19
Fault
Cause
Action
Burner does not start.
No power
Switch ON the mains isolator.
Safety chain activated.
Check safety equipment.
Burner fault indicator illuminates
Press reset button on the burner
control unit.
Fuel supply interrupted
Open shut-off valves in the fuel sup-
ply line and filter.
Remedy other faults in accordance with the burner manufacturer's in-
structions.
Oxygen corrosion (water side)
Topping up with unsuitable water
Check water treatment system and
injection system in accordance with
VdTÜV guideline.
Boiler is switched off every day.
Switch to standby (95 °C) instead of
a complete shutdown.
Excessive flue gas temperature
Heat transfer is reduced by contam-
ination on the flue gas and water
sides
Clean boiler.
The rated boiler heating output is
exceeded.
Check burner heating output.
Turbulators missing or incorrectly
fitted.
Maintenance and installation: See
page 12 and 14.
Discharge from safety valve.
Discharge pressure does not match
system pressure.
Check the operating pressure with a
suitable pressure gauge.
Valve seat contaminated
Clean valve seat.
Water trap pipe (upstream of pres-
sure regulator) clogged up
Clean pipes.
Boiler produces wet steam
Excessive boiler water alkalinity
Regularly blow-down the boiler and
install a TDS unit if required; treat
water according to EN 12953. Drain
the downstream steam line.
Water level set too high
Check boiler water and feedwater
daily. Check electrode length.
Steam knocking inside boiler
Feedwater not fed in at the feedwa-
ter connector
Connect feedwater line to the correct
connector.
Steam knocking inside the conden-
sate tank
The check valve in the feedwater
line is missing or faulty.
Install or clean check valve (observe
flow direction)
Steam trap in the system is faulty.
Identify and repair faulty steam trap.
U-bends buckle
Reduce steam pressure.
Boiler water level too high
Steam distributor above the boiler is
not adequately drained.
Install a steam trap.
Troubleshooting
Diagnostics
5692729
Diagnosis
