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there is not a room stat or programmer connected to the boiler , it is just controlled by the dials on the boiler itself , i have changed the control panel and the lead from the control panel to the pcb , and ive now changed the pcb too , exactly the same tho , display reads 0 , hot water is...

thanks for that but there is not a stat connected to the boiler and i have changed the control panel but its just the same ?

have an isar he24 and it has worked fine for 2 years however it has developed a fault as it does hot water ok but wont do heating , im scratching my head as there is no fault code ?? display just says 0 , can anyone help ??