Trane XR95: Won't fire up

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grltnr

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Oct 4, 2015
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I've been having a problem lately with my 3 year old furnace.


The furnace fires up when I disconnect the tube from the pressure switch, however it hesitates when igniting.

see video.
[ame]https://www.youtube.com/watch?v=OzMgYRzKbN4[/ame]

When I plug in the tube back into the pressure switch, I get the 3 blinking lights on the main board.
 
Hot surface ignition ? What proves the pilot ? A thermocouple ? An optical sensor ? An electrical / electronic temperature sensor ?

God bless
Wyr
 
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