Carrier Furnace Control Board Troubleshooting

A circuit board in the most common system works off of input and output.

Carrier furnace control board troubleshooting.

Your ac system is more than just the outdoor unit sitting by the side of your home. This can easily be overlooked. The indoor unit should include an air filter that traps dust dirt and other airborne particles. Additional comfort enhancing functions on select models include ideal humidity system technology for relief from hot and sticky summer air and comfortfan technology which allows you to select furnace fan speeds from the infinity system control.

You can purchase a filter from an appliance hardware or retail store if you have your unit s. If code persists you need a technician onsite to properly diagnose ad repair. How to change the furnace filter varies with different carrier heaters so refer to your unit s manual. The truth is many homeowners have thought their carrier furnace wasn t working but all they needed to do was to turn on the system or turn up the heat.

First make sure you have power to the board. A hard lockout will automatically reset if the hardware fault clears. Most systems also include an indoor air handler unit usually a furnace or fan coil. In some cases this will be line voltage and in other cases the board will get its power from the control transformer.

Changing the filter was the only thing so far that might have helped resolve this. Repairclinic jumped to the last and least likely reasons for this error. That is true for air conditioner troubleshooting heat pump troubleshooting or gas furnace troubleshooting. Here is a picture of two limits and one rollout switch.

Reset power to the furnace. 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. The next most common step in ac troubleshooting is checking for a dirty air filter. Sometimes the thermostat gets turned off or the setting changed by accident.

Hard lockout if the control detects a fault on the control board the status led will be de energized and the control will lockout as long as the fault remains. 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.