Hi, I have an Ariston EuroCombi that does not modulate up in hot water mode. I have replaced the diaphram in the diverter valve, the diverter activates the micro switches and the boiler switches on in response to a call for hot water, but the burners remailn low. Could it be a fault with the temp control stat, gas modulator or pcb - any ideas or process of elimination would be appreciated!
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