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Does the boiler heat hot water? If so what happens when it does?

Sounds like the coil in the hot water cylinder has a hole. Water being heated in the cylinder has greater pressure than primary flow in the coil, the result the F&E tank fills.

No- give it a go.

If the actuator on the 3-port valve has always been on manual over-ride then the hot water cylinder has been heating up rather well for some time! It could be the cause for the noises. What model 3-port valve is it? Can you remove the actuator from the valve body? Some one you can without a...

Are those pump ball valves above and below the pump, as opposed to gate valves? Plumbers on here don't like pump ball valves as apparently they tend to leak when touched. Perhaps there are good ones out there these days?

If the drip is coming from the hose screw on connector then you need a replacement washing machine rubber washer (from screwfix in packs of 10 I believe). Easy to do for any hands on DIYer. If you fancy a go you must turn off the top valve before unscrewing the hose! Put down some old...

Can you set the CH timer to always on? Control when heating comes on / off with the thermostat.

You're right, x100 treats 10 rads. A double rad counts as two. If your boiler makes a kettling sound then try x200, otherwise don't worry. Your rad that gets cold on one side might indicate a system that's not balanced, is this rad on the ground floor and furthest from the boiler? If...

My way of thinking is, for what it costs and the result of not having it in the system it would be stupid not to put some in. X100 is what you want (up to 8 single panel rads), x200 if you have a limescale issue / noisy boiler. X400 goes in if you have a problem with rust (cold rads at the...

Ahh so this explains why I had slime after my system clean out! Thanks for the insight, makes a lot of sense now :roll:

Temperature difference between my first rad's flow and return is little, the lock shield is barely open and I get a high temperature. Try fully closing the lockshield and as the system warms up open it by a few degrees at a time until you get a reading. Aim for the 12 degrees but I can only...

The gas engineer expects a cup of tea / coffee and payment on completion :lol:

Try balancing the sysyem first. I bet the lounge rad is the last on the flow. The upstair rads hog the heat leaving the lounge rad with a low flow.

I had the same issue, I used Sentinal X400 cleaner 6months before. As a matter of interest, did you also?? To fix this I tied up the ball-cock, bailed out everything from the tank. Wiped with bleach, added Fernox Af10, wiped everything in and around with it, replaced the floater and refilled.

I take too long. I'll shut up.

I am suspicious of anyone that starts a sentence with "So". So, when the temperature on the boiler thermostat is met it will turn off, regardless off the room stat. If it didn't there could be a melt down or an explosion which would be rather inconvenient. With this in mind, if the rad in...

Is this the answer to your problem?

As 45yearsgasman says, if you are looking to collect lots of rust and crud you need to get as much of it out it in one go. May as well chuck in some Sentinel X400 or Fernox f3 for one month, then flush out. With system drained fit the filter. Are you going to DIY it? If so don't fit one...

My first extraction!