Have HVAC Questions? Ask an HVAC Expert for Answers
Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.
The main blower usually runs as you describe when you hav an open limit circuit/device. This could be the high temp limit or a flame rollout switch (see attached pic for typical) near the burner or sometimes on the exhaust fan. You can reset the rollout by pushing the small button in between the 2 wires. If it clicks you have reset it.