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Alpha cb 28

Joined
16 Oct 2009
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Location
Kent
Country
United Kingdom
Hello, just came across this forum in my search for a possible answer to my question. i have an Alpha cb28 combi and when the heating is turned on it stays fired up for a few minutes allowing some rads to get heated, then it shuts down and the B light flashes every 5 seconds. The hot water works fine. thanks
 
Are the rads turned on (pins not stuck on TRVs, lockshields not shut)
Is there a filter in boiler return that needs cleaning?
 
Faulty temp sensors are common. The later ones are white.
 

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