How do you diagnose a bad furnace control board?
How to check if your furnace’s control board is bad
- Remove the furnace’s access panels.
- Inspect the control board.
- Check the control board diagnostic light.
- Test power going into the control board.
- Jump the thermostat terminals.
- Test the power coming out of the control board.
How do you reset a furnace control board?
How to Reset an Electric Furnace
- First, turn off the power supply to the furnace by turning off the breaker in the circuit box.
- Locate the reset button on the furnace and press it to reset the furnace.
- If the button is popped up, press it down.
- Return the cover to the blower compartment and turn the power on.
How long should a furnace control board last?
10 to 15 years
A furnace circuit board lasts 10 to 15 years on average, depending on the furnace condition, usage, and level of maintenance.
How long do furnace control boards last?
Why would blower motor stop working?
The most common causes for AC fan blower motor not working are blown fuse, bad relay, resistor or control module malfunction and faulty blower motor. However, a bad electrical connector or broken wire, or a defect in the climate control unit can also cause the blower motor to stop working.
How to troubleshoot a furnace blower motor?
A third quick and simple troubleshooting step for your furnace blower motor is to make sure the filters and vents are clean and free of dust and debris. To do this, go to each of your home vents and ensure they are open and clear. Next check the cold air return filter for dirt or dust build up.
Why is my furnace’s draft inducer not working?
If the furnace’s draft inducer will not start or if the blower motor will not start then this could very well be a control board problem. I hope the YouTube video below will help you troubleshoot your furnace’s control board.
How do I know if my furnace control board is bad?
Common warnings signs that your furnace control board is bad include: Warning lights on your furnace’s diagnostic system (see step 1 below) Temperature instability (especially when the thermostat is ok) and Interruptions in the normal sequencing of your furnace
Why won’t my furnace start?
If any of the safety controls like the furnace’s limit, rollout switches, or pressure switch are open then the control board will not allow the furnace to start. Here is a picture of two limits and one rollout switch.