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  1. 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.
    • Steve S
    • Thread
    • america fired heatslave usa
    • Replies: 1
    • Forum: USA
  2. 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...
  3. 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...
    • steve 01442
    • Thread
    • america heatslave usa
    • Replies: 5
    • Forum: USA
  4. 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...
  5. 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...
  6. 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...
    • jakeh83
    • Thread
    • forum greenstar heatslave plumbing ufh wiring worcester zone
    • Replies: 3
    • Forum: Plumbing Zone
  7. 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...
    • Marcopf
    • Thread
    • america amount greenstar heatslave hot hot water usa water
    • Replies: 48
    • Forum: USA
  8. 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...
  9. 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
    • s7e
    • Thread
    • america bosch heatslave hot hot water not working usa water worcester worcester bosch working
    • Replies: 12
    • Forum: USA
  10. 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...
  11. 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...
    • Techie
    • Thread
    • about advice america bosch combi fitting heatslave mixer mixer shower oil please shower usa worcester worcester bosch
    • Replies: 5
    • Forum: USA
  12. 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...
    • Peter9876
    • Thread
    • america greenstar heatslave query usa
    • Replies: 4
    • Forum: USA
  13. 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...
    • bluesriff7
    • Thread
    • america heatslave hot hot water instant usa water
    • Replies: 14
    • Forum: USA
  14. 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...
    • Dave65
    • Thread
    • america diverter diverter valve heatslave replacement usa valve
    • Replies: 2
    • Forum: USA
  15. 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...
  16. Ryooo

    Heatslave 25/32 No HW

    Hi guys just installed an oil 25/32 external Worcester Bosch Heatslave External boiler. I can't get hot water. Central heating is fine. Comfort rf fitted and seems to be working fine. Link wire has not been removed. The sensor is not registering the dhw lts per minute display. Any help...
  17. G

    Which nut to bleed heatslave 12/18?

    Need to bleed the boiler heatslave 12/18. Has a nut above threaded pipe and one below, which one do I loosen.
    • gjb
    • Thread
    • america bleed heatslave nut urgent usa which
    • Replies: 12
    • Forum: USA
  18. R

    Heatslave 20/25 surge

    My Worcester 20/25 is producing an intermittent surging noise, I reckon it's a similar noise to when I have had air in the fuel line after fitting new fuel hose. Could this be fuel starvation noise from clogged fuel filter. I'm told the fuel filter at the tank has not been changed since install...
  19. R

    Nest wiring for a new Worcester heatslave 11 combi 18-25 3amp nest 5amp boiler

    Replacing a clients old standard boiler with new oil heatslave 11 combi 18-25. It has a nest wired in and looking on the instructions it says 3amp max to nest but the boiler requests 5amp. Anyone with suggestion around this. Im sure there are plenty nests wired in to oil boilers. Thanks...
    • RayPlumb
    • Thread
    • america boiler combi heatslave nest new usa wiring worcester
    • Replies: 5
    • Forum: USA
  20. H

    Kerosene Boiler Worcester 12/18 Heatslave "hot water expansion" !

    This heating system is new to me, in reality about 8 years old and in good condition. In the tail end of last winter's heating season, I think I shot myself in the foot. With more bedrooms than occupants and a water cost of about £4/tonne, I had a water meter installed. It might have been a...
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