Fix Fault Heatslave

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We have 247 questions about fixing 'heatslave'

How to switch off lock out light?

Worcester Heatslave combi oil boiler The lock out light is on, I cannot find the switch to put it off . I ran out of oil, so this may have added to the problem. Have oil now but boiler not working.


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how do i ignite my boiler?

I need to ignite my boiler after oil refill. It is a Worcester heatslave 20/25


worcester oil heatslave 20/25?

worcester oil heatslave 20/25 combi boiler has stopped working, its like no power is going to boiler, have changed the fuse and checked the breaker but still nothing, no lights or timer on, any ideas.


How do I raise the pressure on my boiler after bleeding radiators?

How do I raise the pressure on my worcester heatslave 20- 25 oil boiler after I have bled the radiators


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combi oil Worcester greenstar heatslave 12/18 switches off?

I have a internal combi oil Worcester greenstar heatslave 12/18 Its has a built programmer and Hot water temperature control and Central heating temperature control dial both marked from 1 to 6. ... more


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Expansion vessel full of hot water?

I have a Heatslave 20/25 and it stopped pumping water around the system. I thought it was the pump, but the expansion vessel is full of very hot water and may be the problem. Can you advise me?


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how do i remove air from my worster greenstar heatslave 12/18?

how do i remove a air lock from my worcester greenstar heatslave 12/18 oil filled boiler