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Vaillant eco tec plus 831

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Chris w

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hi any ideas would be greatly received

leave stat set on timer - when boiler comes on rads only Luke warm - turn off power to boiler then turn back on again rads get hot - showering and washing up makes no difference rads stay hot.

When timer comes back on same thing -when boiler comes on rads only Luke warm - turn off power to boiler then turn back on again rads get hot - showering and washing up makes no difference rads stay hot.

Also left boiler turned off for 4 hours with no power yesterday - no difference.
 
Chris w said:
Hi it’s Wired timer (new fitted just in case wireless one was causing issue) which it wasn’t.
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