Auxillary heat runs after thermostat is satisfied

by Monte

In have a Lennox heat pump with an electric unit ECB29EH-12.5CB-I-P. Ocassionally when the compressor stops the auxiliary heat and fan continue to run util I hit the circuit breaker. The aux heat then turns off and after a while the fan shuts off also. After these have shut down the W2 indictor light stays illuminated. The unit has 3 sequencers, one was changed by a tech 2 years ago and I changed all three today. This doesn't happen every time the unit operates, but the W2 stays lit at all times. Any ideas?

Thanks in advance for your help.

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