V

1. Open the main shut-off valve.
2. Open the device shut-off valve.
3. Interrupt the power supply of the appliance and check the gas line.
4. Carry out function check for ionisation.
5. Connect the plug for the ionisation and ignition sections correctly.
6. Establish protective conductor connection (PE) in the control device.
7. Check flame sense electrode, replace if necessary.
8. Check ignition electrode, replace if necessary.
9. Check ignition electrode connecting lead, replace if necessary.
10.Check flame sense electrode connecting lead, replace if necessary.
11.Set the burner correctly/replace the burner nozzles.
12.Set the burner at minimum rated load.
13.Check air/gas ratio control valve, replace if necessary.
14.Check the flue system and repair if necessary.
15.The interconnected room air supply is too small or the size of the ventilation opening is too small.
16.Clean the heating block on the flue gas side.
17.Check control device/burner control unit, replace if necessary.