Central Heating issues / Boiler Service (Barry Road)

[dougiefreeman]

We are having some issues with our central heating.

The system is noisy with lots of crackling and gurgling in all of the rads as the boiler fires up (particularly from cold in the night). We live in a ground floor 2 bed flat on Barry Road. There are just four rads.

I have bled all the rads several times but not really any air came out - there are no cold spots.

The water that comes out though is quite fizzy so I’m assuming that means there are lots of small bubbles of air trapped in the water. From reading the suggestion is a system drain or a flush.

The boiler is a Worcester Junior 24I mk4 and it was last serviced in 2020.

We have had times (although oddly not recently) where the boiler bangs after it’s been on for a while.

We have also had vibration problems which I believe is caused by two of the rads having had the thermostatic valve installed on the return end rather than the flow. It wasn’t an issue until we swapped the thermostatic valves for hive valves. The hive valves clearly have finer increments on how open they can be because when the valve is nearly at temp, the rads rattle like crazy.

The return valves are leaking on both of those radiators also.

Looking for a rough estimate for:

1. Swapping the valves around on two radiators

2. Drain or flush of the pipework

3. Boiler Service

And anything else that you think it might be?

And also a rough idea of availability..

Many thanks