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I have a baxi duo-tec 40kw combi my problem is the hot water keeps running hot and cold at the tap. when at the boiler the boiler stat is turned to 60 degrees it will, when fired go past the 60 mark and go up to 80-90 degrees and shut down.what could be the problem?

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6ya6ya
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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: I have a potterton 80

I found the valve to increase the water pressure and the boiler is now working.

Posted on Aug 06, 2008

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zeusfaber
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SOURCE: Vaillant Ecotec combi boiler -

David,

The fact that you're getting a little burst of domestic hot water suggests that the boiler is capable of circulating hot primary loop water through the heat exchanger, but doesn't necessarily do so when it needs to.

What seems to be lacking is a recognition that domestic hot water is now being drawn off, and that the boiler needs to fire up and divert the primary flow through the heat exchanger.

A good place to start might be the flow switch (usually in the bottom of the boiler, where the cold water supply comes in) or the electrical connections to it.

A.

Posted on Oct 07, 2008

  • 104 Answers

SOURCE: Combi Boiler - Running warm & then cold!? HELP!

mixing valve must be replaced

Posted on Nov 02, 2008

  • 3 Answers

SOURCE: combi cutting out and overheating

is this a baxi 105? chances are you diaphragm has gone on your diverter valve. Or your diverter valve.
Do you will initially get a liitle hot water if your heating is on?

Posted on Dec 30, 2008

  • 1 Answer

SOURCE: hi,i have a vaillant turbomax

I had this. Open up the main case, take the second inner case front off to expose the boiler.

Clean the thermocouple which detects the flame being lit with some steel wool held with needle nose pliers. It will be all sooty and will turn off the gas as a safety precaution if it does not detect heat fast enough.

Don't listen to the gas man who will say "needs a new circuit board mate" as this is usually a stock response.

Posted on Jan 05, 2009

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