had 2 new pumps fitted to conventional boiler.1 for water,1 for heating. both water and heating switches have to be on for heating to work. since the new pumps have been fitted the water pump is noisy. reason being when both switches are on it's noisy,but when i turn water switch off the noise stops whats the problem and how can i sort it
Also get said moron to set your programmer to gravity so that CH will bring on DHW automatically when called for alone. Plumbers make me laugh.
This is the old guaranteed warm system right? Look in the airing cupboard above the primary flow connection on the cylinder and you should see a air vent. Try venting it with the pumps switched off (this is the most likely cause).
out/should it have been air It should have if that had been the fault - but if water came out then that's OK. Thats the obvious ruled out then! 1. Check the bleed screw located on top of the pump itself for air, if water comes out it's OK.. 2. Try turning the speed on the pump to high to see if this does anything.