Ferroli Optimax 25C- F26 & F3 error

Joined
26 May 2014
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Location
Birmingham
Country
United Kingdom
The boiler has thrown up F26 for a few years now, a simple reset & top up usually sorts it out, except now, after a long summer, it is being stubborn, and also showing up F03.

We DO have hot water

WE DON'T have heating

Am I right in thinking the diverter value is knackered? I can source one of so, but is it a DIY?
 
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Am I right in thinking the diverter value is knackered? I can source one of so, but is it a DIY?
you would be better sourcing a new boiler and fill your boots if you want to fit it DIY
 

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