Proper HVAC maintenance can help you avoid many common condensing furnace problems.
- But even so, your condensing furnace may, at some point in its lifespan, break down, and troubleshooting it may help restore its operations.
Begin your condensing furnace troubleshooting at the thermostat. Make sure that your thermostat is on heat mode and its setting is above your room temperature. It is best to set it to the highest possible setting while you carry out the troubleshooting procedure. If the condensing furnace fan is not working, set the fan at the on mode. Check the fuse, breaker, and switch for the condensing furnace. If the circuit breaker tripped, leave it off and proceed to check the wiring for any loose connections. Look for burn signs on your control board and replace the board if you find any burn spots. If there are no blown fuses or the breaker wasn’t tripped, check the inspection window of your blower compartment on your furnace. There should be a flashing green light. If there is no light, neither green nor red, the issue could be your transformer, furnace control board, thermostat, blower motor, or the run capacitor. If your condensing furnace uses a standing pilot, make sure that it is on, and the flame is reaching the tip of your thermocouple. If the pilot light is on, but the main furnace burners do not come on, feel the side of your condensing furnace. If the side is cool, the issue could be the furnace control board, thermostat, valve, or limit control. If the side is warm, allow your furnace to cool before continuing to troubleshoot.