My furnace has power through the primary power source. The fuse is good, but the indicator light still isn't working. Will a bad thermostat cause this, or do I have something else going on?


You could check the power at the transformer for 24v/120v just in case, but it may indicate the board is bad. Is everything else working? There is a slim chance that the bulb is bad, but it's happened before.

Updated on March 8, 2018

Original Article:

Troubleshooting Common Furnace Problems With an HVAC Expert
By Dan Robbins

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