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no hot water?

my sime super 90 boiler recently had a new fan fitted which repaired the boiler problem , but now my hot water is very erratic it is hot for about 20 seconds then goes cold, I have been advised that my dhw thermistor might be the culprit ,can anyone confirm this please?
robert linney, September 2011
two thing which doing this NTC or hot water heat ex changer need take out and clean with acid if water runs hot and cold

ltd, September 2011
link Click here to see other fixes for Sime Super 90.