How do you know if your control board is bad?
What are the Signs of a Bad Furnace Control Board?
- 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.
How long does 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.
What causes HVAC control board failure?
Failed transistors: The transistors in the control board are susceptible to damage due to power surges, static electricity, and age. Transistors are often the first part of a control board to fail. Loose wiring: The vibrations of the furnace over the years can cause wiring in the control board to shake loose.
How do you test a control board?
How to Test a Circuit Board
- Key Takeaways. A list of basic tools for circuit board testing.
- Start with a Visual Inspection. Look for burnt components during your visual inspection.
- Check the Power Module.
- Check the Input/Output Ports.
- Check Communication Ports.
How do you test a control board with a multimeter?
To test circuit board properly, touch the multimeter probes to the test points present on the board. Make sure while playing out this step you have your hands on the plastic portion of the probes. You can then go on to check either the voltage or resistance.
What is the cost of a furnace control board?
A furnace circuit board replacement can cost between $550 – $1,100, depending on how complex your system is.
What can cause a control board to fail?
What causes the furnace circuit board to fail?
- Loose wiring. After a certain period of time, the furnace wires will become loose due to the vibration.
- Clogged furnace filters. Debris and dust can cause the air filters to clog, resulting in the overheating of the blower motor.
- Dirty or wrong fuse.