Your boiler's control panel and its internal computer are not talking to each other, meaning the unit cannot receive instructions to provide heat or hot water.

NocommunicationwiththePCB: CommunicationfaultbetweendisplayandPCBintheelectronicsbox

What causes this fault?

This fault occurs when the data link between the boiler's control screen and its main internal computer is broken or interrupted. The most common reason is a loose wiring connection or a component failure caused by a power surge or natural wear and tear. Without this communication link, the boiler cannot process your heating requests and shuts down for safety.