Here is how to test a furnace control board. Step one is to check your control board after gathering the required tools. Take Down Access Panels. Remove the access panels for your furnace using your screwdriver. The control board is usually located at the base near the blower. Inspection using sight and smell.

Quick Check: Verify your thermostat has power and the circuit breaker isn’t tripped before assuming board failure. Symptom: The furnace starts but shuts down after a few seconds or minutes, then repeats. Why It Happens: A faulty control board may misread temperature signals or fail to regulate heating cycles properly.

Technicians often use multimeters to test voltage and continuity at various points on the board. Proper maintenance helps extend control board life. This includes keeping the furnace area clean and dry, and ensuring good airflow. Regular professional inspections can catch potential issues early.

Age of Your Furnace: If your furnace is over 15 years old, replacing the control board may not be cost-effective. A new furnace could be a better investment. Recurring Problems: If the board fails repeatedly, the issue could stem from another faulty component (like a shorted motor or transformer) damaging the new board.