I have Vaillant combi boiler and very strangely I get a maintenance signal but no fault code. Has anyone met with the same.
When you get a maintenance signal (the open-ended spanner) without a fault code that means something in the boiler (maybe more than one thing) needs fixing. In this case, you need to select the Live Monitor section from the menu to check the overall status of the boiler. Open the main menu by pressing the two selection buttons together or you can get it through the screen.
The live monitor includes the status code for each condition and a clear text message of what it means to avoid any confusion. It also updates automatically with any changes in the boiler so you can regularly check the boiler status to reassure nothing goes wrong.