Our boiler has loud banging and locks out. Checked pump and pump had stopped. Have Kamco flushed the system completely (6hrs) changed 3 x TRVs in bedrooms,changed Pump . Everything great for about 3 hrs! Then banging started again , would this be stat problems? (over limit or boiler stat?)
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.