If a customer’s system loses power for even a second during a storm and the fan starts running constantly afterward, the controller likely isn’t restarting on its own. Since these boards default to 24-volt control logic when they’re not communicating with the air handler, and float switches are typically wired between R and G, a blank or unresponsive display is a strong clue you’re dealing with this exact issue.
The fix involves installing a delay timer on power break (not make) so the controller waits out short outages instead of trying to restart too soon. The team walks through why break-delay timing matters more than make-delay, what to look for when wiring it into the circuit ahead of the board, and why documenting the process — not just generally, but down to the wiring specifics — is critical for consistent field solutions.
As a bonus tip, the guys also cover a diode fix for older 20 and 24 AGM model air handlers that get stuck running on the higher heat kit speed tap, an easy catch during maintenance or a service call that can meaningfully improve airflow and temperature splits.
Whether you’re troubleshooting an unresponsive Infinity controller, a constantly running fan after a power blip, or an air handler stuck on the wrong speed tap, this conversation covers practical, field-tested technical solutions you can start using on your next truck roll.
Topics covered:
Comments
To leave a comment, you need to log in.
Log In