One suspects there has been a wriging cockup or the pump was right for the installation in the first place.
Was the pump really installed incorrectly or have you misinterpreted?
Have you checked against the boiler, controller and thermostat manuals?
I wonder if the wiring to the controller and / or pump is wrong.
Did you disturb ANY wiring?
ANY?
AT ALL?
On the basis of what you told us, you have altered something
XXX
July 2016