Error E01 – The flame sensor is responsible for this fault
Lack of air
Faulty gas valve
No gas
Defective, corrupted or incorrectly installed flame monitor
Loosely attached coaxial chimney
Faulty ignition system

Error E02 (02E) – Overheating protection thermostat
Inadequate circulation of coolant through primary heat exchanger
Excess of water in main circuit
Absence of a good contact between the heating circuit and the temperature sensor of the coolant
No contact between board and overheating thermostat
Defective thermostat overheating

Error E03 (03E) – This error is diagnosed by pneumatic relay (thrust sensor).
Fault Pneumatic Relay – Traction Sensor
No contact between board and fan
Pipe connection for pneumatic relay
Water enters the pipe connecting the pneumatic relay with the pneumatic device
Chimney or chimney flue gasification
Defective fan
Exceeds the maximum chimney length

Error E10 (10E) – minimum pressure switch
Defective minimum pressure switch for heating circuit
Insufficient water pressure in the heating circuit
There is no contact between the minimum pressure switch of the board and the heating circuit

Error E06 (06E) – DHW Temperature Sensor
Defective electronic board
DHW temperature sensor is faulty
There is no contact between the board and the DHW temperature sensor

Error E05 (05E) – heating circuit temperature sensor
Defective electronic board
Defective heating circuit temperature sensor
There is no contact between the board of the heating circuit and the temperature sensor

Error E04 (04E) – Flame Monitor Electrode
Defective electronic board
Poor exposure of flame monitoring electrodes
Unstable voltage in the network
Flame monitoring electrode is dirty
Chimney work

Error E25 (25E) – Temperature sensor of heating circuit
Heating system is inflated
Defective heating circuit temperature sensor
Pump obstruction is possible

E25 (25E) error – DHW and DHW temperature sensor
Presence of scale in birthermal heat exchange. Required to replace or flush the heat exchanger

Error E35 (35E) – Flame Monitoring Electrode
Moisture on Boiler’s Electronic Board
The presence of a flame stops after the burner – a parasitic flame

Error E96 (96E) – an electronic board
Low voltage in the mains, it is necessary to install a voltage regulator