alpha boiler fault

i have a alpha ocean eco 240 combi boiler and when i turn on my heating the pressure gauge goes wright into the red but is normal when cool (turned off) does any one know why

Reply to
ashavfc
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Get a man in

Reply to
Robbo

or read the SealedCH FAQ before doing so?

Reply to
Ed Sirett

Fault with the expansion vessle - easy DIY fix. See Ed's sealed system FAQ.

Reply to
John Rumm

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