Education
January 9, 2026
The video demonstrates a simple no-heat repair for a furnace unit where the unit is running but has no negative pressure (0:01-0:12). The problem is diagnosed as a stopped-up pressure switch tube (0:58-1:02) due to rust in the pressure switch port (0:40-0:48).
The repair involves:
* Cutting off the unit (1:27-1:29).
* Taking off the pressure switch tube from the draft assembly (1:05-1:19).
* Cleaning the port with a small Allen wrench (1:31-1:37).
* Reconnecting the tube that connects the pressure switch (2:11-2:12).
After the repair, the unit successfully starts and the igniter lights, leading to the burner coming on.
