Blower motor continuously running

The indoor blower never shuts off.

Air Side

normal

Possible cause

Relay
Component
A low current coil switching a higher current load, and the relay types you meet in HVAC controls.
Thermostats and Control Wiring
Component
What each control wire does, how thermostat types differ, and how to troubleshoot a control circuit.

Local Code Notice

HVAC installation, venting, combustion air, ventilation air, gas piping, clearances, termination locations, electrical requirements, permits, and equipment requirements vary by jurisdiction and equipment. Always verify the applicable local codes, adopted code edition, regulations, permits, and manufacturer installation instructions before installation or service.