Hot water only comes on when numerous taps are running

5 Jan 2008
Reaction score
United Kingdom
Hi Guys.
I have a Baxi 105 HE.
We have an issue where the boiler doesn't come on for the hot water.
It does come on when you turn both the basin and bath taps on to full flow.

I assume there is a flow valve/switch that detects when the water is flowing.

My questions are:
1. Where is it on the boiler?
2. Can it be fixed by me (I am having the full central heating system looked at and probably replaced in about a month.
3. How much would it cost for parts and labor if I was to get it done by someone?
4. Is it safe for me to change my self (as I am not messing with gas components?

Thanks in advance
Last edited:
Sponsored Links
search for diaphragm and venturi on this site and there is numerous explanations on how to repair its a realtively simple repair if your mechanically minded both parts 15 quid each max.
nothing to do with gas so ok to do
and you managed to fish the spring out target they can be a nuisance to get out
Sponsored Links

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local