Arrived on 13 October for a full tuneup supper club change filters customer provided change battery in the thermostat measured flame sensor in a 2.3 mill volts DC check gas pressure is at 3.478 checked temperature rise it was 42° and manufacture specifications states in between 30 and 60 check flu this is a 90% furnace check drain to ensure proper flow checked all circuitry to ensure everything is in good working order.