TROUBLESHOOTING
27
7.4.
Basic service procedures
7.4.1.
Service after overheating
If overheating occurs, the safety valves of the boiler must open. Make sure the boiler pump is
working. In case of blackout, the burner will stop operation and the temperature will soon fall.
Open some valves of the system if necessary to decrease the boiler temperature faster.
All safety devices must lead to drainage! After overheating, make sure that all the water from
the safety devices has drained, and the system has filled with cold water. Check the pressure
and the temperature of the boiler.
At overheating, the safety thermostat will activate, and cut electrical supply to the burner. In
that case, you need to manually reset the safety thermostat and put the system back in
function. Unscrew the plastic cover of the safety thermostat and press the switch. Put the
plastic cover back.
Verify the causes of the overheating! If it happens again, check the installation
and function of the pumps and safety devices!
8.
TROUBLESHOOTING
Problem
Cause
Solution
The lamps of the
control panel do not
light
- no electrical supply to the lamp
- the control panel is not
connected to electricity
- lamp defect
- electric cable defect
- check/replace the lamp
- connect to electricity
- check/replace the cables
The boiler does not
reach set
temperature
- fan blocked
- air passages are blocked
- boiler is not cleaned
- incorrect boiler start-up
- insufficient water in the system
- too big pump debit
- boiler under dimensioned
- bad quality fuel used
- insufficient chimney draught
- check/replace the fan, check
the function of the fan regulator
and thermostat
- clean the air passages
- clean the boiler
- start the boiler correctly
- fill the system
- regulate the pump speed
- change the fuel used
- check/clean the chimney
High temperature in
the boiler, but low
temperature at the
radiators
- too high hydraulic resistance in
the heating network
- thermostatic mixing valve is
connected wrong
- increase the pump speed
- check/replace the mixing valve
Condensation
formation in the fire
chamber
- too big boiler power
- too low return temperature in
the boiler
- fuel with excessive humidity
- load less fuel in the chamber
- install a return protection
system/thermostatic valve
- change the fuel used
Smoke coming out of
the doors
- boiler doors not regulated
- defect sealing cord of the door
- insufficient chimney draught
- too high air supply by the fan
- regulate the doors so that the
sealing cord stays tight
- check/replace the sealing cord
- check/clean the chimney
- reduce the air speed
The fan does not
function or it makes
a lot of noise
- set temperature reached
- disconnected by safety
thermostat
- capacitor/motor defect
- bad electrical connection of the
fan
- correct boiler function
- reset manually
- check/replace the fan
- check the electrical connection
of the fan
