Instruction manual
17 
Functions and text display at heating-up or refuel
After pressing the button “+” (see button 5 in chap. 1.3), starts the process that includes following 
steps: 
- The boiler is switched on; control light 1 shines; the ignition mode runs. 
- Display shows text: 
DO NOT OPEN! 
PLEASE, WAIT 
- The exhaust fan and the combustion control are switched on. 
- The loading pump, the return- and loading valve regulation are switched on. 
- The alternative energy generator is deactivated by means of an automatic change-over contact. 
- After 5 sec. appears the text is displayed: 
FILLING DOOR UNLOCKED 
  and the electromagnetic door lock (if available) is released for 10sec. 
- After 10 sec. appears the text on display: 
CAUTION! 
Open slowly! 
- After 5 sec. appears the text on display: 
Heating-up 
▌▌▌▌▌▌▌▌▌▌▌▌▌▌ 
Prepare and ignit the fuel as it is given in the manual on the page 11, shut the feeding doors! 
- If the (firing) bar is full and the filling and firing up is finished, close the doors. 
- If the bar is full or the firing or filling process exceeds 15 minutes, it is switched to the operation 
display. 
- The controller switches off the boiler after 15 min., if: 1) was not fired, the controller, however, 
start the burning mode because of mistaken actuation with the key “+”; 2) the fire goes out after 
doors were closed because not enough kindling was used or too wet fuel was loaded. 
Operating mode display while the boiler is switched on 
The text is displayed: 
Boiler temp. 
[°C] 
After 5 sec. appears the text on display: 
Exhaust temp. 
[°C] 
  This text is displayed every 5 sec. 
Too high exhaust temperature 
If the exhaust temperature increases to ≥ 300°C because the  filling-, cinder- or firing door were 
opened for too long time, appears the text “Exhaust temperature too high“ - (see display). In this 
case please: 
Close the door(s) immediately! 
If the exhaust temperature exceeds 350°C, the exhaust fan is switched off for safety reasons; when 










