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  1. M

    Boiler adding air into system when hot?

    Yeah, probably will do. Just thought I'd see if it was something I could have sorted by myself after the bloke who said he'd come round last week didn't turn up or ring up!
  2. M

    Boiler adding air into system when hot?

    The last service was at the end of 2019, so it's due another - maybe I should ring up the business who did the services and ask if they generally clean out magnacleans when they do it? I imagine the sludge has been coming from one or two of the upstairs radiators which seem to build up quite a...
  3. M

    Boiler adding air into system when hot?

    I've cleaned out the magnaclean, not sure how clean I'm supposed to get it but took the sleeve off and scraped off all the crud and gave the rest a good rinse and a wipe down with plenty of tissue. I've attached some photos of the filter and the stuff I scraped off. There's just a thin...
  4. M

    Boiler adding air into system when hot?

    The boiler was fitted in 2014 by the previous owners (to replace the original 2004 one) - the invoice they left says it was flushed with magnacleanse and inhibitor was added before fitting. It's been annually serviced every year since but I'm not sure if any more inhibitor has been added since...
  5. M

    Boiler adding air into system when hot?

    I previously made a post here about low heat output of the boiler - this has been mostly rectified with a balance however two radiators still only get hot at the top and not at the bottom. Edit: Forgot to mention the boiler is a 26kW Viessmann Vitodens 100-W WB1B :) When the heating/hot...
  6. M

    Viessmann 100 short cycling while warming up, overall low heating?

    Hello, Recently I moved into a property built in 2004, which had a boiler replacement in 2014 with a Viesmann Vitodens 100 WB1B, 26kW. I believe the system is open-vent as there is no pressure gauge, tanks in the loft, a HW cylinder, and what looks to be only a feed and return pipe out of the...
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