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Old 04-20-2020, 04:58 PM   #1
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Lockouts


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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Old 04-20-2020, 05:18 PM   #2
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Re: Lockouts


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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Old 04-20-2020, 05:20 PM   #3
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Re: Lockouts


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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I am not in the business of any trade I give advice on. I have non-professional hvac experience + good knowledge of theory. Attempt repairs at your own risk. Never jump out safeties - especially pressure switches - on a furnace for testing with fuel supply on; use a meter. Do not troubleshoot with live line voltage present unless there's no alternative.
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