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I have a Vaillant Eco plus 428 condensing boiler. Lately the hot water doesn't heat up but the radiators get hot instead even though the c/h is switched off. Also, the boiler has become very noisy.

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6ya6ya
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Posted on Jan 02, 2017

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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

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  • 13 Answers

SOURCE: hi,i have a vaillant turbomax

Which turbomax, as there a two different models. The more modern one, with the brass CPL diverter valve, located at the front left of the boiler, was very prone sticking & jamming, this would restrict flow through the hot water circuit in the boiler, and cause cycling. Vaillant actually modified the diverter. You can identify, if it is the old type, as there is a very small hole in the middle of the diverter on the old ones, probable no more than 1mm-2mm wide. The modfied one, is much bigger approx 5mm wide. If old type, replace as this usally sorts the problem

Posted on Mar 03, 2009

  • 1 Answer

SOURCE: Vaillant boiler - heating OK, but no hot water.

Most likey problem is the diverter valve, not energising fully. This in turn will not move the little plastic lever arm that actuates the microswitch on the side, sending the signal to ignite.

You can buy a diaghram kit from most local plumb centres, you need to replace the diaghram and seals, don't forget the silicon grease to ensure the plunger doesnt stick. Kits less than a tenner.

You should have noticed before it stopped working completely the water had reduced in temperature before the weeks it failed.

To make sure it is a diverter valve fault, depress the microswitch if you can, when the hot water is flowing and hey presto the demand for hot water light should shine.

Posted on Apr 26, 2009

  • 1 Answer

SOURCE: Step by step instructions on how to refill the

water pressure keeps coming down

Posted on Dec 19, 2009

  • 36 Answers

SOURCE: hot water only warm no faults showing radiators ok

you need a new dhw thermistor

Posted on Jan 24, 2010

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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.

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