Greenstar 12i?
Hi, I have a Greenstar12i system boiler - When the room stat is turned up the boiler starts up and the burner comes on. It heats up for 20 secs or so, then burner knocks off and pump still circulates, but will not fire back up. Replaced primary thermostat and top limit thermostat, but no different - any ideas!
Patrick, May 2013
