Free Returns (for 60 days)
Free Shipping on orders over $49The brain of most modern furnace electronic ignition systems uses an integrated circuit board to control many complex processes. These integrated controllers also perform self-diagnostics providing codes to troubleshoot operational problems. The integrated circuits continuously monitor the furnace's operation and the operation of the integrated control module itself. If a failure occurs, LED's can indicate a failure code. The codes are listed in the service manual and also likely on the furnace door.
