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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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.
  7. 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...
  8. S

    heatslave 12/14

    hi i have a heatslave 12/14 boiler which the other day produced a small amount of black smoke on start up but worked fine today the boiler is running all of the time i have noticed that if i put my hand in front of the flue its as good as cold, luke warm and if i turn the water right down on the...
  9. 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...
  10. R

    Worcester Bosch Greenstar Heatslave Boiler Smell.

    Hello, this is my first time on the forum. Three months ago we had a 1000 lt fill. We then noticed a strong oil smell when the boiler was firing up. There was no sign of an oil spill. Contacted our engineer to have the boiler serviced, still the strong oil smell was there. Recommended having new...
  11. J

    Wiring for ufh zone Worcester greenstar heatslave 18 25

    Hi, first im gas safe registered so know a bit about wiring but my own boiler is giving me a head ache. Worcester greenstar heatslave 18 25 oil i fitted a nest just linked ch from boiler demand to programmer demand all good. I now want to wire in another stat for my ufh but dont know what to use...
  12. M

    Greenstar Heatslave not producing vet limited amount of hot water

    Hi, would be extremely grateful for any pointers on this problem The full name of the boiler is the Worcester Greenstar Heatslave 18/25 Oil combi. The boiler has a 69L heatbank. We leave the water permanently set to on. When I run the hot tap nearest the boiler i get hot water as expected...
  13. H

    Worcester Bosch Heatslave 26/32 Hot Water Problems

    I have a Worcester Bosch Oil Heatslave 26/32 which is about 17 years old. It has developed a fault that has come in stages so it might be more than one fault. It was fitted with the OEM programmer. 1. When the water heating is on, but the room heating is off, the boiler sometimes heats the...
  14. S

    Worcester Bosch Heatslave 20/25 Hot Water Not Working

    Hey there, I have a boiler (Heatslave 20/25) that had low pressure. I topped the pressure back up to 1 bar using the external filling pipe but the heating still won't come on. Do I need to reset anything? Thanks for any help
  15. Christopher buzzard

    Worcester Greenstar Heatslave 18/25 oil boiler.

    Hey. Fairly new to oil. Serviced above boiler Last week. All working fine but now had customer call to say it keeps going to lockout. Been and looked today. Symptoms are the boiler ignition process will start. You can hear it sparking. The boiler will fire, run for around 1 min and flame will...
  16. T

    Advice please about fitting mixer shower from Worcester Bosch 25/ 32 heatslave oil combi

    Hello everyone. Looking for comments/advice please about my wife's latest request... Which is to remove the existing bath from an upstairs bathroom (apparently we don't like it anymore!) and replace it with a shower. The hot water is from an external oil combi also feeding a second bathroom...
  17. P

    Greenstar heatslave 2 query

    I am looking to fit a central heating system to my home which has none at present. I like the look of the greenstar heatslave 2 external oil combi. I would like to manage room heating with TRV’s and the Bosch easycontrol smart System. I am struggling to find anything definitive from Bosch that...
  18. B

    heatslave 12/18 no instant hot water

    greenstar heatslave 12/18 oil combi boiler, 9 years old. when my boiler fires up first thing in the morning its been making a banging nose but it heats up the hot water ok and central heating works ok. the hot water is set to come on by the timer on the boiler on at 5.15am off 9.am. if i use a...
  19. D

    Replacement diverter valve for Heatslave 20/25 OSO

    The diverter valve on my old Worcester Heatslave 20/25 OSO oil boiler needs replacing. It is a ACL A679B316-52L0 3 port 3 wire valve which is now obsolete. I have read elsewhere on the forum that a Drayton 679-3 can be used instead. With the helpful post on wiring the 5 wires into 3 I am...
  20. K

    URGENT Worcester Heatslave 15/19 Oil Combi Boiler Pressure

    My boiler pressure gauge is at zero so the boiler is not firing up. I thought I heard a small water leak in the wall near the boiler the other night, just before this happened, but the leak has now stopped. I have been reading other posts to try to find a solution and I've hunted everywhere...