central heating

  1. I

    Potterton Powermax HE 85 CP not switching on

    I have a Potterton Powermax HE 85 boiler, which is about 15 years old. This morning I noticed the boiler was off so I checked the house electrics to make sure there was no trip switch activated - there wasn't. I am insured with Baxi who are visiting next Thursday to repair and do a service...
  2. VortexGrant

    Grant Vortex Condensing Combi Internal 26 - won't fire CH unless Store Thermistor disconnected

    Hi All, Just hoping someone might have an idea on this. The boiler is running fine in terms of hot water but stopped running the Central Heating when called for from the Hive (It's sending a Live feed to the boiler from the Hive so thats all good.) We thought it might have been a PCB problem so...
  3. E

    Noisy Radiator Clicking

    Have recently moved into a new house and the radiator in our master bedroom clicks like hell when heating up and cooling down. Searched on here and tried everything below but nothings worked. I’ve traced the sound as best as I can, and whilst I can hear/feel it mostly from the TRV pipe side it’s...
  4. D

    Replacing a leaky Speedfit-type connector - OK to do this?

    I have a twist & lock 22mm Speedfit-type connector (though I think it's a generic brand) on the central heating system and it has sprung a small leak so wish to replace it with similar. I would grateful for comments on my plans to carry out the replacement. The gas central heating system is...
  5. C

    Auto bypass valve | Advice on how to fit with a 160cm wide radiator

    The furthest radiator from my boiler is a 160cm x 50cm Type 22 in my living room. It has always been set as the bypass, but this isn't ideal. The living room can overheat, whilst the kitchen is cold. The obvious answer would be to set a lower temperature on the TRV in the living room, but this...
  6. M

    Help understanding why I'm not getting enough Hot Water for a full bath

    Hi all, I moved into a new house earlier this year, so this is the first winter. The house is approx 25 years old and has the original (system) boiler with HW cylinder (serviced each year). When we first moved in we had plenty of HW. However, since winter has come along and we have had the...
  7. F

    Is my expansion vessel faulty?

    Hi All, Need help please. I noticed the radiators upstairs were not getting hot and the top of the towel rail in the bathroom was cold. I bled the air out of all the radiators checking downstairs too and refilling water using the filling loop as i went. I got to having 1 bar system pressure...
  8. W

    TRV valve Help

    Hi I live in a rental and only two of my radiators have TRV heads. There are valves with no heads I am hoping someone will recognise what they are and I can just buy a head and not a whole new valve If anyone can help that would be amazing
  9. G

    Recommendation on cylinders

    Hello! I have a new Vaillant boiler being installed and will install a new cylinder at the same time. Our installer is recommending a UK Cylinders ProLite Air twin coil solar indirect unvented cylinder 300ltr. According to specs the standing heat loss is 1.80 kWh/24h which seems pretty decent...
  10. M

    System boiler - should HW automatically come on when CH is turned on?

    Hi all, I moved in to a new house earlier this summer which I believe has a system boiler (I'm used to a regular boiler in my old house). The HW is programmed to come on twice a day. This week (as I am sure a lot of people have :)) , the CH went on for the first time. I noticed that when the...
  11. SomethingSomething

    New CH system - hiding pipes?

    Hi All, Thank you for your time! FTB's - We're moving into a new property in 2-3 months time which currently has an old-style gas multipoint water heater and electric storage heaters, but no central heating. The property is a 1950-1960s end-of-terrace three bedroom, would there be any...
  12. W

    Nest

    Hi About 2 months ago we had a neat fitted and UFH with its own thermostat. The CH did work when it was first installed but with it being summer it was left unused. Now the Nest does not appear to be firing up the boiler. The green dot is on the heat link which means they're connected. The UFH...
  13. D

    Why aren't central heating biocides widely available?

    Last autumn, I cleaned out the central heating system (old back boiler with F&E) with X400, and dosed with X100. It hadn't been touched for a good few years prior to that. A few months later, I find this gunge in the tank (stringy/white stuff) which Google tells me is probably bacterial and...
  14. P

    Preparation of concrete subfloor for wet UFH

    Hi All, I am doing a kitchen extension. 3m X 6m, and like to install wet ufh. need help to decide the best way to prepare my concrete subfloor for wet ufh. option 1: mot + sand blinding + dpm + kingspan + dpm+ concrete + ufh boards (18mm) + ufh pipes + screed + tiles option 2: mot + sand...
  15. T

    Draining down coz non-working CH rad. Re-use the same water?

    Hi Householder here. Non-expert. Central heating circulation. One of my (total three) radiators doesn't get hot. It is full of water (no air). There is a regular lockshield value at one end and a TRV at the other. They are both open. I have checked the spindle in the TRV (FAQ6). The...
  16. L

    System boiler has lost pressure after temporarily taking down radiator

    Hello, We recently took down a radiator temporarily for paintwork. (We have an Ideal Logic System boiler with hot and cold water tanks in the flat, if useful to know). We re-fixed the radiator this morning but now have no hot water or central heating. We have an F1 error message - all water...
  17. R

    Identifying parts

    I have just dismantled my old oil boiler (22 yrs old) and electrics that go along with it. A new one will be installed later in the year, and moved to a different location due to building works. In doing so, there are a couple of components in the electrics that I have no idea what they are...
  18. 0

    Help with Honeywell DT2 Thermostat install

    I'm replacing my thermostat with a digital one as the old one always overheats the house. The old one has three wires: The new Honeywell has a few options for wiring in the manual: I connected live (brown) to A and 3 (grey) to B, leaving the other two wires unconnected. When doing this...
  19. OwainOW

    Another st699 to hive thread

    Hi all, Sorry to add another thread but I’m looking for some help. I have installed a hive v3 water and heating replacing my old st699. This was prompted by removing the old thermostat that I thought wasnt working and doing nothing to find it was infact setting the heat of the house and plunged...
  20. S

    Help needed with pipework for oil-fired central heating!

    Hi there, we're hoping to install oil-fired central heating in our house but just needing a bit of help/advice with the pipework. We want to open the floors and get the worst of the runs in ourselves as our budget is limited with a baby on the way!! We have the boiler, oil tank and radiators...
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