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  1. C

    Worcester Bosch Heatslave 26/32 (Oil boiler 2007) Flue perished

    Oily smell from boiler recently before failed. Great plumber sorted though when opened external baffle at front of sealed flue the internal spring like tube lining outer insulation had all perished. Barn conversion with thick walls (763mm). Worcester Bosch say Flue Kits are obsolete and...
  2. H

    Worcester Bosch Oil Heatslave Switch On Problem

    Help Please We have a 2005 Worcester Bosch Oil Heatslave 26/32 that is fitted with the optional timer. Recently we have a problem. To get either the heating or hot water to switch on the timer has first to be set for both to be ON but this just prepares the unit as neither will switch on at...
  3. M

    Water leak Worcester Bosch Heatslave 25/32 External

    Noticed today that the ground looked damp around the outside of our Worcester Bosch Heatslave 25/32 External Boiler. Took the cover off and warm water is pooling in the base of the unit. Can't see an obvious leak and all the components are dry. I'm guessing it's the thermal store leaking. Is...
  4. Z

    Any Worcester Heatslave Experts?

    Hi Folks I'm wondering anyone here, has any indepth knowledge on the Worcester Heatslave Combi Boiler. This boiler is quite old (2006) but it has been very reliable, and also runs at superb efficiency when tested, regularly serviced etc. The boiler is in a very old stone cottage (built 1791)...
  5. TimC74

    Heatslave 20/25 issue

    Hi guys and girls, the fan on my Heatslave 20/25 doesn't start, I've had look and cleaned fuel filters etc and everything that should be clean is clean, fan blades have been cleaned and it moves freely by hand. When I try the boiler I can only hear the ignition clicks. I'm thinking I will need...
  6. J

    Heatslave 20/25 lockout not control unit or burner

    Hello!! I’ve got an old heatslave 20/25 running on kerosene. Came up with a lockout today. Tested everything I could. Symptoms, blower not starting. But… The burner runs and the boiler works if I bypass the “back to mainboard” loop for the blower motor live. To be specific, pin 4 pink wire from...
  7. S

    Worcester Oil Heatslave 20/25 Thumping / Knocking Noise

    Hi, I wonder if anyone can help. I have a Worcester Oil Heatlslave 20/25 that has started making a fairly loud knocking noise and the the pressure gauge flicks a little when the noise thumps. The hot water still works, I've turned off the heating for the time being. Any ideas on what the...
  8. D

    Heatslave greenstar II 18/25 duel oil feed

    Hi all, Thanks for reading. I just picked up a 2015 greenstar 2 heatslave 18/25 oil boiler to replace my relic from the 80's (still a greenstar bit not up to the flow requirements and it's not a condensing boiler so not efficient). Obviously a used item, it has 2 oil feeds. My current boiler...
  9. D

    How to fill loop on greenstar heatslave ll external

    Hi, I’m trying to locate the filling loop on my combi boiler. There isn’t much info in the manual, just your installer will inform you where to find the filling loop which they didn’t. Any advice would be appreciated, I’ve attached some photos.
  10. S

    Heatslave 18/25 not firing

    Heatslave 18/25 not firing. No heating or hot water but no lockout light and diverter switch is locked in place. Hot water was scalding hot earlier despite being set at a middling temp on the boiler and now there’s no CH or hot water. Makes a whirring noise but nothing fires up when we call for...
  11. K

    Heatslave common parts

    Hi all, can anyone confirm to me what the difference is between a heatslave 15/19 and 20/25 physically? So the reason for the question is if I bought a second hand 20/25, could I strip it down and use most of the parts as spares on my 15/19. From what I can gather, heat exchanger plate, pump...
  12. D

    Worcester Heatslave Diverter Valve Problems

    Worcester Heatslave 12/14 Had a plumber out for a suspected diverter valve problem. He changed the top part and left. Next day he said the brass part might me a bit sticky, so he changed that. Now I have heating and hot water. Unfortunately the hot water comes out scalding for a short while...
  13. Fluke67

    Baffled by intermittent running CH pump on Heatslave 15/19

    Hi hoping someone can help with this as its beginning to drive me nuts. Boiler generally well serviced and working fine, no problems with DHW. Central heating recently began to occasionally fire up as normal and run until it reached temperature set by flow control thermostat at which point...
  14. B

    URGENT Leaking PHE inlet block on Heatslave II 25/32

    Heatslave II 25/32 water leak from PHE Inlet block. When DHW PRV fitting was removed a white flat seal/washer was found in 3 pieces. This seal is not listed on any diagram. It sits ahead of the rubber o ring item 45 on drawing and has has the same ID and OD as the oring but is made from white...
  15. M

    URGENT Heatslave 12/14 No Hot Water (for a week now). :-(

    Hi all. I have a 20 year old Worcester Bosch Heatslave 12/14 Oil-fired I'm getting about 20 seconds of hot water, then the boiler won't fire. I can crank the HW dial right up and it'll fire and give me another 20 secs of hot water. It won't fire again with demand from the tap. It was losing...
  16. C

    Worcestershire heatslave 15/19

    Hi new to this forum, hope someone will have the answer to my issue. I have Recently had a new Diverter valve brass body and motor replaced on my 15/19 Worcestershire heatslave oil boiler, due to the old one seized. Since this i have had issues with the water pressure in the boiler it drops to...
  17. R

    Worcester Heatslave humming

    Heatslave 20/25 subtle humming from boiler new motor fitted fully serviced recently, it's the sort of sound you would get from a HV transformer that sort of hum deep and annoying, nothing to do with circulation pump it's still there with the circulation pump off. I guess it only leaves the oil...
  18. 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...
  19. S

    Heatslave 18/25 (Oil fired)

    CH pump and diverter valve active when there is is no demand. I suspect relay 4 is sticking but don't know how to prove it. If I switch the heating on and off from the programmer it eventually stops.
  20. B

    Hot water but no heat Heatslave 18/25

    We have a 9 yr old Heatslave 18/25 that's been regularly serviced. Heating was on in the morning but failed in the evening. My son is Gas safe engineer and suggested trying a few things before calling our usual engineer. He disconnected the twin channel control panel and put in link's so it is...
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