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I have a trance xl 90 furnace. I keep getting lockouts. I replaced my igniter and flame sensor. I get flame on the first of three jets and she shuts down before it reaches the flame sensor on the 3rd jet
 

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Please stop replacing random parts. Doing so will not fix your problem.
Diagnose first.
Remove and clean the burners. Check the gas pressure.
 

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probably a gas pressure issue or dirty burner crossover tubes.

best to call for service unless you know how to work with gas - may have to remove manifold to be able to pull the burners.

don't buy any more parts.
 
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