
Current detection circuit defect
Backup
Automatic
present
reset
Heating
X
Check the connection of the temperature sensor of
X
Hot water
the floor inlet (TFI)
O
1. Check the connection (body or connection
O
O
2. Check the resistance value of the low pressure
3. Check the refrigerant circuit (gas leakage)
Check the value of the PD sensor with the remote
O
X
control
Replace the water-to-air heat exchanger control
X
X
board
Replace the water-to-air heat exchanger control
X
X
board
O
X
Heating
1. Check the flow sensor connection
X
0
2. Check the flow rate detected by the flow sensor
Hot water
O
- No or low water flow
- Flow sensor defect
Heating
X
X
Hot water
- Flow sensor defect
O
- Incorrect connection of flow sensor and low
- Check the water flow of the external pump
1. Check the power supply voltage
O
X
2. Overload of the cooling circuit
3. Check whether the service valve is fully open
1. Compressor defect (blockage)
O
X
2. Compressor wiring defect (open phase)
Replace the control board of the outdoor unit
O
X
inverter
Determination and measures
wiring) of the low pressure sensor
sensor
and the actual flow.
pressure sensor
(AC220-230 V±10%: 1-phase units)
(AC380-400 V±10%: 3-phase units)
- Replace the compressor
TOSHIBA I 45
I 45
TOSHIBA
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