vaillant eco tec plus 837 outside sensor needs cleaning

Joined
17 Aug 2014
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Location
Moray
Country
United Kingdom
Hi,
Our outside sensor keeps giving an error message on the inside control panel and says it needs cleaning and sets temperature to 0.
However when it is cleaned nothing changes and the error message stays there. Sometimes it clears after a week or two but this time it doesn't seem to have fixed the problem. Can anybody offer me advice on what to do about this please?
Many thanks!
 

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