What does error code 14 mean on a Bryant 90 plus?

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Hello, I have a 15 year old Bryant 90 Plus furnace and I keep getting error code 14, which says it is “ignition lockout”. In the manual after reading error code 14, it says to refer to code 34, which is “ignition proving failure”. I’ve cleaned the heat sensor and had a hvac technician look at it and he flushed the heat exchanger.

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