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Fiddled taking battery in and out for an hour (whilst watching TV), no joy - red light flashed for 6 or 7 seconds and RF601 appeared to switch from off to on and vice versa (but no function on override). After about hour, when I put batteries in (exactly as I had done 30 to 40 times before)...

Vaillant EcoTEC 837 fitted jan 08 on a 3 year warranty offer. we had intermittant days when boiler didn't fire but fired is power cycled. Vaillant services 10m ago and replaced motor. CH has been off in summer mode - CH won't go. Drayton Digistat SCR Wireless (RF601) appears to send OK...