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tried that but just the same. Then removed it, switched off & started again - only this time remembered to push the reset as told in the manual. Worked!! You star - thanks!!! :lol:

boiler seems ok - some sort of glowworm thingy. Have put old rwb2 back in & it worked OK again. Then put new rwb29 back in & same thing happened - something makes a new noise as though the instruction is getting through, but main burner stays off. Room & boiler thermostat settings...

had an RWB2 controlling CH only which worked OK, but clock was bust. Swapped it for RWB29 which went straight onto backplate and seems to function properly - ie. lights come on when meant to! Trouble is the main burner doesn't come on when the demand for heat is there, just stays on pilot...