Blower Kept Running With the Thermostat Off in Raleigh
Lennox furnace · Raleigh · September 2026 · Dexter & Jeorell · From our service records

What the customer reported
A Raleigh homeowner in the 27615 area reported that the AC system was not shutting off. They tried turning it off through the thermostat and it was still blowing air.
What we found and did
Jeorell found that the furnace control board was sending voltage when the system was not calling for cool. In the attic furnace, the blower was running with no call from the system. It kept running even after he unwired the low voltage, and it only stopped once he pulled the cool, common, and heat plugs from the board. A new furnace control board was covered under warranty and installed, configured to be used as A2L, with the dip switches set for proper operation.