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Alpha H CB33 boiler A and B lights flashing won't start what do i do?

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If the pressure gauge is showing below the green mark you need to top up the pressure by connecting the small flexi pipe underneath the boiler then turn the 2 blue taps located either end (slowly though) this will re pressurise the system and it should fire up straight away, hope this helps. KEEP AN EYE ON THE GAUGE THOUGH dont let it go to far above the green bar.

Posted on Nov 03, 2008

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I had an issue with turning off the fill valve on my alpha boiler and the pressure went to 1.5 bar when cold and rises to 2.75 when the heating comes on is this ok.


You need to check with the boiler/system specifications to discover the correct pressure.

An overpressure condition should be dealt with by a safety valve that usually vents to the outside of the building - if it is working correctly. There have been incidents of this external vent freezing causing dangerous pressure to build in the system. I understand a modification is simple and inexpensive but I don't know any details.

Our pressurised system runs at about 2.5 bar hot, or at least it used to do when it was younger...

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I've got a Alpha 240 e combi boiler..... Everything seems to be wor,kin ok but it won't start the ignition sequence .


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May 26, 2012 | Water Heaters

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I have an Alpha CB28 combination boiler and it is not working at all. The bottom neon indicator light is flashing every second and the helpline suggests it is a temperature sensor fault. I have had it...


try tapping the 3 relays on the pcb,"thats the circuit board under the front cover...
it sounds like a dodgy relay thats starts up the pressure fan in next to the flue....
maybe a dry solder joint,maybe a new relay needed....
its a common fault on this model..

Oct 15, 2008 | Heating & Cooling

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