View visual findings from this job here - https://visionshare.xoi.io/?id=XA-15F7-537FD51400A94D18A9EAE7C801F924B5 Customer has no heat in home from Trane Gas fired furnace: * At arrival system is calling for heat, but the furnace is off and the blower is on and running * The furnace control board is showing an error code of four flashes indicating an open limit switch * Found that the rollout limit switch On the right hand Side by the burners was tripped * Reset the Switch in system is back up and running * The air filter is completely plugged- Replace replaced with brand new provide provided by customer * I noticed that the flames were uneven when the system was on and running * I performed multiple test on the heat exchanger testing with the fan on and running and performing a powder cloud test and also checking the heat exchanger with the manometer with the fan on and running- The heat exchanger is good * I then check the incoming and outgoing gas pressure on the system- also good