Mechanical timer not turning and no audible noise to suggest it's turning on its own. Done a power cycle and can't find anything in the setup guide. It's an ideal Esprit eco2
VAILLANT TURBOMAX PLUS & ECOMAX 824E 828E 824/2 828/2 E TIMER CLOCK 306701 – BoilerRecycling
Vaillant Part No: 0020116882 | timeSWITCH 150 Analogue Timer | 24 Hour Delivery | Heating Spare Parts
Auto set combi boiler heating/ clock timer using pins as clocks go forward/back - YouTube