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Thanks Simon - Display appears to be OK compared with the user instructions and all appeared OK during the programming exercise. I'll try re-seating it per your recommendation and try the Honeywell if all else fails. Dave

I have just replaced a Landis & Gyr RWB2 programmer with a Select 207XL. After fitting, my Baxi back boiler does not fire up. When I put the RWB2 back in place all is OK. On the back plate, which I have not disturbed, there are connections to pins N, L, 3 and 4. The middle pins, 1 and 2...