To know he call. Service tech was out last week replaced Roll out limit and thought the cause of the issue was the chimney after we left the roll out popped. And she did not try to start the system until she got her chimney cleaned. Arriving to the job a push the rollout back in and system seem to start up with no problems. Supply temp is very hard and it’s coming back hot on the return. System is operating properly at this point s#361400689 Also bled out radiators to make sure it was not air bound.