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<blockquote data-quote="Channel Hopper" data-source="post: 18017" data-attributes="member: 175144">Got a boiler (Saunier Duval 620) that is refusing to produce hot water, for the past two days. When I run the hot tap the vent opens, but there is no gas sent to the butnerIt provides heat for the central heating fine (so the gas must be running OK - not that I would touch it ) and on winter setting, if I turn the room thermostat right up, warm water will come out of the tap, but this is probably due to the conduction of heat inside the boiler.I have a spare boiler in the shed but do not know what part inside the fitted one has failed, or what it would look likeIs it likely to be a pressure sensor (the drop of water pressure caused by an open tap turns the gas on ), or an electrical (flow) sensor What am I to replace without calling in someone who will have to order a part and wait three weeks for delivery, even though Ive got all the parts needed ?Help appreciated as the wifes not happy.</blockquote>

[QUOTE="Channel Hopper, post: 18017, member: 175144"] Got a boiler (Saunier Duval 620) that is refusing to produce hot water, for the past two days. When I run the hot tap the vent opens, but there is no gas sent to the butner It provides heat for the central heating fine (so the gas must be running OK - not that I would touch it ) and on winter setting, if I turn the room thermostat right up, warm water will come out of the tap, but this is probably due to the conduction of heat inside the boiler. I have a spare boiler in the shed but do not know what part inside the fitted one has failed, or what it would look like Is it likely to be a pressure sensor (the drop of water pressure caused by an open tap turns the gas on ), or an electrical (flow) sensor What am I to replace without calling in someone who will have to order a part and wait three weeks for delivery, even though Ive got all the parts needed ? Help appreciated as the wifes not happy. [/QUOTE]

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