GMC Heating & cooling combined unit Parts — Browse All Models

GMC heating and cooling combined unit safety tips

• Conduct yearly maintenance. Have a HVAC service technician inspect, clean and perform required maintenance on your central air conditioning system annually. The service technician will examine the unit thoroughly for possible safety hazards such as worn components and shorts in the electrical system.
• Change the air filters regularly. The air filters remove contaminants from the air in your home. Use allergen air filters to remove dust and pollen that can cause breathing problems.
• Disconnect electrical power from the heating and cooling combined unit anytime you perform maintenance or access internal wiring or components to complete repairs.
• Read and follow all operational and safety instructions in the owner's manual for your heating and cooling combined unit.
• Have a service technician examine and repair the heating and cooling combined unit whenever it fails and you're not able to fix the problem with simple troubleshooting steps described in the owner's manual.

How to troubleshoot your GMC heating and cooling combined unit when it won't start

• Check for electrical power.Check the house circuit breaker for the heating and cooling combined unit to make sure it’s turned on. Reset the circuit breaker if it’s tripped.
• Check the condensate drain.Heating and cooling combined units often have a float switch mounted on the evaporator condensate drain pipe that shuts off the air conditioner if condensate water isn't draining. Shut off power to the heating and cooling combined unit and check for condensate water backing up in the evaporator drain system. Clear the drain to reset the float switch and restore power to the heating and cooling combined unit.
• Check the thermostat. Make sure you have the thermostat set correctly. Adjust thermostat settings if necessary. If the thermostat doesn't have power, check its wiring and reconnect any loose wires. Replace the thermostat if it isn't working.
• Examine the electronic control board. Disconnect electrical power to the heating and cooling combined unit and check the electronic control board wiring connections. Reconnect any loose wires and repair any broken wires. Check for burn marks on the circuit board and replace the electronic control board if you see burnt spots or melted wires.