Search results

Good idea - why didn't i think of that -thanks :-)

I have a Drayton Lifestyle LP111 Si programmer and Siemens RDH10RF thermostat connected to a Vaillant Ecotec Plus combi boiler. The programmer's LED display is showing a message 'ser due' and is giving off a beeping alarm that stops if you push the 'dvance' button. The heating is not...