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Error code 91.03 on a trane tzone 950ac52za - Heating & Cooling

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Turn breaker off to air handler for 10 seconds, then back on. Give time to initialize and see if error clears. If not go into technician access to diagnostics. I believe in there you will find summary table. SUMMARY TABLE is what you need. Whatever is "offline" is the problem. Delete that item and go from there.

Posted on Dec 21, 2016

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Posted on Jan 02, 2017

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