I arrived and checked in. Once I was on-site I contacted Stan and we had a quick discussion about the unit, what had happened previously and what was occurring today. I accessed the roof and the unit was in heat mode but there were no flames and the inducer motor was running. I checked the voltage from the thermostat and confirmed that the thermostat was sending the right voltage for operation then set my voltmeter up on the gas valve before resetting the unit. It followed it’s ignition sequence and the gas valve was receiving proper voltage (was not on previous visit) and opening the pilot valve. The unit did not light. I called Stan and was given verbal permission to drop the gas valve and manifold to deep clean around the spark igniter and observe the quality of the spark. The spark was solid and the cleaning was successful. The unit lit properly. The unit was cycled 15 times with five of those being from the thermostat inside the business and 10 of those being from