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Weil_McLain Ultra 105 Boiler
Had a new Weil-McLain Ultra 105 Series 3 boiler installed November 3, 2017. We use propane. Worked great for two years. On December 23, 2019 it wasn't maintaining temperature. Repair guy,who installed it, came and looked at it and couldn't figure out what was wrong with it. He talked to tech support and was told it needed a clean-up kit and to set it at high altitude setting until he got the clean-up kit. Repair guy returned on December 30 and installed the clean-up kit. Worked great until January 10, 2020 when it was not maintaining temperature again. Repair guy once again could not find the problem. He called tech support again and was told to set it at high altitude setting and leave it there because for some reason it required more oxygen. That is where it was left.
My question is, why did it work great for two years with no problems and now it needs more oxygen? To me it seems that some part must be failing to cause this.