Arrived on site customer stated that a they have no heat. Upon inspection found that the spill switch was closed reset it and ran the unit . Found that when it reached temp. The boiler was not shutting down but the damper would close and the unit was still firing causing the spill switch to go off. Contacted tech support and due to a 24v wire powering the control module when the leg for the high limit broke it was still pulling power from the 24v wire keeping the burning running they recommend removing the 24v wire. Ran unit and it was shutting off and on as it should. Recommend replacement of high limit switch and having a chimney company come out and inspect the chimney as per tech support. Homeowner would like to wait before making any repairs or inspections due to it operating as it should.