baxi luna 310 fi

installed a baxi luna 310 fi combi boiler worked great for 7 months then developed a problem with the DHW only getting up to 100 deg F did the usual strip down the 3 way mixing valve, check o rings and diaphrams, all seemed to be in excellent condition, stripped down the many pipes inside the boiler and made sure there was no dirt or debris, checked the wiring switched sensors around betwen the domestic and the heating still nothing changed the PC board as last resort nothing anyone ever worked on these that may have an idea that i may of overlooked? thanks dave
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