trapped air

  1. G

    Boiler problems in big house - Change required?

    Let me first list the set-up we have: Vaillant ecoTec Plus 637 system boiler Zilmet unvented hot water cylinder with external expansion vessel 1 zone valve for Central Heating 1 zone valve for hot water cylinder 1 Grundfos 15-50/60 circulation pump (on flow pipe from boiler) 16 radiators...
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    • Thread
    • bigger pump boiler wiring circulation problems grundfos powerflush relay box relay wiring thermostat trapped air vaillant
    • Replies: 30
    • Forum: Plumbing and Central Heating
  2. G

    Water pressure drop to loft with unvented cylinder

    Hi all. We are having trouble with water pressure from our unvented hot water cylinder tank (a.k.a megaflo/megaflow). Over time, the pressure has reduced so much that we can't get any decent flow rate from the taps in the loft. Ground floor and first floor are very powerful as you can see on the...
  3. L

    Airlock in CH system, but all radiators are working?!

    Hi there. Three weeks ago we had a new pump fitted in our (conventional) boiler. Now the central heating sounds like it's possessed. Whenever it comes on there's a period of about ten minutes where it sounds like the pipes are going to pull apart; clanking, clanging, whooshing, HUGE crashes and...
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