I had my boiler pump replaced yesterday as the other one had stopped working. The guy said he had one on the van that would fit and the boiler started working again. Now I'm finding the radiators that are furthest away from the boiler arent getting quite as hot as they were before. The pump he put on has 3 speed which are 35 45 50 and he set it to 3 and the one he took off was 40 65 95 and was set to position 2. Its a grundfos pump & it's a fairly large house. Is this just coincidence or do you think I should call him back?