The Fuse Only Blows When You Leave - Short #307

HVAC School - For Techs, By Techs · Oct 13, 2026 · 14m

In this short podcast episode, Bryan talks about the fuse that only blows when you leave. The service call usually goes like this: you replace a blown fuse, the system runs fine, you leave, and then the fuse blows again. There could be several causes of a blown fuse.

First, ask what was happening right before the system stopped, such as if the unit was starting up, if it was raining outside, or if the operating mode changed. The customer may not know the specifics, but they may be able to offer a clue. If the control fuse blows during a specific call, we may be able to locate a short in one…