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  1. 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...
  2. 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
  3. 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 !
  4. 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...
  5. R

    Loss of water and pressure in my greenstar pressurised system

    The green light in my greenstar to pressurised system has gone out after I lost water and pressure changing a radiator and valves. I re-filled the system and pressurised it back to 1.1 bar but the green light won't come on. It briefly came on when the hot water started but went out again.
  6. G

    Filling loop on Greenstar Heatslave ii 18/25

    Hi I’m trying to put more pressure into my external oil combo boiler (heatslave ii 1825) but can’t ring the filling loop The only thing I can see which looks like a braided pipe with 2 black valves is right at the back of the boiler so is pretty much unreachable. So I’m assuming that can’t be...
  7. W

    WB Greenstar 37cdi combi

    Just out of interest, has anyone delved into 'scoping the pwm signal from the board to the ddpwm grundfos pump on this series of boiler (3 thin wires-white/black/purple from board to pump electronics)? WB techline say they had no info on what the pwm waveforms should look like for the different...
  8. E

    Noisy condensate on Worcester Greenstar 25i

    Boiler installed 7 weeks ago. Every 2 or 3 days I hear the condensate water running down the pipe loudly and then a glooping noise from inside boiler for approx 30 seconds. Boiler operates well. No error messages or flashing blue light. Any ideas what could be the cause? There are no blockages...
  9. A

    Worcester Greenstar 24i Junior - Vibration

    This boiler is giving me headache literally :eek: the best way to explain it is when the CH is first switched and the boiler is giving its all its spot on, running almost silent! Give it about 30 minutes or so when all the rads are up to temperature it then starts to slow down and gives out...
  10. G

    Greenstar 34DCI Classic intermittent fault

    Hi Folks, I have a puzzling issue that I hope someone could help diagnose. The mother-in-law has a Greenstar 34DCI Classic that has worked fine for ~7 years (without a service ). Recently it has been intermittently cutting out and requiring a reset and displaying an "EA" error message on the...
  11. M

    Wiring from 3rd Gen nest heat link to greenstar heatslave

    Hi, I have a worcester greenstar heatslave ii 25/32 external oil combi boiler and i am wanting to connect a nest 3rd generation and be able to control the hot water and also the central heating on the Y plan. It all looks very simple but on youtube Videos, it shows something different mainly...
  12. D

    Burnt out Solenoid on gas Valve Greenstar 30 i Erp

    Green star 30 i Boiler has Burnt out Solenoid on gas Valve. Worrying thing is the boiler didn't turn off and the plastic coating the solenoid kept smouldering. Has anyone had/seen this before. I am a Physicist, is coating a solenoid with plastic normal? This is/was obviously a fire hazard...
  13. U

    Greenstar 30CDi Leak

    Hi Hoping somebody could give me a heads up regarding this problem I've discovered on my Greenstar boiler. Hoping its just a seal or washer replacement and possibly something I could do myself. It's a slow leak starting at the top in and around the yellow locking clip and running down back of...
  14. G

    Greenstar heatslave external 26/32 not starting

    Hi, Recently moved a radiator so drained the system to do this. I turned the power off on the boiler. 4 hrs later refilled the system and re-pressureised the boiler. Turned the power back on, circulating pump starts and then a minute or so later the burner fan starts. Fan keeps running for...
  15. Harvest Fields

    Worcester Greenstar 37 CDi Combi

    Just walked into this, first time I have been here. 4 bed semi, 1 bathroom, 1 ensuite, 1 WC. I do not want to touch the thing. Ohh and the cover plate for the heat ex is t secured and moves all over the place. Tried to upload a video but it will not let me do pics will have to do.
  16. P

    Greenstar 28i Junior hot water question please.

    Could anyone please confirm, if this boiler has a preset for the hot water temp? This boiler has an owner adjuster for the CH but not for HW ( understand later models such as the 30i, had both ) If there is a preset adjuster, can anyone please tell me where to find it. Thank you, Pete.
  17. hammers4spanner

    Worcester greenstar intermittent fault

    Attended this on friday heating and hotwater cut out after about two minutes , slow flash on blue light mainly on. Reset boiler and same same, replaced flue stat and temp stat but still same fault .
  18. 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
  19. 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
  20. 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...
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