De Dietrich Gas Boiler Trouble shooting

The unit does not start, but the program block is in normal mode (the red fault indicator does not light).

 

The thermostat is not in the heating request. The control system (optional equipment) is not in the heating request - Call up the heating request by operating the unit thermostat or control system (optional equipment). Due to overheating, the safety thermostat has disconnected - Eliminate the cause of overheating and reset the safety thermostat. No power - Set the mains switch to on.

 

The burner does not light up, and the program block is locked (the red fault indicator is lit)

 

Setting in the lockout mode due to lack of gas - Clean the gas supply line, and then press the fault reset button on the control panel. Defective gas valve of the 1st stage - Check the gas block and, if necessary, replace it. No spark on the electrode - Check the electrical cable connections to the software unit and to the electrode. Transition to blocking mode due to the opening of the traction sensor - Check the good draft at the location of the chimney. Press the manual reset button of the program lock. No ionisation current - Check the connection of the ionisation sensor and the ground wire. Check the position of the ionisation sensor and ignition flame distributor. Clogged filter or nozzle of the pilot burner - Clean the filter and the nozzle of the pilot burner.

 

The burner ignites and the program block is locked (the red fault indicator is lit)

 

Switching off the TAF - Check the good draft at the connection point of the chimney. Perform a manual reset of the program lock. Check the condition of the traction sensor. Perform a manual reset of the program lock.

The burner ignites, but with less power

 

Low inlet pressure - Check the gas supply.

Dirty filter - Clean the filter.

Defective gas unit - Replace the gas block.

Defective gas unit - Check the gas block and replace it if necessary.

Incorrect nozzles and / or diaphragms - Check them.

 

The contaminated cast-iron heat exchanger of the boiler De Dietrich (furnace side)

 

Inlet pressure too high - Check the gas supply.

Contaminated burner - Clean the burner.

Inadequate or poorly located ventilation of the boiler house - Increase the ventilation openings, clean them. Defective gas unit - Check the gas block and replace it if necessary.

 

The unit is noisy

 

Poor air removal - Remove air properly.

The heat exchanger is coated with limescale. - Descale the heating circuit.

Incorrectly selected nozzles (Whistle) - Check the nozzles.

 

The boiler is too hot or too cold in relation to the heat demand

 

Three-position switch in manual position - Check the position of the three-position switch. Incorrect thermostat setting - Set the thermostat to the maximum value if the unit is equipped with a regulation system or room thermostat.

 

Flame attenuation

 

Too large or small nozzles - Check nozzles and pressure.