Ravenheat Little Star combi not working properly after drain

[Cliff]

Just drained down CH as a lockshield valve was broken & had to be replaced. Did it myself, but since filling system back up there have been problems. When the HW taps are open or the CH sytem is on the bolier starts, but then goes off & comes on. No HW & CH not working efficiently. Sytem fitted with Auto diverter valve, so could not manually open it before draining down.

 

[ChrisR]

Check for an auto air vent in the boiler - usually by the pump or at the top of the appliance. It will have a plastic screw cap, which should be left open a turn or two.

 

[Cliff]

Thanks for info - opened air vent a little more - still have a problem with burner cutting out when one of the taps running. If I have two taps running the burner does not cut out ? any idea

 

[PEDANTICVINDICTIVEMAN]

Not such a little star now, bless it.