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  1. C

    Worcester 35 HE plus boiler/ tr2 thermostat controller replacement

    Ive moved into a house with a worcester greenstar 35 HE plus boiler in the garage. The TR2 thermostat controller is hanging loose on the wall in the living room, and is faulty. I want the TR2 replaced with a controller i can set a timer on, either digital or mechanical, the TR2 has three wires...
  2. M

    Greenstar CDI, Pressure loss, not HE

    I am a retired gas engineer. Corgi and Domestic Electrics + Building Surveyor. I have a Greenstar CDI 35kw that I fitted in my own home 15 years ago, serviced regularly, no issues till now. Suddenly its losing full pressure in approx 2 hours. I have concrete floors with buried copper pipe but...
  3. I

    Which Worcester Greenstar boiler to choose ?

    I presently have a Greenstar 24i junior installed, it's probably about 12 years old and getting cranky, the engineer suggested upgrading it to a 30 model sometime, but he just realised that the gas pipes would need changing (from 15mm to 22mm). My question is, which model would you suggest...
  4. B

    Worcester Bosch Greenstar 24i Pump Speed

    Can anyone tell me if the greenstar 24i circulating pump modulates? i have been looking at param 2.1c which references settings 0 to 4, i know the factory default setting is 4 (constant high pressure) which to me implies that it would not modulate on this setting, does it need to be setting 0 to...
  5. P

    Worcester boiler makes intermittent rumbling noises

    Our boiler makes these very loud rumbling noises every 2-3 minutes. We're quite used to them now but they have become a lot more regular over the past year or so (it only used to happen once every half an hour or so) and they can be quite annoying. Our boiler is a Worcester Greenstar 24I Junior...
    • PopeIsobelXVI
    • Thread
    • america boiler greenstar intermittent makes noises rumble usa worcester worcester boiler
    • Replies: 1
    • Forum: USA
  6. D

    Worcester greenstar heatslave ii central heating problem

    Hi I have an oil worcester bosch greenstar heatslave ii combi boiler. It's about 5 years old. The problem I have is when the thermostat calls for the central heating to come on. Most of the time the boiler light will come on, the boiler might fire up for a couple of seconds then the light will...
    • Dames83
    • Thread
    • america central central heating central heating system greenstar heating heatslave problem usa worcester
    • Replies: 2
    • Forum: USA
  7. T

    Greenstar 30i drips when filling.

    Hi all , went to a small top up on 30i yesterday at daughters house. Turned key , opened white valve gently , then water started to drip from right of filling key. Appeared to be coming from a small black knob to right of key. This seem a little loose so gave a gentle tighten. Any ideas what...
  8. M

    Greenstar 25si - TRVs

    Hi, I have a Worcester Bosch greenstar 25si boiler and wonder if I need to have at least one radiator always on? I read somewhere that I can have TRVs on all the radiators if the boiler has a “flowmeter”. In my case the always on radiator is in the bathroom. Can I have TRVs on all the radiators...
  9. S

    How to check water psi on a Worcester Bosch Greenstar 8000 Life 40c ?

    How do you check the water pressure on a Worcester Bosch Greenstar 8000 Life 40c? I've searched online but cannot find any help on our boiler
    • Shajin
    • Thread
    • bosch check greenstar help water worcester worcester bosch
    • Replies: 1
    • Forum: Central Heating Forum
  10. A

    Greenstar 4000 combi consistently high pressure

    I am a not an expert and worried about a boiler installation for my mum. She is 91 and lives on her own (vulnerable adult with dementia). I had a new boiler installed (Worcester Greenstar 4000 30kW Combi) end of August as she needs a reliable boiler. I visit my mum every 2/3 weeks (I live in...
  11. P

    Worcester Greenstar Boiler flu position conform?

    Hi everyone, I have searched on the forum and read many of existing thread however I am not still confident I found all info for my personal case, if someone could help. I am in the process of buying a house and the surveyor identified that the boiler flu might be too close to a opening...
  12. H

    Greenstar 28I Junior common/age related faults

    Hi. Looking for some advice. Recently had the flow adaptor fail on my Greenstar. Replaced it and all is good again but; judging by the reason it failed I am due for some more sh*tty plastic parts to let me down anytime soon. This thing and the internals of it were crumbling apart in your hand...
  13. B

    Worcester Greenstar Boiler- Low pressure

    Hi I am really struggling with my boiler. Keep losing pressure for the last week. I have to top up at least 3-4 times a day. No signs of a leak. Converted the garage 2 months ago, but this is happening now- not sure whether it could be a leak there or its the boiler. Isolated the boiler from...
  14. H

    Intermittent hot water on WB Greenstar 30 Si

    Hi, I have a WB Greenstar 30 Si and I am having a problem where the DHW intermittently cuts out then comes back on after a couple of mins. It happens on all taps/showers including the kitchen tap. When the problem occurs the flame light on the boiler goes on and the fault indicator light stays...
  15. U

    Greenstar 30 CDi every panel light flashing

    Hi, came home to this tonight. Boiler had been running fine, no problems at all. As no heat or hot water went to check boiler and it was lit up like a Christmas tree! No buttons functioning. Switched it off and on. Any idea? No fault codes given just every light flashing. Cheers.
  16. T

    Boiler swap. INTEC 40GS to Worcester Greenstar 32CDi Compact Combi

    Dear Forum members, Hope that you are all doing well! We are thinking of moving our existing boiler from its cupboard to a bathroom corner to free up some space A local specialist has recommended that we install a smaller boiler, so that it fits into the bathroom nicely My goal is to ensure...
    • TonyS
    • Thread
    • alpha america boiler combi compact greenstar replacement usa worcester
    • Replies: 28
    • Forum: USA
  17. G

    Worcester combi 25Si burner light out

    Hi all. was wondering if anyone knew why my hot water is not working on Worcester Greenstar 25Si . sequence of events: I removed a radiator for decorating , shutting of valves etc then repressurised the boiler back up to 1.5. All seemed to be working . I turned off water overnight. Next day I...
    • Graydraws
    • Thread
    • 25si america burner combi greenstar light usa worcester worcester boiler
    • Replies: 7
    • Forum: USA
  18. S

    Question re: condensate pump on Greenstar 440

    Hi, The condensate pump on my Worcester Greenstar Highflow 440 CDI is flashing green and red simultaneously, halting after a few goes at starting up from power on. Is there anywhere I should be looking for obvious issues ahead of the plumber coming out in a few days? Thanks, Lou
    • scs4ldb
    • Thread
    • america condensate greenstar pump question usa
    • Replies: 3
    • Forum: USA
  19. T

    W/B Greenstar Heatslave 25/32 (installed 2009)

    Hi, any advise would be welcomed. My boiler has locked out, due, I believe to water overheating. Although the water in the boiler seems to be piping hot, the only water coming from the hot tap is cold. If I let the water cool down over time, the boiler resets ok, but when the water gets hot...
  20. D

    URGENT worcester bosch greenstar 28i combi not hot water but radiators are fine

    having a few issues with my boiler. worcester bosch greenstar 28i. has been serviced every year. last serviced in jan. i moved into this property in feb. been experiencing these issues since feb but in the past month has gotten much worse. so radiators work fine they all heat up. the combi...
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