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So is that a yes or a no...?!!!

Can a small amount of X400 be added to the heating system and left in on a permanent basis to help circulation? If so, what amount would be ok?

There has been a slight change! The boiler has started to fire for a few 3 and a half minute bursts, after its initial 10 minute firing, before it defaults to its problematic 10 second cycling. Has it started to self heal???

The pipework has been in place for over 20 years! I think the problem is either an airlock or a failing pump. I had a look at the 'finger test'. but cannot see any real access into the pump, just a bleed screw that doesn't come all the way out. It is a Circulating Pumps CP53. Can this be...

I am not a landlord! Is there not a way I could attempt to clear this? Obviously with some expert advice! Thanks

When the boiler is firing, it does sound like there is a fair bit of water slushing around. Would this indicate some form of airlock? The boiler is in the airing cupboard, with the tank in the loft above. There is a drain off point in the cupboard. If I were to drain off from here, would this...

Hi, thanks for the advice. Which boiler stat do you mean? I still think this could be a pump issue.

I have checked around the pump with a magnet but nothing seems out of the ordinary. The pump is a Circulating Pumps CP53 and is about 8 years old. Appreciate this is a budget pump! About 18 months ago I had the system flushed with Sentinel X400, and it has not had a circulation problem till...

Thanks for the advice, I will source a magnet to check. Is there a simple way to check if the pump is failing?

Ok, how can I rule out a failing pump? If there is an airlock in the boiler, how is this removed? It does sound at times like there is water slushing around in the boiler when the water is being heated, is this the symptom of an airlock?

It is cycling on both the hi and lo settings, both on hw and ch. All the rads just about heat up in the 10 mins or so the main burner fires for, but after that the boiler just cycles.

I am getting 240v at the pump throughout, so it does nit sound like the pump over run stat. Could it be a faulty overheat stat, or would this cut the pilot light? Is there any way to test the pump, to see if it is failing?

Is there a simple way to check this other than a visual? If the overheat limit stat was faulty, could it cause this, or would it extinguish the pilot light?

If it is a circulation problem, why does it cut out after 10 minutes? Is there a simple way to test the pump? It does sound like it is running throughout.

I do usually run it on the low setting, but tried the high to see if it behaved any differently. The pump sounds like it is running.

The boiler fires up on the main burner for about ten minutes, then cuts out, then fires up for about 10 seconds, then cuts out, then fires up for 10 seconds and so on. Obviously the pilot light stays on throughout. It does this cycling on both Central Heating and Hot Water, and on both the Low...

Fair comment, but is it worth trying to replace a stat, before I replace the boiler? It does not bang when heating the water, so does that rule anything in or out?

Thanks for reply. It only starts when everything is hot. I only use the boiler on the 'low' setting, so it could be the Low stat. Is there a chance it could be the pump over run stat? I am not sure if the over run stat could cause this.

My vintage Myson Apollo 15/30 boiler has started to make some loud banging noises. This happens on the central heating cycle after about 40mins, when everything is at full temperature. It bangs loudly about 5 times. I have bled all valves, and the water in the header tank appears ok, but the...

An interesting find. Would be keen to know if Fernox or Adey are planning a new or revamped filter, or if this one, being the newest, is the one to get.