That's what I thought it might be. My mate has got the same bolier, i'm going to swap that part over to see if that's what the problem is, but do you think that it might cause a problem in his boiler?
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.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local