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    Fault on Danfoss mid-position valve

    I have replaced the actuator as you suggested CBW. And I've replaced the valve itself for good measure. Both were at least 8 years old, so I suppose they haven't done too badly! The system now seems to work perfectly. So I don't think there was any kind of cylinder stat wiring issue. I am...
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    Fault on Danfoss mid-position valve

    When the fault occurs I can overcome it by tapping the actuator sharply with my finger tips. So I don't think the fault is caused by anything outside the valve and actuator. I think it's a mechanical issue. The valve is more difficult to turn now than when it was new. And I imagine the...
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    Fault on Danfoss mid-position valve

    I have an interesting fault on my Danfoss mid-position 3 port valve. If the valve starts unactivated (DHW position) and there's a call for CH only, then it works every time. So the actuator moves through its full extent and both internal switches work faultlessly. But if the valve starts from...
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    Faulty modulation on Greenstar 18ri boiler

    I agree that the engineer might not agree with me, Gas2Air. But I have lived with this boiler for a long time and the symptoms tell me that a fault with the modulation is very likely. So the engineer might well agree with me. Then we come to the real problem. Can an engineer be certain which...
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    Faulty modulation on Greenstar 18ri boiler

    Okay Are you saying that if a competent gas reg engineer agreed with me that there is something wrong with the modulation then they would be able to test my boiler and know for sure which component is faulty - the control board or the gas valve? Mike
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    Faulty modulation on Greenstar 18ri boiler

    Hi I think the modulation on my Greenstar 18ri boiler is faulty. On very cold mornings the boiler naturally reaches a higher than usual temperature during the initial warm up period. Then the boiler shuts off even when there is still demand (no fault is shown). I can make the boiler start...
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    Backflow from cylinder to central heating boiler

    The flow I would like to stop is a reverse flow. The water is pumped into the coiled pipe in the cylinder from the top. So when the pump stops the water tends to flow backwards up to the boiler. So maybe a normal non return valve would be better than a featherweight one. But how much...
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    Backflow from cylinder to central heating boiler

    Thanks for your suggestion about a featherweight check valve. I'll see what I can find.
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    Backflow from cylinder to central heating boiler

    It has been like this from the start. The possibility of back-flow never occurred to me when I decided my layout. It is a fairly minor problem. The energy loss is probably less than one kilowatt hour per day for 100 days each year. So not hugely expensive. It would just be nice to solve it.
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    Backflow from cylinder to central heating boiler

    My central heating boiler is close to my hot water cylinder and above it. Consequently there is a gravitational flow from the coiled pipe inside the cylinder back up to the boiler. This occurs when the pump turns off. The result is that the water in the lower part of my cylinder cools down...
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    Kitchen install advice

    Our kitchen is also unsquare. It is more subtle than yours but it does mean that some worktops cannot be completely square. Our floor is also nothing like level - but that is another matter! I accepted the unsquareness rather than trying to hide it. Then I decided which worktops I preferred...
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    Repair a small section of silicone seal

    I thought there must be no old sealant at all underneath the new. Hence all the stuff about sealant removers. But my question is about cutting out a small length of the old seal and inserting a small section of new sealant.
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    Repair a small section of silicone seal

    I sealed between some solid wood worktops and the wall with silicone sealant. Unfortunately some water has penetrated the wood in one place and gone underneath the silicone seal. I think I need to remove the seal at this place. Then I can sand and oil the wood better, and apply some more...
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    Roof vent for extractor fan - how far from my soil stack?

    I am installing an in-line extractor fan in my bathroom and it would be convenient to vent it through the roof. How far does the roof vent need to be from the top of my soil stack?
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    Floor varnish peeling off

    Thanks for your further advice Ian. It is good to know that most people are using water-based floor varnishes and recoating when necessary without any problems! Mike
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    Floor varnish peeling off

    Thanks for your ideas woodfinishes 1877. We cleaned the floors thoroughly but didn't sand them - no trouble with doing this with solvent-based varnishes in the past! We are thinking of sanding back to the wood as you suggest. If we do, should we use a water-based varnish, even though we...
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    Floor varnish peeling off

    We varnished our kitchen and bathroom floors twenty years ago and recoated them with solvent-based varnish every five years or so since. We never had any problems until now! Last year we couldn't find any solvent-based floor varnish, so we recoated with a water-based one instead. Now we...
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    Does my central heating cycle on and off too quickly?

    Thanks for your ideas so far. I wasn't trying to 'keep my cards close to my chest'! The room stat is set at 20c. The boiler is a greenstar RI and its temperature is difficult to tell because there are no calibrations. My pipe thermometer says it goes up to about 70c. It is definitely...
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    Does my central heating cycle on and off too quickly?

    It's about 9 minutes between on and on. My boiler turns on for about 4 minutes followed by off for about 5 minutes. I have a Danfoss room stat in the hall and this is what is controlling these time periods. What I really want to know is are they normal? Do other people's systems turn on...
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    Does my central heating cycle on and off too quickly?

    After my central heating settles down it cycles on and off and on again every 9 minutes or so. Is this normal or is it much too frequent? Will it shorten the life of my boiler?
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