Sigma Holzgas, Manual And Installation

- 19 -

(8) Factory 

defaults 

The controller allows returning to standard settings set by the producer by 
choosing [Prod] and pressing OK button. After activating this function, the 
controller sets each parameter showed in the table.  
 

(9) Output 

testing 

To make checking the controller work easier, it is possible to test output circuits 
which control the fan and the pump, and the additional boiler launching system. 
This function is available in service mode, only if the control process is off, i.e. 
the controller was in STOP mode before switching to service mode. By 
choosing [outP] on the display and pressing OK button you can turn on the 
central heating pump for a while, by choosing [out

Π

] and pressing OK you can 

turn on the fan and by choosing [outr] and pressing OK you can turn the 
additional boiler on (if the additional module is connected). Choosing [outu] 
allows testing the hot water pump output. 
 

(10)  Exiting service mode 

By choosing [End] option on the display and pressing OK button you can exit 
parameter setting mode.  
The controller also exits service mode, when no buttons are pressed for 1 
minute. 
 

6.2.6)

Additional functions 

To improve comfort in heated rooms, the controller has been equipped with an 
input that allows connecting any kind of room thermostat with contact output. 
When temperature in the room is below desired temperature, the central 
heating pump is turned on and the room thermostat indicator is lit.  
It means that the boiler should keep temperature set by the room thermostat 
knob. After reaching desired temperature in the room, the room thermostat 
indicator turns off, the central heating pump is turned off and the boiler switches 
to mode in which it keeps burning at minimum temperature. 
 

CAUTION

. In case of not having room thermostat in the system, the room thermostat input 

contacts must be short-circuited. 

6.2.7)

Controller failures 

The controller is constantly testing if its internal circuits and temperature sensor 
are working correctly. After detection of fault, it stops the fan, turns on the 
central heating pump and shows proper error message on the display. In case 
of failure please turn off the controller, plug the central heating pump to the 
power source, ensure appropriate fuel firing in the boiler and contact the 
service.