Staring at an E74 error code? Here is exactly why your heating system stalled.
The E74 code triggers when your home temperature fails to rise after a heat call.
Common culprits include dirty air filters, faulty igniters, or wiring issues between components.
Nest starts a 30-minute timer the moment it sends a signal to your furnace.
Check your furnace status and replace the air filter before calling a professional technician.
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