| Option/ Additional Information |
Possible cause | Remedy |
|---|---|---|
| Combustion air intake and exhaust lines kinked, clogged or incorrectly routed | Correctly route combustion air intake or exhaust line and check for unobstructed passage | |
| Incorrect installation position of dosing pump | Install dosing pump in permissible installation position in accordance with installation instructions | |
| Insufficient amount of combustion air | Set CO2-value to permissible value in accordance with the workshop manual | |
| Burner insert incorrectly mounted, or burner matting worn | Inspect burner insert, replace if necessary and install new one in accordance with directions contained in workshop manual |