Model reference
A.O. Smith T-K3
Water Heater
1 document20 error codes3 service modes
Available documentation
Service Manual
- Troubleshooting Guide - 710 / 710 ASME On-Demand Water Heater33 pg
MyPros+ Max
Diagnose your A.O. Smith T-K3.
- Step-by-step diagnostics from the service manual
- Test values, resistance specs, and wiring references
- Verified part numbers when replacement is needed
Start diagnosing
$29/month · Cancel anytime · Or $9.95 3-day pass
Error codes (20)
CodeMeaning
031Incorrect dipswitch settings on the computer board.101Abnormal combustion detected by the air-fuel ratio detection system.111Ignition failure121Flame loss311Output thermistor fault.321Inlet thermistor fault.331Mixing thermistor fault.391Air-fuel ratio rod failure.441Flow sensor fault in Easy-Link multi-unit system510Abnormal main gas valve551Abnormal solenoid gas valves611Abnormal fan motor.631Pump failure.651Abnormal flow adjustment valve (Easy-Link multi-unit system only).661Bypass valve fault.701Computer board fault.721False flame detection741Remote controller communication failure761Communication failure in a multiple heater Easy-Link setup991Abnormal combustionService modes (3)
- Computer Board Reset["Verify no water is flowing through the unit.","If a temperature remote controller is installed…
- Diagnostics Mode (Remote Controller)["Enter Diagnostics Mode on the TM-RE10 or TM-RE30 remote controller (refer to Maintenance Sheet…
- MAX/MIN Combustion Test Mode["Connect a manometer to the manifold port.","Run water through the unit to activate operation…
Full entry steps, exit procedures, and test sequences are available in Max.
Related A.O. Smith water heater models
78,000+ service manuals · 160,000+ error codes · 55+ brands
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass