State customer service: 1-800-365-0024. Hours: Monday-Friday, 7 AM - 7 PM Central. Operates under AO Smith corporate but maintains State-specific support staff. Hold times typically 10-20 minutes.
What to have ready
- Model number from data plate
- Serial number
- LED flash code (gas units) or symptom summary
- Install date if you have records
- For Premier Hybrid: alphanumeric display code if shown
What State support can do
- Walk through LED flash code diagnostics
- Confirm warranty by serial number
- Dispatch parts to a State-authorized installer via AO Smith distribution
- Locate the nearest State-authorized installer
- Email manuals and parts diagrams
- For Premier Hybrid: escalate complex compressor/sensor faults to AO Smith heat pump engineering
What they won't do
- Ship parts directly to homeowners
- Dispatch a technician (installer's job)
- Help with hydronic system design (State doesn't make combi boilers)
AO Smith corporate handling
Although you reach State support at the State number, the back-end is AO Smith corporate. Parts orders flow through AO Smith distribution (Ferguson, Hajoca, Winsupply). Warranty claims are processed by AO Smith. The branding-vs-handling distinction matters mostly when escalating complex issues — engineering escalation goes through AO Smith.
Bottom line
Have your model and serial number ready. State support is competent and can resolve most issues over the phone. For Premier Hybrid, expect a more detailed conversation than a basic tank water heater.