Vaillant ecomax pro 18e condensing boiler

have you tried checking that there is no dust or dirt build up around the flow and return sensors ? this can be a prob if sited in loft or garage . sometimes a little wiggle of tem can work.
 
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have you tried checking that there is no dust or dirt build up around the flow and return sensors ? this can be a prob if sited in loft or garage . sometimes a little wiggle of tem can work.

The post is 4 years old. However, these days nearly every new contributor seems to announce their arrival by answering ancient threads.
 

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