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| List of common fault codes of Tongyi air energy water heater | |||
| show code | Fault conditions | cause of issue | Method of exclusion |
| E01 | water temperature sensor failure |
Water temperature sensor open or short circuit | Check the water temperature sensor cable or replace the water temperature sensor |
| E02 | ambient temperature sensor failure |
Ambient temperature sensor is open or shorted | Check the ambient temperature sensor cable or replace the ambient temperature sensor |
| E03 | System 1 Coil Temperature sensor failure | Coil temperature sensor open or short circuit | Check coil temperature sensor wiring or replace the coil temperature sensor |
| E04 | Water flow switch protection Fault | Water flow switch disconnected water line clogged Water pump does not start Insufficient water flow |
Check or replace the water flow switch Cleaning water pipes and filters Check or replace high flow water pump |
| E05 | System 1 high voltage protection fault | High voltage protection disconnected Insufficient water flow |
Cleaning water pipes and filters Check or replace the high voltage protector |
| E06 | System 1 low voltage protection fault | Low voltage protection disconnected Insufficient refrigerant in the system |
Supplementary refrigerant Check or replace the low voltage protector |
| E07 | Outlet temperature sensor failure |
The outlet water temperature sensor is open or shorted | Check the connection wire of the outlet water temperature sensor Or replace the outlet water temperature sensor |
| E08 | water level Water shortage protection fault |
Water tank shortage water level line break |
Check or clean water supply pipes and water supply valves Check water level and reposition |
| E09 | Insufficient water flow Temperature difference protection fault |
The temperature difference between inlet and outlet is too large Insufficient water flow |
Cleaning water pipes and filters Check or replace high flow water pump |
| E10 | Operation communication failure | Poor contact or open circuit of the operation panel connection line | Check the operation panel connection Replacing the operation panel or main board |
| E11 | System 2 Coil Temperature sensor failure |
Coil temperature sensor open or short circuit | Check coil temperature sensor wiring or replace the coil temperature sensor |
| E12 | System 2 high voltage protection fault | High voltage protection disconnected Insufficient water flow |
Cleaning water pipes and filters Check or replace the high voltage protector |
| E13 | System 2 low voltage protection fault | Low voltage protection disconnected Insufficient refrigerant in the system |
Supplementary refrigerant Check or replace the low voltage protector |
| E14 | System 1 exhaust high temperature protection fault | Exhaust temperature is too high Insufficient refrigerant |
Replenish refrigerant or adjust throttle valve Replacing the Press Lubricant |
| E15 | System 2 exhaust high temperature protection fault | Exhaust temperature is too high Insufficient refrigerant |
Replenish refrigerant or adjust throttle valve Replacing the Press Lubricant |
| E16 | System 1 Exhaust Temperature sensor failure |
Exhaust temperature sensor open or short circuit | Check exhaust temperature sensor wiring or replace the exhaust temperature sensor |
| E17 | System 2 Exhaust Temperature sensor failure |
Exhaust temperature sensor open or short circuit | Check exhaust temperature sensor wiring or replace the exhaust temperature sensor |
| E18 | Water high temperature protection fault | The outlet water temperature of the direct heat circulating unit is too high | Increase the inlet water flow or replace the inlet water pump Supplementary refrigerant |
| E19 | System 1 return air temperature sensor failure |
Return air temperature sensor open or short circuit | Check exhaust temperature sensor wiring or replace the exhaust temperature sensor |
| E20 | System 2 return air temperature | Return air temperature sensor open or short circuit | Check exhaust temperature sensor wiring or replace the exhaust temperature sensor |
