Hot Water Problem

[stocktonlad]

Hi,

For about the last week we have been having trouble with the combi boiler.

When you run the downstairs kitchen sink hot tap or the bathroom vanity sink hot tap we get no hot water. The boiler makes a humming noise and nothing else, the water runs cold. However, when you run the bath hot tap or the utility roon hot tap the water gets hot.

The heating system is unaffected and works fine.

The boiler pressure is about 1.8

Any idea.

John

 

[picasso]

What combi boiler, make ? model ? white box on wall ?

 

[Dan Robinson]

Shall I get my clairvoyant hat on?

What boiler is it?

 

[stardanny]

What boiler is it?

Does it display any when running hot water to kitchen sink, try open fully, see what happened?

Dan.

 

[stocktonlad]

It's a Baxi combi 105 HE

When running the hot taps that don't work the burner light does not light.

The bath hot tap makes the boiler run normally

 

[Dan Robinson]

First guess would be a small hole in the DHW diaphragm. Easy fix.

 

[stardanny]

Might be a DHW flow valve fault as it not opening fully to switch on. Reckon it's the diaphragm.

Dan.

 

[stocktonlad]

http://www.ebay.co.uk/itm/Baxi-Comb...&ps=63&clkid=138806067173564069#ht_3428wt_689

Something like this?

 

[stocktonlad]

Is that the correct part?

 

[sooey]

Yes

Joined april 2004 you must be one of the longest registered on here.