I was here to replace the transition assembly and to fix an exhaust leak on the furnace and to replace the wireless thermostat for the boiler. I removed the cracked transition assembly and installed the new one. I cut out the leaky pvc elbow on the exhaust pipe. I glued in a new elbow. Cycled the furnace, itâ€™s operating properly at this time. I removed the wireless thermostat kit from the boiler. I wired in the new wireless reciever and programmed the new thermostat to it. I cycled the zone. The sunroom is heating properly and the thermostat is working properly.