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what is an error code of E4 on york a/c unit?

what is an error code of E4 on york a/c unit?
Vinod Rao, April 2010
Reset problem solve

Pandu, August 2020
Temperature not cool down after 15 minutes of working. Check sensor temperature, check if sensor still welded on pipe, check if contact with control panel is OK

Cool guy, April 2014