remove large chrome nut in centre of pump you should be able to see shaft spinning if not use small flat bladed screwdriver to spin shaft if shaft is tight or pump wont start you need new pump but first check for power to the pump
brian
March 2011
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.