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    What has gone wrong with my unvented system?

    And yet the only common denominator is YOU, Darren.
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    What has gone wrong with my unvented system?

    Sorry you don't like the COMPLETELY FREE advice from a qualified person on their day off. I won't be troubling you again, that's for sure! :rolleyes:
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    What has gone wrong with my unvented system?

    You had the answer on the first page. All the rest has been useless drivel. The expansion vessel will be completely flat, I'd bet money on it. The pressure gauge you're reading is on the inlet as far as I can tell so the rising pressure won't be seen as it's after a non-return valve. TPRV or PRV...
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    What has gone wrong with my unvented system?

    So if that's the case tell me why the overheat thermostat (usually) cuts power to the zone valve and closes it? If you're G3 qualified you'll know this ;) .
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    What has gone wrong with my unvented system?

    Manually opening the zone valve is effectively bypassing a safety device and potentially dangerous. This is why unqualified people shouldn't be giving out advice to unsuspecting people.
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    Vaillant ecoTec plus 637 Nest controls and pump overrun

    These do have a built in bypass but if it's noisy you might need an external one to reduce the noise. Need's to be tee'd in on the main flow and return but before any zone valves
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    What has gone wrong with my unvented system?

    That's the pressure in the boiler and heating system, not the cylinder. Totally separate.
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    Replacement for British Gas Multi Head G Central Heating Pump?

    Literally any Grundfos 15-60. Alpha2 if you have the space. UPS2 if not.
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    Boiler 'capped' due to gap in flue. Repairable?

    Some new boiler flues can be fitted from inside by using a slightly bigger hole. The rubber seal is folded in then expands when it gets outside before pulling it back to the wall. You can then have the inside properly sealed to make it rigid.
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    Modifying a 22mm vent pipe

    Or just do it up tight and trust that you're not incapable of doing a simple compression coupler ;)
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    Modifying a 22mm vent pipe

    You should be able to get the lid off with some manipulation. Never found one yet that I couldn't... Keep it well above the water level. As long as it's properly through the lid you shouldn't have any problems with splashing as it should only be discharging water in a fault situation anyway.
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    Vaillant ectotec Cycling Problem

    I see oversized boilers on a daily basis. Perfect example today was a Vaillant 637 (37kw) when a 624 would have done it perfectly well (12 rads). The difference is that the 4 series fires on high rate where the 6 series starts on low. If you oversize a 4 series it will cause more issues than the...
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    Vaillant ectotec Cycling Problem

    Also it DOES work.
  14. S

    Vaillant ectotec Cycling Problem

    They improved it in the later models. They learned from their mistakes.
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    Vaillant ectotec Cycling Problem

    It's not a fault that's why. Just the way the boiler works. Appropriately sizing the output of the boiler is the best you can do.
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    New water mains pipe or accumulator in Potters Bar, Herts Update 11/9

    Static pressure of 2bar will give poor performance from an accumulator. Not to say it won't work at all but they rely on a high static pressure.
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    W/C Extractor - Building Control

    It definitely needs some ventilation, it's very humid in there even though it's had minimal use so far! I like the idea of it running constantly. Is it just the heat recovery type that do that?
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    W/C Extractor - Building Control

    Just to confirm, do you mean a fan that runs constantly very slowly but with a boost?
  19. S

    W/C Extractor - Building Control

    Had a feeling I'd need one but wanted to see if there was a way around it! Does it have to come on with the light or can it be independent?
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