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worcester 24i dhw fluctuating

Joined
4 Nov 2009
Messages
6
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Location
Cardiff
Country
United Kingdom
got a worcester 24i junior in my caravan, ch is working fine ,but have noticed that the hw is fluctuating , it starts cool as normal, then builds up to scalding hot then go from hot to cool and so on, ive replaced the thermistor, still the same i then removed the water turbine sensor and filter.
i cleaned and refitted the turbine, fired up dhw and everything worked as should for 2 weeks, it has now started playing up again, going hot to cool, i took the turbine sensor off again and blew through it, it seems ok, can i test this before i order a new part @35quid.
it seems to me that this must be the problem , or could it be something else?????

thnx for help in advance
 
As long as the flow rate is more than 3 litres/min I think your problem is sludge in the secondary heat exchanger, That is the small heat exchanger used to heat the hot water.
 

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