Worcester greenstar heatslave 12 18 problem

[martinjc]

hi all

Hope someone can help me out here, I have the above boiler it's oil fired and there's plenty of oil in the tank on the hot water side everything works great boiler comes on on demand all year round not a problem works a treat.

Now on the ch side 7 out of 10 times it trips out when the ch is called for which in turn kills the hot water until reset then everything is fine again, any ideas where to start looking i fitted a new pump and nozzle last year aswell as a good service but that hasn't fixed it, when its working its brilliant ?????

 

[oilhead]

What do you have to press to restart it? Burner, flue or limit stat.

 

[martinjc]

I press a reset which is at the top left underneath the control panel underneath the hot water control, i have to remove the front panel to gain access

 

[tincup]

I would say the boiler is operating properly with the info we have and that the controls (3 port valve), a pipe blockage or air lock on the CH side maybe to blame

 

[martinjc]

The ch has been bled and re presurized numerous times, i dont think that's the issue, all radiators have full heat and no pressure loss at gauge

 

[oilhead]

What temperature are you running the central heating at? If towards the top of the range, try turning it down whilst it is still relatively warm. The boiler is going out on high limit which is usually associated with circulation problems. You could try removing the diverter valve actuator and see how free the movement of the valve is. It may be partly obstructed on the heating port.

 

[martinjc]

Ok will look into that

 

[Burnerman]

Have you bled the pipes on the top of the boiler?
John

 

[martinjc]

No bleeds on top of the boiler

 

[Burnerman]

Aren't there two manual vents and one automatic vent on these?
John