Before calling service technician:
Click following link, the click product, then scroll to page bottom to tab that offers technical literature, and download service manual and operation manual.
http://www.hotwater.com/water-heaters/residential/hybrid/Read the required installation and maintenance protocol to see if air filter has been cleaned regularly, or the condenser coil might be dirty.
Required maintenance can be done by service tech recommended by AO Smith.
Contact AO Smith to find trained person, and next time, do not install expensive water heater since all savings disappear with service issues.
Gene
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If you need further help, I’m available over the phone at
https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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