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one room suddenly stopped working
Hello all, and thank you for reading. I have a radiant floor heating system in my new home . 3 stories, 2900 sqF, and using a Navien Boiler and Taco controllers. There are 6 zones, and one zone does not work suddenly. I replaced all thermostats with NEST , and it worked fine. I had the system service and it worked fine. Then it stopped about 2 weeks after the service call as described above. Also, this am , the boiler basically stopped working and the word " AIR" flashed. I reset the boiler and all is well. Please help!