Arrived on site to see diagnose a no heating unit. Had another’s tech come out and checked everything and wanted to inspect b-vent on roof. He was unable to get get one the roof. Came out and inspect unit and found b-vent covered with soot. Found it not clogged up but dirty. Inspect heater and gas line. Asked client if she knew if she was on natural gas or propane and she stated she is on propane as this whole park is supplied propane. Found that unit did not have a propane kit installed. Due to that the unit may have ran for a short time but unit was not going to stay running properly due to fuel not burning properly. Advised office of findings and they are aware LP kit is missing. Advised client office will be ordering kit and will be getting warranty to come back out to replace igniter and install propane kit to unit. She is aware and okay with so. Office will call her once parts arrive to get her back on the schedule. She is aware and okay with so. Due to finding advise to not be