How to Troubleshoot Gas Garage Heaters

Check to see if a fuse has blown and if the main power is on if the heater isn’t working at all. Ensure that the gas supply is turned on at the meter.

Check the thermostat to ensure it’s set at the correct temperature and the control switch to ensure it’s working if you aren’t getting enough heat. Call a technician to have either replaced if they are broken.

Open up the main gas valve to the heater and purge air from the gas line if the heater will start but doesn’t ignite. Turn the unit on and off a few times to get air out of the line.

Set the gas pressure to the proper setting according to your specific model, and check to ensure the gas valve is set to “On” if you aren’t getting ignition.

Remove any obstructions from in front of the vents, and reconnect the motor hose if it has come off if the warm air isn’t being distributed properly.

Check for any loose connections around the air circulation fan if it isn’t working properly. Switch off the fan time-delay relay switch if your unit has one.