Eternal Water Heater Error Codes
In 2014 increasing problems with the Eternal heat exchanger and controls resulted in leaks and premature system failures. After a year of trying to correct the problems, Grand Hall, the parent company of Eternal Water Heaters, ceased operations in North America leaving their customers without warranty coverage, part replacements and technical resources.
You may be able to clear the Error Message simply by turning the hot water tap OFF, then ON again. If this does not clear the Error Message, try pushing the ON/OFF button OFF, then ON again. If the Error Message still remains, contact Hot Water Now! and arrange for a service call.
Eternal Water Heater Repair
In some cases, we have the parts to make successful repairs. We are generally able to service and repair units that are not working properly, or are displaying an error code. Once the units develop a leak it’s time to consider replacing the system.
Self Monitoring
To assist with diagnosing an error, Eternal tankless water heaters have the ability to check their own operation continuously. If an error occurs, a message will flash on the digital monitor of the front panel. Please refer to the error code when scheduling service.
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Eternal Water Heater Error Codes
In 2014 increasing problems with the Eternal heat exchanger and controls resulted in leaks and premature system failures. After a year of trying to correct the problems, Grand Hall, the parent company of Eternal Water Heaters, ceased operations in North America leaving their customers without warranty coverage, part replacements and technical resources.
You may be able to clear the Error Message simply by turning the hot water tap OFF, then ON again. If this does not clear the Error Message, try pushing the ON/OFF button OFF, then ON again. If the Error Message still remains, contact Hot Water Now! and arrange for a service call.
| Code Display | Cause | Remedy |
|---|---|---|
| E1 | Remaining flame detected | Call Hot Water Now! (720) 934-8711 |
| E2 | Ignition failure - doesn't detect flame signal | Check gas line, ignitor, flame rod Check wire connection of 8p wire and ignitor wire Check ignition noise Check gas type and manifold pressure |
| E3 | Abnormal combustion - after detection of flame signal, system lose the signal | Check the gas supply in enough Check the gas valve Check wire connection of 8p wire and ignitor wire Check gas type and pressure are correct Check power supply for proper voltage |
| E4 | An outlet thermistor open | Check the outlet thermistor Check wire connection of 14p wire and thermistor wire |
| E5 | An outlet thermistor short | Check the outlet thermistor Check wire connection of 14p wire and thermistor wire |
| E6 | A H/E thermistor open | Check the H/E thermistor Check wire connection of 14p wire and thermistor wire |
| E7 | A H/E thermistor short | Check the H/E thermistor Check wire connection of 14p wire and thermistor wire |
| E8 | An inlet thermistor open | Check the inlet thermistor Check wire connection of 14p wire and thermistor wire |
| E9 | An inlet thermistor short | Check the inlet thermistor Check wire connection of 14p wire and thermistor wire |
| E11 | A DC motor failure | Check DC motor Check wire connection of 6p wire |
| E13 | No filled water in tank or pressure switch failure | Check the water filled in tank Check water pressure switch Check connection of 14p wire and water pressure wire |
| E23 | Adjust control valve is not connected | Check the adjust control valve movement noise Check wire connection of 16p wire and adjust valve wire |
| E24 | Mixing control valve is not connected | Check the mixing control valve movement noise Check wire connection of 16p wire and mixing valve wire |
| E26 | Adjust control valve initialization failure | Check the adjust control valve movement noise Check wire connection of 16p wire and adjust valve wire |
| E27 | Mixing control valve initialization failure | Check the mixing control valve movement noise Check wire connection of 16p wire and mixing valve wire |
| E28 | Power line of main gas valve is open | Check the thermostat Check the thermal fuse Check the air pressure switch Check wire connection of gas valve, thermostat, thermal fuse and air pressure switch |
| E30 | Rotation of a DC fan is too high | Call Hot Water Now! (720) 934-8711 |
| E31 | Rotation of a DC fan is too low | Call Hot Water Now! (720) 934-8711 |
| E36 | A controller failure concerning gas valve | Call Hot Water Now! (720) 934-8711 |
| E37 | Communication failure with SUB CPU | Call Hot Water Now! (720) 934-8711 |
| E38 | Subsidiary RAM failure | Call Hot Water Now! (720) 934-8711 |
| E39 | A controller failure concerning Subsidiary flame signal | Call Hot Water Now! (720) 934-8711 |
| E40 | Main RAM failure | Call Hot Water Now! (720) 934-8711 |
| E41 | A controller failure concerning flame signal | Call Hot Water Now! (720) 934-8711 |
| E42 | Main ROM failure | Call Hot Water Now! (720) 934-8711 |
| E43 | Main MUX error | Call Hot Water Now! (720) 934-8711 |
| E47 | Intake Thermistor Short | Check the intake thermistor Check wire connection of 14p wire and thermistor wire |
| E48 | Intake Thermistor Short | Check the intake thermistor Check wire connection of 14p wire and thermistor wire |
| E49 | Intake Thermistor Detect Abnormal Situation | Call Hot Water Now! (720) 934-8711 |
| E50 | Room A Thermistor Short (only hydro heating) | Check the room A thermistor Check wire connection of 12p wire and thermistor wire |
| E51 | Room A Thermistor Short (only hydro heating) | Check the room A thermistor Check wire connection of 12p wire and thermistor wire |
| E52 | Room A Thermistor Short (only hydro heating) | Check the room A thermistor Check wire connection of 12p wire and thermistor wire |
| E53 | Room A Thermistor Short (only hydro heating) | Check the room A thermistor Check wire connection of 12p wire and thermistor wire |
| E54 | Current Leak on Gas Valve Power | Check gas valve Check connection of gas valve wire |
| E56 | Less than 0.3gpm of water flow at recirculation mode and hydro heating | Check flow sensor Check recirculation pump and loop Check connection of 14p wire and flow sensor wire |
| E57 | Pump is not connected | Check wire connection of 8p wire and pump wire Check the pump |
| E58 / E59 | No response from ICC module | Call Hot Water Now! (720) 934-8711 |
| E93 | Master can't have any data on CAN line | Check connection of 3p wire and MCU wire Check connection of termination wire and resistor(120Ω) |
| E94 | Sub can't have any signal from master | Check connection of 3p wire and MCU wire Check connection of termination wire and resistor(120Ω) |
Parts List for Model GU145(S)
KEY DESCRIPTION
- 1. Panel, Front Assembly
- 2. Panel, Top / Rear Assembly
- 3. Panel, Rear
- 4. Panel, Left Assembly
- 5. Panel, Right Assembly (GU145(S))
- 6. Panel, Bottom
- 7. Mounting Bracket
- 8. Wall Bracket
- 9. Controller / Front
- 10. T&P Relief Valve (Cash Acme)
- 11. Vent Collar
- 12. Vent Collar Packing
- 13. Rubber Foot
- 14. Drain Valve Assembly
- 15. Main Power Cord
- 16. Handle
- 17. Condensing Nipple
- 18. Mesh Screen
- 19. Outdoor Venting Cap (Optional)
- 20. Trap Cleaner Assembly
- 21. Radial Blower Assembly
- 22. Gas Valve
- 23. Air Pressure Switch (GU145(S))
- 24. Burner Assembly
- 25. Main Controller (GU145(S))
- 26. Cold Water Tube Assembly (GU145(S))
- 27. Hot Water Tube Assembly (GU145(S))
- 28. Flexible Silencer Kit
- 29. Mixing Valve
- 30. EC Adapter
- 31. Water Pressure Switch
Eternal FAQ's
Eternal Water Heater Frequently Asked Service and Repair Questions