Heating water from hot tap

[lazza]

Hi all, just moved a radiator from one wall to another, straight forward job, heating is working, problem is that on turning on a hot water tap the water coming out is heating water ( Fernox smell)and the boiler pressure drops quite quickly. Baxi Platinum 28HE. Any help or ideas please

 

[ShaunCorbs]

Time to get a gas engineer sorry to say sounds like the exchanger has gone heating side

Does the boiler over pressurise ?

 

[lazza]

Time to get a gas engineer sorry to say sounds like the exchanger has gone heating side

Does the boiler over pressurise ?

No seems to be ok with just heating on, just when a hot tap is used the pressure quickly decreases and heating water comes out of tap

 

[Ben-gee]

That is probably because the heating system is at a very similar pressure to the mains. So with no hot tap open the system is fairly stable; but as soon as a hot top is opened the pressure on that side of the heat exchanger drops and this allows the heating system water to cross into the hot water system and de-pressurise the heating system. It sounds like Shaun has got the answer for you.

 

[PETE 123]

Filling method taps open?

 

[lazza]

That is probably because the heating system is at a very similar pressure to the mains. So with no hot tap open the system is fairly stable; but as soon as a hot top is opened the pressure on that side of the heat exchanger drops and this allows the heating system water to cross into the hot water system and de-pressurise the heating system. It sounds like Shaun has got the answer for you.

Ye, time to get the professionals in, thanks

Filling method taps open?

No, solid link filling, both taps off, thanks