If you cannot find the exact manual, consider that many Polish controllers share the same logic. Manuals for the following models may be 90% compatible :
If you have physical access to the device, look for a sticker on the side or back – it often lists the exact manufacturer (e.g., "Made for Euroterm by...") and a full model code like C-275-SEI/Rev.2 . This will help narrow the search dramatically. euroterm c 275 sei instrukcja pdf
Open the gas and water valves. The electronic ignition will spark automatically when a hot water tap is opened. If you cannot find the exact manual, consider