Preesure drop

Joined
11 Jan 2008
Messages
23
Reaction score
0
Location
Yorkshire
Country
United Kingdom
I have a Worcester greenstar CDI 42 combi boiler.

It was just been serviced 2 weeks ago and is one year old.

I am getting a .75 bar drop in pressure between hot (88C) and cool (48C). Is this normal (acceptable) because I do not remember this happening prior to the service?

Thanks
 
Sponsored Links
As long as it settles at the same point then it should be OK... Your expansion vessel charge may need checking though as a .75 pressure rise is a little excessive...
 
Thanks. I had my suspicions about the expansion chamber. I got the same guy (Worcester-Bosch) back again after the service because it wasn't happening before and he claimed the boiler was A1. What, apart from the boiler can cause this discrepency?

Thanks
 
Sponsored Links
As long as it settles at the same point then it should be OK... Your expansion vessel charge may need checking though as a .75 pressure rise is a little excessive...[


It`s a pressure drop, not a pressure rise as the system cools it will drop. :LOL: :LOL: :LOL: :LOL:
 
Depends whether your starting point is hot or cold.


A drop from hot is contraction/cooling and is perfectly normal - as is a slight rise from cold.. A drop from cold would be a leak and not what the OP reported.
 
and... :?:

OP is saying the pressure goes down as the boiler cools.

So, for example.

When cold the boiler is sitting at 1 bar. It heats up to 88 degrees and the pressure goes to 1.75.

As the boiler cools again the pressure returns to 1 bar.
 
ex vessel and prv then cliver


if it was ex vessel then the boiler would show it to be over pressurised probably around 3 bar immediately :rolleyes: , if it was the prv then it would indeed be losing pressure via the blow off, easy to check innit....Basically what I am saying is: his boiler is performing exactly the way it should be and there is no problem.. ;)
 

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

 
Sponsored Links
Back
Top