Ideal isar combi stuck in DHW, won't fire?

Hello

Does anyone know much about Ideals?

Mine is stuck in dhw, it isn't firing (no fan no pump either). There is no DHW demand, all taps off, no leaks anywhere, pressure OK.

As it's stuck in DHW it won't acknowledge a CH demand either, so no heating and no hot water.

Any advice much appreciated (anyone know how much Ideal charge for a visit?)...