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Have tried isolating the central heating side ( turning to DHW only and shutting rad supply by ball valve under boiler) Turning on hot tap, boiler lights, very hot primary side but only tepid at tap. Not sure where the heat is going but only ran for a little while not wanting to do more damage...

Our Ariston Eurocombi A/23 MFFI has a problem on the DHW side. Boiler fires up, microswitch for DHW is working. The temp setting on control panel is at max indicator lights working going up to 80 degrees but water coming from tap is only around 35 degrees. Have removed DHW heat exchanger and...