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About kdgrayson@gmail.com
Expertise
Any residential, light commercial (5ton&less)Heating Air conditioning Refrigeration, heat pumps, water heaters, basic electrical.
I am not familiar with pneumatics, compressors over 5 ton, little 3 phase experience.
Experience
34 years in the electromechanical fields
Education/Credentials
Associates Mechanical Electrical Theory Sac city
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You are here: Experts > Home/Garden > Home Appliances > Heating, Air Conditioning, Fridge, HVAC > Trane XE80 won't fire up
Expert: kdgrayson@gmail.com - 11/7/2009
Question
I'm helping a friend with her Trane XE80 furnace. It displays a 9 flash error code which indicates it should be the igniter. I changed the igniter as it was obviously burnt off and was shocked when it still did not fire up. I still get the same error code and have done voltage checks and ground checks. Everything seems okay there. The one thing I did notice is that when it tries to fire up the purge fan only runs for a second or two and a voltage check on the igniter terminals indicates a very short surge of power then goes dead again. I think it must be the purge fan/combustion box low air safety switch. We are in Saskatchewan with daytime temperatures hovering around the 40's F and nights into the high 20's F. Thanks for any ideas.
Answer
Assuming all safeties are closed , with voltage applied there will be an amp draw , if its trying to work, or shorted to itself or ground, if no amp draw the circuits open due to a open circuit , as incracked ignitor or open wiring etc, with ignitors they break easily, if you have apropriate voltage and no amp draw its bad, and likely will ohm out as open , without continuity
the ignition module sounds bad, theres a pressure swith too that can be not opening or wavering , little arm behind pressure swith can be bent , tube to induced draft housing to presure switch can leak, or fill with condensate, or orifices clogged where hose attaches, clean with paper clip it gets carboned up
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