Arrive on 23 September for a furnace tuneup Blue Shield inspected evaporator inspected heat exchanger could not inspect the flu for his entirety due to the fact that there is no attic access change the filters Same goes with the return cannot inspect the return due to there is no attic access owned out the hot surface igniter it read 54 ohms removed cleaned and reinstalled the flame sensor checked flame sensor it had 3.6dc Milla amps check for carbon monoxide and always found during start up and do use motor had .2 A and in high mode it ran .5 A inspected blower blower is an ECM checked temperature rise it was 44 and the temperature rise range was 35 to 55. Check gas pressure check limits all with within standards.