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Hi Cannot see any additional switches/valves - it is a sealed unit with no other accesses. Cannot see any way in to the unit, the door of the casing comes off exposing the metal of the boiler housing and the bottom hinge door opens to access the control knobs, no other access or switches...

Hi Nothing happens when only Hot Water is on, the power light is only light on. Turn on hot water tap, just keeps running cold..... G

Hi, It fires up when you turn the system on and stays on whilst all the radiators heat up. But the little light next to mixer tap symbol stays off, all other lights are on. So even when the heating goes on, the flames in the boiler are going, the water stays cold. G

Hi Tony, I would have, but there is no marking or identifier on the housing or the boiler itself, nor a handbook. Have checked ever visible side of it. It is a galvanised metal boiler unit, the lower section is black plastic an houses the dials/guage. It has one 4 green plastic dials...

Hi Anyone out there who would know about a fault with a Vaillant boiler. Runs cental heating and hot water, only all of a sudden the hot water is not working? Heating is fine, radiators fine, flame kicks in fine when turned on etc, except no hot water? Any ideas? Gord