Does the motor warrant more thorough testing? Should I get a Zebra VZ-7 Analyzer? What else could be wrong? My Bryant dealer charges $170/hr, so I have to do as much of this I can myself and I’m not ready to give up since I already have so many new parts in this furnace.The Bryant Evolution™ furnace series showcases the brand’s top-of-the-line models. The code appears 20 seconds after the blower starts moving. I reinstalled the blower and and I got a 41 code when I tested with the blower door installed and a 44 code when I retested with the door open. All the leads had between 5.6-5.8 ohms, so that seems okay. I’m considered buying a Zebra VZ-7 Analyzer to do more testing, but first I took the blower motor out one more time and tested the windings for shorts and for resistance. In the meantime, one of the YouTube videos I watched said that the TECMate Pro didn’t do a very thorough test. It didn’t make sense that that was the issue based on the error codes, but not knowing what else to do, after a few days of considering my options, I ordered a brand new Carrier OEM Inducer motor for $260 and installed it. He suggested that he wouldn’t put the money into an old one and I should just buy a new one. He said the motor couldn’t be replaced separately and the induction assembly was $1,200. After two hours and multiple calls to other people, the tech announced that “someone at Bryant had the exact same problem” and the issue was really with the induction motor. The next day he came back and the motor passed the TECMate Pro test. After having a frustrated tech work for three hours trying to track it down (along with calling in a coworker for another hour or so.) he ordered a TECMate ECM tester (which he surprisingly didn’t have) and said he’d be back the next day. After the swap it had the exact same code errors, so I called my local Bryant dealer. Since I had some initial seemingly random codes flashing when the problem first occurred, I took a calculated risk and bought a new variable speed board (HK42FZ012) and replaced that. The house ducting has not been changed and I completely removed the filter for this testing so there shouldn’t be an issue there. When I ran the component test it flashed the 41 code (Blower Outside Valid Speed Range). The fan started working, but it kept flashing the 44 code (Blower Calibration Fault). I picked up a used/tested ECM module (RMOD52AE120) on eBay and installed it. I took the 1 HP blower motor (HD52AE120) apart and found a capacitor fried to the thermister in the ECM. I have a 14 year old Bryant Plus 90i 355MAV that had blower issues the day after a neighborhood power outage.
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