How do you know when your circuit board on a forced air HVAC unit is defective?


Typically you'll see bad power or no power going from point A to point B. However, there are a lot of A's and B's, so you really need to know what you're testing. There are some "flags" that can give you the idea it's bad but electrical testing is the only true way.

Updated on January 8, 2018

Original Article:

Troubleshooting Common Furnace Problems With an HVAC Expert
By Dan Robbins