my ferroli DOMI compact has got no hot water pressure, the water comes out hot when heating is on but only a trickle? is it possible the flow switch is the fault?
if your cold pressure is ok .then sounds like a platic filter or flow limiter inside flowswitch is partially blocked not letting enough water through to activate the hw on its own .try putting hw tap on its own and see if a tap symbol appears ? if not its blocked or if you live in a hard water area the heatexchanger could be scaled up inside
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