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Alpha c27 boiler combination

A & B flashing no fan running or pump running

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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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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check out ur pump sounds like its scized up check it out give the pump a good hard wack if this sortis it u will feel and hear pump running if its scized up bad u will need to replace it

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Google Alpha boiler you should be able to down load a online manual with a ff chart in it . which should have codes in there for flashing lights .

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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 .


could be air presure switch which tells pcb that fan is working and would then bring inn ignition system then main gas valve.Would suggest getting gas engineer in.pommie engineer

May 26, 2012 | Water Heaters

1 Answer

Boiler not working


When the fan stops working it also stops the boiler. Safety.
Check that the fan is turning and blowing air out. You can hear it turning at the top of the boiler and at the vent pipe exit.
With the electrics off, remove front cover and test the fan by moving the blades by hand. Any element of stiffness or jerking or if the fan does not turn freely - replace. These have an induction motor - no repair
Check the electrical contact wires to fan are ok. If the fan is ok check also the 2 plastic tubes to & from the air pressure unit [usually close to one side of the fan] are intact [no splits or holes and will maintain pressure and vacuum] and fully connected to their metal terminals.
Next is to examine the pcb (the electronic board behind the switches) Look for any block connections loose and any obvious signs of black marks on the board. If the latter, replace

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1 Answer

My alpha cb24x combi boiler keeps blowing the main fuse,even when its not on,this can happen in 2mins or 2 days after i redo the fuse using 15 amp wire, why is this happening ?


a short circuit most likely on the pump or another winding, fan or gas valve. start with shutting off the power and pocketing the fuse untill ur done . dissconnect the pump supply and fit terminal blocks to make them safe. then turn the power on , but do not let the boiler run on either water or heating . let it sit for a spell and if the fuse does not blow simply replace the head of the pump, which is easier than replacing the complete pump. remember yuor not allowed to touch the gas train.

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1 Answer

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it sounds like the problem may be in the boiler and not the controller itself. Do you kno which is are the two wores that are the r-w for the thermostat take and purt them together and see if the boiler stays on or shuts off like it does with the thermostat. If it does then replace the reciever. If it doesn't then you have another problem. Good Luck

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1 Answer

Fault light flashing 1 flash per second


Prior to writing the above fault I had asked the owner to turn the boiler temp controller , for the heating side, down just a fraction . I was phoned this morning to tell me that the boiler had stayed on allnight with no fault light . After consulting with the plumber who fitted the system it appears that there might not be a room stat ,

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