I've a grundfos stp2.0b pump boosting the pressure in the house for the bathrooms and shower. The kitchen tap downstairs has the hot water coming through the pump, but the cold water appears to be direct as main supply is under the unit and the pump doesn't engage. Pressure is good on the cold.
Problem I'm having is on the mid point of the tap the pump won't provide a low enough pressure of hot water to mix so it's cold, or the pump pulses on and off. End result is the single lever mixer tap having either full on hot or cold water.
Any suggestions how to solve this? the house, pump, tap etc. is only a year old.