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  1. P

    worcester heatslave 20 / 25

    hi guys going to replace a heatslave 20 25 for a new condencing 18 25 this will be my first install on oil any tips would be really helpfull i do about 3 gas boilers a week so should be ok but any tips would be great cheeers in advance pete
  2. N

    Worcester Heatslave 18/25 3.7mtrs higher than the tank.

    I have a Worcester Heatslave 18/25 boiler installed 3.7 mtrs above the tank. Will a twin Tiger loop pull the oil up on a 10mm twin pipe system or not? Any thoughts please.
  3. S

    Worcester Heatslave 12/14 - How do I rebuild pressure?

    Hi I have a Heatslave 12/14 that has lost it's pressure - I have no idea how to rebuild this and cannot work it out from the instalation/servicing manual I have. Help greatly appreciated :)
  4. C

    Bosch heatslave 20/25

    Hi, I have a bosch heatslave 20/25 oil fired boiler with a slight problem, the central heating works fine but the hot water out of the tap starts off warm but soon runs cold or just cool, could this be the heat exchanger, any body help please. Thank you, Chris.
  5. M

    How to bleed worcester heatslave 15/19

    Hi guys, Can anyone help! Ran out of oil. Does anyone know how to bleed the Worcester Heatslave 15/19 oil boiler? The lockout light is also on. thanks, mems.
  6. C

    Worcester Heatslave 12/14

    I have a Worcester Heatslave 12/14 boiler. For the first time ever I have run out of oil and it has locked out. I am awaiting a delivery of fuel but suspect that I am likely to have a problem restarting due to the possibility of air in the system. Could anyone give me a Dummies Guide on how...
  7. J

    Worcester Heatslave Senior 20 asbestos?

    Hi, Im thinking of removing this older boiler for a friend... but would like to know if it contains asbestos before i begin to remove it.. Cheers for any advice..
  8. R

    Heatslave 18/25 (internal) cutting out.

    Asked to service and remedy a fault on the above boiler. It cuts out after 15 minutes, then eventually runs for a shorter and shorter period. The motor continues to run, pump pressure stays puts, its like the fuel supply is cut off. It takes a couple goes on the reset button for it to fire...
  9. SimonG

    Old Worcester Heatslave ACL Valve.

    In the past I have just ordered the replacement Drayton valve when the old ACL bites the dust. Phoned HWOS this morning for one and was told it's been discontinued by worcester and no longer available. Couple of us have had our heads together and going to replace it with a honeywell valve...
  10. T

    Rising pressure in oil combi boiler (Worcester Heatslave 20/25) system

    Hello First post, hoping somebody can help me with some advice. I'm not particularly technical so bear with me. I noticed last night that there was hot water trickling out of an outlet pipe on the outside wall by my Heatslave 20/25 boiler. Taking the front off the boiler I could see the system...
    • tokenwelshman
    • Thread
    • boiler combi combi boiler heatslave oil pressure rising system worcester
    • Replies: 1
    • Forum: Plumbing Jobs | The Job-board
  11. C

    Worcester Heatslave 12/14 oil boiler overflow problem

    I have a Worcester Heatslave 12/14 oil boiler. Recently I have noticed that there is a constant trickle of water from the boiler overflow. This is particularly annoying as I am on a water meter. The guage inside the boiler is not reliable. The reading is usually just above zero (red pointer...
    • colin2907
    • Thread
    • boiler engineer heatslave needs oil oil boiler overflow problem recently water worcester
    • Replies: 3
    • Forum: Plumbing Jobs | The Job-board
  12. L

    Worcester Heatslave 20/25 LockOut

    Hi, My boiler has locked out due to running out of oil. I don't know where the lockout button is? Can someone advise me please?
  13. H

    Lockout on Worcester Heatslave 12/14

    I have a Heatslave 12/14 with the oil tank about 6m higher than the boiler so the supply line is fitted with a pressure reducing valve at boiler level. These valves seem to have a life of about 3 years before they resrict the flow to the extent that the boiler locks out. I am now waiting for...
  14. T

    Problems with oil fired Heatslave boiler

    I have a Worcester Heatslave oil fired combi that yesterday stopped supplying heat to the radiators for apparently no reason at all. The boiler was working fine with all the radiators hot and plenty of hot water from the taps, the pump was running although very hot and the pressure had...
    • tonytimms
    • Thread
    • boiler everything fired heatslave oftec oil problems radiators water working
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  15. A

    Worcester Heatslave 15/19 overheating

    Can anyone help me? A friend and I installed 2 new radiators in my house about a month ago although we had the problem on and off beforehand. It seems to overheat and shut down almost every day. We have to press the overheat button to get the boiler to fire up. I have been round several times...
  16. B

    How to pressure a worcester heatslave 20/25 ?

    Hello, I am french and I bought a house in France where the english owners who renovated the house installed a worcester system whereas this firm is not represented at all in France, and the plumbiers don't know unfortunately this system. I need help because I can't located and understand the...
  17. B

    connecting underfloor heating control box to worcester bosch heatslave 15/19

    as the title says really where does it connect to on the boiler, all the wiring diagram for the control box says is earth, nuteral and switch live. where do you take them from on the boiler do they come off the room stat connections on the boiler?
    • BenC
    • Thread
    • bosch connecting control heating heatslave ufh under floor heating underfloor underfloor heating worcester worcester bosch
    • Replies: 0
    • Forum: Plumbing Jobs | The Job-board
  18. R

    Worcester Heatslave oil 20/25 electrical issue

    My Oil fired Worcester Heatslave makes a strange loud click every so often, it sounds like an electrical contact as it happens all the lights in my house dip for a split second, the boiler does nothing its when the boiler is stood idle no call for heat as the room stat is up to temp. All I can...
  19. C

    Worcester Bosch HEATSLAVE 20/25 ignition failure

    Hi. I've got a Worcester Bosch Heatslave 20/25 oil fired boiler and the burner has stopped igniting. I have done a fair amount of fault finding and this is what I have found: If there is a demand from either the hot water, or the heating the burner blower starts, but there is no ignition. It...
    • CraigT
    • Thread
    • bosch control failure heatslave ignition photocell solenoid worcester worcester bosch
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  20. H

    Worcester Heatslave 15/19 Can't find filling loop

    Hello, new here. I've a Heatslave 15/19 with very low pressure of around 0.1 bar when the boiler is not firing. It must be a sealed system, since there are no water tanks in the loft. I have searched high and low and cannot find the filling loop. The boiler is under a kitchen worktop, so...
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