Background: 2-ton Trane XV18 heat pump + TAM9 air handler. Installed January 2018 by an hvac-talk contractor. Stat is a 1050 that was replaced with a new 1050 in June 2021 (the original stat had a flickering screen and eventually stopped working). Evaporator coil was replaced under warranty in September 2021 due to a leak. Stat is connected to wifi so theoretically should be running the latest firmware. System has a Comfortlink II zoning system. System has been working perfectly fine in both heating and cooling modes all winter and so far this spring.
Issue: A technician (who I believe to be very knowledgeable) was at my house earlier this week for spring preventative maintenance. Outdoor temperature was about 70. Indoor temperature was about 73. The technician reported that the compressor would not turn on when he put the system into "charging mode-cooling." Everything else (indoor fan, outdoor fan, etc.) would turn on in "charging mode-cooling" except the compressor. The tech spent an hour on the phone with Trane tech support, tested various parts of the compressor for shorts, tested the wiring harness, and who knows what else, but could never get the compressor to turn on during "charging mode-cooling."
Tech ended up going into the installer settings and just manually running the system at 100% compressor speed to check the charge, and said that's a decent simulation of what would happen during "charging mode-cooling." Compressor worked fine in that mode.
Anybody ever seen anything like it? The technician and Trane tech support ended up concluding it was probably either a faulty thermostat or just a software glitch that might be fixed in the next update. Recommended waiting until fall preventative maintenance to see if its still doing the same thing.
Thanks in advance for any insight.
Issue: A technician (who I believe to be very knowledgeable) was at my house earlier this week for spring preventative maintenance. Outdoor temperature was about 70. Indoor temperature was about 73. The technician reported that the compressor would not turn on when he put the system into "charging mode-cooling." Everything else (indoor fan, outdoor fan, etc.) would turn on in "charging mode-cooling" except the compressor. The tech spent an hour on the phone with Trane tech support, tested various parts of the compressor for shorts, tested the wiring harness, and who knows what else, but could never get the compressor to turn on during "charging mode-cooling."
Tech ended up going into the installer settings and just manually running the system at 100% compressor speed to check the charge, and said that's a decent simulation of what would happen during "charging mode-cooling." Compressor worked fine in that mode.
Anybody ever seen anything like it? The technician and Trane tech support ended up concluding it was probably either a faulty thermostat or just a software glitch that might be fixed in the next update. Recommended waiting until fall preventative maintenance to see if its still doing the same thing.
Thanks in advance for any insight.
source https://hvac-talk.com/vbb/threads/2238546-Trane-XV18-Compressor-not-turning-on-in-quot-charging-mode-cooling-quot-but-otherwise-works?goto=newpost
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