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  1. P

    Intermittent Hot water issue with Worcester Bosch Greenstar 35 CDI

    I have a 16 year-old Worcester Bosch Greenstar 35 CDi combi boiler, which is recently suffering from intermittent issues with the hot water. I usually get the shout from a family member who’s in the shower and found there’s no hot water. If I’m near the boiler when this happens, I can see the...
  2. S

    Can I stop my boiler from coming on randomly several times a day?

    Hi, I have some knowledge of plumbing and heating and have installed several in my time. I have a new Worcester Bosch Greenstar 40CDi Classic Regular Gas Boiler (Gravity Fed System) new boiler and it was installed by a British Gas engineer recently, as I wanted a Gas Safe certificate with this...
  3. A

    Worcester Bosch Greenstar 30 CDi - Pressure loss

    Hi all, Recently moved into a new house and noticed the Greenstar boiler has low pressure on the dial. Quick Google suggests using a key, valves, or fill loop to increase the pressure. Only problem being is I don't have either of those things. Any help would be appreciated. Cheers.
  4. S

    No hot water. Combi Greenstar i

    Good afternoon. Our Greenstar i combi boiler works fine for heating but I am trying to find out why the boiler doesn't fire when I call for hot water. The fan seems to go but no blue light or firing up. Checked the pressure, all OK. The radiator underneath the boiler had a lot of air yesterday...
  5. J

    Worcester GreenStar 15Ri - fails with blue flashing light

    Condensing boiler installed by local Gas Safe plumber in 2014, not combi. Failed a couple of weeks ago with flashing blue light which googling suggests means no gas, blocked flue or blocked condensate pipe. There is gas, the flue is clear, and the condensate pipe goes into the under-sink waste...
  6. L

    Greenstar Ri No filling loop

    Hi Everyone, hopeing someone can help We have a Greenstar Ri Boiler and its lost pressure, pressure gauge on top of the boiler reads 0.6 bar and i know this should be around 1.5bar, there is no external filling loop near the boiler or in the hotpress, there is a pipe in the hotpress with a red...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...
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