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  1. M

    Worcester Bosch 24i tepid water

    Hi We have a worcester bosch 24i 10 years old, the CH works fine everything looks ok with the boiler, the hot water though is tepid, this has just happened today. The diverter valve is operating correctly when you turn on the hot water tap on , so it is a mystery. Any ideas? Chris
  2. Peter J Brown

    Old Worcester Bosch 28i junior

    hi guys got phone call yesterday to go and look at a boiler fault, on arriving was informed that another company had been there three times in the last month. Was told that the first visit they checked all the electrical connections ie fan, air pressure switch and gas valve , the fellow said the...
  3. M

    Worcester Bosch Controls

    I have a Greenstar Comfort 11 RF controller and I am trying to set the holiday function.The problem is, at the end of the setup procedure do I leave the controller in the OFF position or the Auto position? I ask this because if it's the OFF position one can't set it until your about to leave...
  4. david stanton

    worcs bosch 24i to 34/38i ?

    i've got a worc 24i at 9l which is about 5 years old, from reading specs the only difference on the 34/38i is the litres flow rate, i'm presuming this is just one part in there that makes the difference? Can a 24 be "converted" to a 34/38 with some swap of a part, so I can get a much better...
  5. P

    Worcester Bosch Greenstar 30 CDi Conventional Boiler

    Hi All, I have the above mentioned boiler linked to a Nest Thermostat. The problem I have is when the boiler is set to No.5 which heats the water to circa 67 degrees, it reaches temperature, the gas light goes out and it cools down to circa 30 degrees then heats back up again. This continues...
    • Philip Bartleet
    • Thread
    • boiler bosch greenstar worcester worcester bosch
    • Replies: 7
    • Forum: Boilers
  6. B

    Short cycling Bosch Worcester 30CDi Greenstar - Bypass Valve?

    My first post, so apologies for any incorrect terminology I had a Bosch Worcester 30CDi Greenstar Classic Regular Boiler installed in 2014. The Boiler is used in a vented S-plan system, with two motorised valves, a manual Bypass Valve, a British Gas (Grundfos) Multi-head pump, Hot Water...
  7. N

    BOSCH RD 532i Pressure & Temp faults

    Hi all, I have a Bosch rd532i and recently it's started to develop various faults. It keeps overpressurising when not in use overnight, leave it on 1.2 bar and 12-14 hours later it's on 3-4bar. I have removed the pressure each time immediately though the relief valve. Secondly, when the...
  8. D

    Worcester Bosch 28i series 2 not heating radiators

    Hi, I have a microbore heating system with the above boiler, now 18 years old. recently, I had 3 radiators replaced and all worked fine for about 3 weeks. Now however most of radiators are only getting warm, some hardly at all. The pump is running and the whole system has been bled and topped up...
  9. Mikesaint

    Worcester Bosch Greenstar 12 Ri yellow cap

    Hi, anyone able to assist naming and tracking down a part for this boiler. It's between the 'mains cable inlet' and the condenser drain. It has a yellow plastic screw on cap which has split and is leaking. Seems a simple part to replace but I can name or find it on any parts site Thanks
  10. T

    Worcester Bosch Greenstar 24Ri LPG Leaking From Inside

    Hi I'm worrying about my wall-hung boiler which has leaked a couple of times from somewhere underneath the green on light. I believe this is to do with the syphon trap leaking condensate, can you suggest what it might be? Just my luck over Christmas !
  11. D

    Worcester Bosch Greenstar 30si LPG Thermostat

    Hi I have a 6 year old Worcester Bosch Greenstar 30si LPG Combi Boiler, currently I have a Honeywell T40 thermostat with the Brown Wire going to connector no 3 and Blue Wire going to connector no 1. I have bought a Honeywell Lyric T6 Smart Thermostat. There are 2 parts, first the Reciever Box...
  12. B

    Which Worcester Bosch Boiler For Our Home? Please Help!

    Hi All, We may need to replace our boiler - the OLDER version Worcester Bosch 35Cdi (see images attached) Our home is a 1920's Semi 5 Bedrooms 2 Bathrooms 5 x Large (1800mm) Double Panel Radiators 1 x Large (1800mm) Single Panel Radiator 3 x Medium (1400mm) Double Panel Radiators 2 x Short...
    • Bazzy
    • Thread
    • boiler bosch worcester worcester bosch
    • Replies: 39
    • Forum: Boilers
  13. D

    Bosch Smart Radiator Thermostats

    im thinking of having a Bosch combi boiler installed with a Bosch ct200 EasyControl smart thermostat, do you have to buy a Bosch Smart Home controller as well to work Bosch smart home radiator thermostat’s on the same system ?
  14. R

    Worcester Bosch 30i for a 4 bed house?

    Hi all, I'm currently in the process of replacing my ageing potterton conventional boiler with a combi. We've had a couple of quotes but there's one company in particular who we're thinking of hiring to do the job. We have a 4 bedroom house with a single bathroom and 11 radiators. This...
  15. D

    Slow flow DHW from Worcester Bosch Greenstar 28i Junior Boiler

    Hi, I've got a 7 year old Worcester Bosch Greenstar 28i combi boiler, the dhw flow rate has gradually got slower over time and is now only about 4 litres a minute, the water is consistently hot all the time just slow flowing, all the hot water taps in the house run at the same pace, cold flow is...
    • Danman
    • Thread
    • boiler bosch flow greenstar junior worcester worcester bosch
    • Replies: 1
    • Forum: Boilers
  16. Michael Groves

    Worcester Bosch Greenstar Ri boiler short circuit

    I’m an electrician. I’ve been called to customer home to trace a short circuit. When I disconnect the boiler and put my meter across live and neutral I get 118 ohms. I called Worchesterbosch tech support and the guy said yes that’s normal, no hold on I’ll ask my mate. Then apparently said no...
    • Michael Groves
    • Thread
    • boiler bosch greenstar worcester worcester bosch
    • Replies: 17
    • Forum: Boilers
  17. L

    Worcester Bosch Greenstar - No CH

    Hi Guys, Wondering if you could offer some advice, we have just bought our first house and we are having a nightmare with the CH. I will be having the full system replaced in the next 12 months (when we have the £'s), but for now, I am hoping to keep the old system going. We have a Worcester...
  18. R

    Worcester Bosch Heatslave 20/25 oil hose size

    Worcester Bosch Heatslave 20/25 oil hose need to pick one up from my local plumb merchants and hes asking what size connectors male female etc does anyone know the spec i require thanks
    • richard3009
    • Thread
    • bosch size worcester worcester bosch
    • Replies: 2
    • Forum: Boilers
  19. M

    Worcester Bosch Guarantee

    Had a WB Greenstar 30 Si fitted end of July with installers invoice stating a 10 year guarantee. Have received an email from WB acknowledging registration of the products guarantee but absolutely no details of time span or terms and conditions. Can't seem to get any sense from their...
  20. M

    Long term noise levels Worcester Bosch 28CDi vs 30i

    Hi Choosing a new replacement Worcester Bosch combi boiler - both are about the same price. Anyone have experience of what the noise levels are like - the WB website says 52 decibels for the small one and 50 decibels for the larger - but what are they like in real life over the longer term...
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