Eric Smith

How to Troubleshoot HVAC Malfunctions

To diagnose air condition malfunctions in your home, you need to start with visible items and then move to hidden components. HVAC systems consist of an air conditioner and a fan connected to the ductwork. These elements are controlled by the thermostat which signals them to turn either on or off depending on the programmed settings. Being part of the ventilation system, the filter is positioned inside the cold air return which removes contaminants from air before cooled or heated air is distributed throughout your house. Here are tips on how to Diagnose Air and Heating Issues.


Diagnosis should begin by verifying if the HVAC system has been switched on. Find the service panel and make sure that the circuit breaker is position. The air conditioner and furnace have their own individual fuse or circuit breaker. If you notice that a unit has a problem, turn off its circuit breaker. Wait for 10 seconds and then switch it back on. In the event that you have fuses as a replacement for circuit breakers, switch off the main power. Remove the blown or burnt switch and replace it. The next step will be checking the thermostat for power. Most thermostats get power through electrical system whereas others have batteries. Remove the batters and replace with battery-powered thermostats if there’s no power at the unit.


Turn the thermostat to “heat” mode and then set it 3-5 degree above room temperature. Check for heat at an open register after 30 seconds. If you realize that no heat is coming out, turn off the thermostat. Check to see of the panel door of the furnace is closed. There is a switch inside the panel that allows the unit to function when it is engaged fully. If it is not engaged, the heater won’t start. Open the panel door and turn off the gas or push the reset button to reset the furnace. Wait for about five minutes then turn on the gas.

Air conditioner

Switch the thermostat to “cool” mode and then adjust its setting to 3-5 degrees below room temperature. Wait for 30 seconds and find an open register and also cool air. Go to the circuit breaker to reset the air conditioner. If the AC was operating but stopped to produce cold air, check the water below the system. If you see water, dirty coils can make the coils to free. Use the thermostat to switch off the air condition conditioner and allow the system to sit for about three hours before cleaning coils and restarting it. That’s how you Diagnose Air and Heating Issues.


Check the thermostat to ensure that the fan is on and the registers are also open. You can set the fan on the thermostat to either “on” or “auto”. Make sure that you check to filters to see if there are clogs. For the system to operate well, filters that return cold air must not have any dirt. If your filter is permanent, use the manual for directions on how to clean it. Check the arrow that shows the direction of air. The arrow should guide you on how you will reinstall the filter after cleaning it.