Baxi Barcelona, which has been upgraded to 100He spec
On the original control board there were 2 jumpers .. Both were removed as this boiler is connected to a thermal store
J1 to set to 100,000Btu/h J2 to turn off modulation
New board has 4 jumpers J1 Red J2 Blue J3 Blue J4 Yellow
Am I correct that J1 & J2 are the same .. and therefore should be removed ... and removing J3 should also be done to prevent limiting of output temperature
J4 remains as this is a standard short flue