i have replaced my Landis & Gyr RWB200 CH programmer, with a Myson 2MEP 2c Dual programmer
All the settings are correct on back I.E. 'I' '7' (5/7 day) and 'P' for Pumped.
however when powering up, both CH and water came on , but no display?
non of the buttons did anything?
with mains...