In the event of a malfunction, the appliance applies a Safety block or Safety stop, depending on the type of error/fault
that has occurred, as signalled on the DSP display.
Errors with safety block
The table below lists the errors/faults that generate a Safety Block.
To restore normal operating conditions:
- Disconnect the electrical and gas power supplies from the appliance
- Eliminate the cause of the fault
- Restart the appliance.
Display items
Meaning
Failed ignition
Error 1 The flame has not been ignited within the appliance safety interval, 3
times consecutively
False flame
Error 2
False flame detection
High Boiler Temperature
Error 3
The appliance safety thermostat has tripped due to high temperature
Blower speed
Error 5
The blower speed has not been detected
Flame circuit
Error 8
Flame detection (circuit) error
Gas valve circuit fault
Error 9
Gas valve (circuit) error
Error 13
Repeated errors exceeding 5 manual resets in less than 15 minutes
Also in this case, turn the appliance off and on again to reset.
Internal control fault
Error 21
Fault on internal equipment/board
CRC connection
Error 25
CRC connection error
Supply sensor shorted
Error 30
The supply sensor has detected a temperature
outside the admissible range (equivalent to short circuit)
Supply sensor open
Error 31
The supply sensor has detected a temperature
outside the admissible range (equivalent to short circuit)
Return sensor shorted
Error 43
The return sensor has detected a temperature
outside the admissible range (equivalent to short circuit)
Return sensor open
Error 44
The return sensor has detected a temperature
outside the admissible range (equivalent to short circuit)
Errors with safety stop
The table below lists the errors/faults that generate a Safety Stop.
To restore normal operating conditions:
- Disconnect the electrical and gas power supplies from the appliance
- Eliminate the cause of the fault
The appliance restarts automatically on the first heat request.
Display items
Meaning
Error 7
Flue temperature over limit
ΔT Supply/Return high
Error 11
ΔT Supply/Return > 5°C for at least 5 seconds, on stand-by,
measured continuously
Error 15
On start-up: (Supply T. - Ret. T.) > 3°C
Error 16
On start-up, the supply T. does not vary by at least 1°C
Error 17
On start-up, the return T. does not vary by at least 1°C
Error 18
General sensor error, reading off scale
DHW sensor shorted
Error 32
The DHW sensor has detected a temperature
outside the admissible range (equivalent to short circuit)
DHW sensor open
Error 33
The DHW sensor has detected a temperature
outside the admissible range (equivalent to short circuit)
Low voltage
Error 34
The mains voltage is low (V<230-15%)
Low water pressure
Error 37
The water pressure switch detects/signals low pressure
Water pressure error
Error 41
The frequency of water pressure update is insufficient
Flue sensor shorted
Error 45
The flue sensor has detected a temperature
outside the admissible range (equivalent to short circuit)
Error message
DHW sensor open
ERROR 33
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