68
10.
OPERATION PROBLEMS
Electrical power failure
In case of power failure during operation and the return of supply, the control unit will check the boiler
status and temperature.
The pumps continue to work to prevent system overheating and to cool the boiler. If the flame
temperature sensor has received a signal that the temperature in the combustion chamber is high, a
fan is switched on to burn the remaining pellet in the combustion chamber and if the temperature
continues to rise the boiler continues to operate.
If the temperature is not high enough and the sensor detects a temperature fall, below the default, the
fan will work until the remaining pellet burns and then clean the burner grid. If the programmed time
is active, the boiler will restart.
Overheating
If the boiler temperature reaches the limit of
90 ° C
, all pumps in the system will start to cool down the
boiler. If this does not help and the temperature raises up to 95 ° C, the
safety thermo switch
(STB)
will be activated by sending the signal to control unit, the display shows BOILER OWERHEATING /
STB ACTIVATED and the boiler stops working.
The switch is located on the side of the boiler and is in black color. To reset it, first wait for the boiler to
cool down, unscrew the plastic cap and use a suitable tool to reset the switch. After that, it is possible
to restart the boiler.
