There was a problem with the fuse on the HVAC board frequently closing. It turned out that the service technician was pulling hard on the wires in the external AC unit and scratched an unused thermostat wire, exposing an internal wire that occasionally made metal contact and shorted out. I bought this pack to use in troubleshooting. I looked through 4 fuses until I found the cause. Since then it has worked flawlessly. The best price I've found for 3A fuses.
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