Basement furnace/ heat pump started unit is emergency heat to test furnace because they where having problems with it not staying running deamed it to the flame sensor it would start one time then it would go right back off every few try’s from it not sensing flames, Inspected evap coil no access due to the flue is tight up agents the coil door no room to get door off took camera and to be able to see if the coil is dirty it was not it was cleaning at this time, inspected blower wheel very thin layer of dust on the wheel it is working fine at this time, inspected heat exchanger very little rust no holes are cracks found, inspected burners all clean free of rust in good working order, inspected flame sensor pulled and it was very dirty cleaned off installed back, inspected all electrical wiring and connections none found burned are broken at this time, inspected condensation drains on 90% furnace blow out and tested all working good at this time, inspected blower amps 4.5 in rang