Operating instructions
18
Troubleshooting
Diagnostics
Fault/
system characteristics
Cause Remedy
Burner does not start No voltage Switch ON the mains
electrical isolator
Safety chain activated Check all safety
equipment
Burner fault indicator
illuminates
Press the reset button at
the burner control unit
Fuel supply interrupted Open the shut−off valves
in the fuel supply line
and filter
Remedy other faults in accordance with the burner
manufacturer’s instructions
Oxygen corrosion
(water side)
Topping up with
unsuitable water
Check water treatment
system and injection
equipment in
accordance with VdTÜV
[or local] guidelines
Boiler is completely shut
down every day
Switch to standby
(95ºC) instead of a
complete shutdown
Flue gas temperature
too high
Heat transfer is reduced
by contamination on the
flue gas and water side
Clean the boiler
Rated boiler output is
exceeded
Check the rated burner
output
Turbulators missing or
incorrectly installed
Carry out maintenance
and installation in acc.
with page10 and 12
The safety valve
blows down
Blow−down pressure is
not identical with the
system pressure
Check the operating
pressure with a suitable
pressure gauge
Valve seat contaminated Clean the valve seat
Water trap pipe
(upstream of pressure
regulator) is clogged up
Clean pipes
5692729 GB