no hot water upstairs, combi.

3 Feb 2012
Reaction score
United Kingdom
Hi, popped round a mates whos having probs with hot water upstairs. Downstairs hot water is fine. But in upstairs bathroom, bath hot tap runs hot for a min, then cold. Basin shower taps do not get hot, neither does thermostatic shower. Boiler is a vaillant turbo max combi. I cannot figure out whats wrong. No error codes. But pressure on CH gauge showing as 2.5 bar, even though its not running.
Sponsored Links
Anything changed recently, ie is this a new bathroom? Is the boiler downstairs? What's your flow rate out of taps at upstairs bathroom?
CH pressure is high, should be in the 1>1.5 bar range, DIY fix is open a bleed valve on a radiator and reduce pressure. When the bath hot water upstairs is on, does the boiler cycle on and off? As 1983 mentions, it may be a flow issue
Thanks for replies lads. Whats the best way to measure flow rate. If i remember rightly, the water was flowing ok, although flow didnt seem powerful. However it seemed enough to get the boiler fired up.
Sponsored Links
time filling a bucket in the bath/fill sink over 60 secs, measure how much water, that = Ltrs/min. If too much water time it for 30secs and multiply by 2.
Turn the upstairs tap on and see what the boiler does, is it going on and off ?

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