Ours must be a a newer model Baxi 80Eco , as our plumber (non-heating engineer), our 2 builders & myself failed to locate the reset button inside the boiler. Proper heating engineer came out and reset it using the swtich on the front in 30 seconds (the one that is either "off"/"hot water only"/"hot water and radiators"), you twist it past the "hot water and radiators" option and it reset... £35 lesson learnt (it's xmas it could have been a lot more expensive).
Nothing about this switch in the manual either...
PaulL
December 2010