worcester high flow 400 cuts out...

Joined
27 Feb 2007
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Location
Ayrshire
Country
United Kingdom
Hi guys.
This problem is driving me nuts. I have a Worcester high flow 400, 7 years old. For the first 5 years or so, no trouble. Since then I have had the fan, pump, temp sensor replaced. I have had the plate heat exchanger removed, cleaned through(not much crap) and refitted. Now the constant problem is the boiler cutting out via the overtemp sensor tripping. Before I call out Worcester (probably costing at least 2 limbs), any ideas? Big old house, lots of rads, all air out.
Thanks in advance!
 
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It's going to be blocked, if not the dhw hx then the filter in the top manifold.
 

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