siemans rdh 10/rf on a wb 35cdi. not communicating .new batteries in thermostat.it displays temperature and adjusts for rise on the circular button but boiler will not fire. the boiler recognises a demand for hot water and fires up.
the reset on the sender lights up the yellow button but nothing appears to work for c/h
the reset on the sender lights up the yellow button but nothing appears to work for c/h
