Arrived at location on 2/11/22 - Checked over unit, found burner flame is decent, flame is blue with a few orange tips once in a while, set thermostat to 350F, when heat indicator went out the temperature was only 226F, set thermostat to 500F, only came up to 346F, thermostat has failed and will need to be replaced. Returned to location on 2/22/22 - Removed side panel, removed failed thermostat, installed new thermostat, turned on unit, set to 350F, heated up to set point, temperature is within range, closed up unit, confirmed unit working correctly at this time.