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Thanks, and yes valid point, I did that 2 years ago, however the water in the whole system was pretty black this time.

Thanks, I'll run it for a couple of weeks then check water.

Good advice thanks SGM. Well I did the bottle trick with the gas out the radiator, which I'd left over night & it did "pop", so i think it's quite conclusive that it's a build up of Hydrogen gas overnight due to excessive corrosion products in the water/radiators. I've drained & flushed the...

Thanks, I captured some of the gas in an old beer bottle when bleeding this afternoon, and there was a definate "whoosh" (not a pop) when I stuck a long lighter into the neck. I'm going to do it again tomorrow just to be sure. Ps; yes, I've bled the pump too. If the gas ignites or pops...

Deary me, I've no idea why posts in this section gets so animated & people getting uptight & angry. It's supposed to be a help forum. I only popped on to get some advice, not to start another flame war on here. I'm quite comfortable using the term gas, and as a charted engineer, (in case you...

At last a helpful reply. Much appreciated, I'll do that tomorrow. Thank you.

I dont, and I've purposely used the term gas, as air is also a "gas".

Some advice please; I've a Potterton Promax Fsb boiler and an open vented system which is suffering from excessive gas in 2 towel radiators. I've established that the system needs drained, flushed & refilled with inhibitor, as the Magnaclean filter was quite heavily contaminated with black...

Thank you, we have our uses. :-)

Thought I'd update the outcome for other "DIYrs" who may happen upon this thread; Whipped the DHW microswitch off, stuck a meter on it, was only operating intermittently, popped into my local heating spares shop, and bought new one. 15 minutes to stick it on & reconfigure case etc, now working...

OK thanks, I guess a chartered mechanical and electrical engineer won't be able to understand. But thanks for the advice.....

Old vokera is going to be replaced in the spring, therefore trying to keep it alive until weather and cash permits. The problem; The hot water side failed completely, freezing cold all the time, so having researched the forum, looks like the diverter valve gubbins would be prime suspect. I've...