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 Warm Welcome and arrange for a service call.
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.
Eternal Error Code E1
Remaining flame detected
Leave to a technician
- Call a technician
Eternal Error Code E2
Ignition failure - doesn't detect flame signal
Leave to a technician
- Check gas line, ignitor, flame rod
- Check wire connection of 8p wire and ignitor wire
- Check ignition noise
- Check gas type and manifold pressure
Eternal Error Code E3
Abnormal combustion - after detection of flame signal, system lose the signal
Leave to a technician
- 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
Eternal Error Code E4
An outlet thermistor open
Leave to a technician
- Check the outlet thermistor
- Check wire connection of 14p wire and thermistor wire
Eternal Error Code E5
An outlet thermistor short
Leave to a technician
- Check the outlet thermistor
- Check wire connection of 14p wire and thermistor wire
Eternal Error Code E6
A H/E thermistor open
Leave to a technician
- Check the H/E thermistor
- Check wire connection of 14p wire and thermistor wire
Eternal Error Code E7
A H/E thermistor short
Leave to a technician
- Check the H/E thermistor
- Check wire connection of 14p wire and thermistor wire
Eternal Error Code E8
An inlet thermistor open
Leave to a technician
- Check the inlet thermistor
- Check wire connection of 14p wire and thermistor wire
Eternal Error Code E9
An inlet thermistor short
Leave to a technician
- Check the inlet thermistor
- Check wire connection of 14p wire and thermistor wire
Eternal Error Code E11
A DC motor failure
Leave to a technician
- Check DC motor
- Check wire connection of 6p wire
Eternal Error Code E13
No filled water in tank or pressure switch failure
Leave to a technician
- Check the water filled in tank
- Check water pressure switch
- Check connection of 14p wire and water pressure wire
Eternal Error Code E23
Adjust control valve is not connected
Leave to a technician
- Check the adjust control valve movement noise
- Check wire connection of 16p wire and adjust valve wire
Eternal Error Code E24
Mixing control valve is not connected
Leave to a technician
- Check the mixing control valve movement noise
- Check wire connection of 16p wire and mixing valve wire
Eternal Error Code E26
Adjust control valve initialization failure
Leave to a technician
- Check the adjust control valve movement noise
- Check wire connection of 16p wire and adjust valve wire
Eternal Error Code E27
Mixing control valve initialization failure
Leave to a technician
- Check the mixing control valve movement noise
- Check wire connection of 16p wire and mixing valve wire
Eternal Error Code E28
Power line of main gas valve is open
Leave to a technician
- 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
Eternal Error Code E30
Rotation of a DC fan is too high
Leave to a technician
- Call a technician
Eternal Error Code E31
Rotation of a DC fan is too low
Leave to a technician
- Call a technician
Eternal Error Code E36
A controller failure concerning gas valve
Leave to a technician
- Call a technician
Eternal Error Code E37
Communication failure with SUB CPU
Leave to a technician
- Call a technician
Eternal Error Code E38
Subsidiary RAM failure
Leave to a technician
- Call a technician
Eternal Error Code E39
A controller failure concerning Subsidiary flame signal
Leave to a technician
- Call a technician
Eternal Error Code E40
Main RAM failure
Leave to a technician
- Call a technician
Eternal Error Code E41
A controller failure concerning flame signal
Leave to a technician
- Call a technician
Eternal Error Code E42
Main ROM failure
Leave to a technician
- Call a technician
Eternal Error Code E43
Main MUX error
Leave to a technician
- Call a technician
Eternal Error Code E47
Intake Thermistor Short
Leave to a technician
- Check the intake thermistor
- Check wire connection of 14p wire and thermistor wire
Eternal Error Code E48
Intake Thermistor Short
Leave to a technician
- Check the intake thermistor
- Check wire connection of 14p wire and thermistor wire
Eternal Error Code E49
Intake Thermistor Detect Abnormal Situation
Leave to a technician
- Call a technician
Eternal Error Code E50
Room A Thermistor Short (only hydro heating)
Leave to a technician
- Check the room A thermistor
- Check wire connection of 12p wire and thermistor wire
Eternal Error Code E51
Room A Thermistor Short (only hydro heating)
Leave to a technician
- Check the room A thermistor
- Check wire connection of 12p wire and thermistor wire
Eternal Error Code E52
Room A Thermistor Short (only hydro heating)
Leave to a technician
- Check the room A thermistor
- Check wire connection of 12p wire and thermistor wire
Eternal Error Code E53
Room A Thermistor Short (only hydro heating)
Leave to a technician
- Check the room A thermistor
- Check wire connection of 12p wire and thermistor wire
Eternal Error Code E54
Current Leak on Gas Valve Power
Leave to a technician
- Check gas valve
- Check connection of gas valve wire
Eternal Error Code E56
Less than 0.3gpm of water flow at recirculation mode and hydro heating
Leave to a technician
- Check flow sensor
- Check recirculation pump and loop
- Check connection of 14p wire and flow sensor wire
Eternal Error Code E57
Pump is not connected
Leave to a technician
- Check wire connection of 8p wire and pump wire
- Check the pump
Eternal Error Code E58 / E59
No response from ICC module
Leave to a technician
- Call a technician
Eternal Error Code E93
Master can't have any data on CAN line
Leave to a technician
- Check connection of 3p wire and MCU wire
- Check connection of termination wire and resistor(120Ω)
Eternal Error Code E94
Sub can't have any signal from master
Leave to a technician
- Check connection of 3p wire and MCU wire
- Check connection of termination wire and resistor(120Ω)
Eternal Troubleshooting FAQ
Burner does not ignite when the hot water is opened.
- Make sure that the ON/OFF button on the front or remote controller has been turned ON.
- If the monitor on the front or remote controller is blank, make sure the power cord is plugged in and the 3A fuses on the main controller in the unit are good.
- Make sure water is flowing to the unit. The unit activates once the inlet water flow is over 0.5 gpm.
- Make sure the cold and hot water lines are not plumbed in the wrong locations.
- Make sure that the water lines are not frozen.
- Make sure that the cold water and gas supply lines are opened.
Water is not hot enough.
- Check the setting temperature on the unit is not too low.
- Make sure that the filter in the cold water supply line is not clogged with debris.
- Make sure that the gas supply type is correct.
- Check the supply and manifold gas pressures are in accordance with specifications.
- Make sure that the water flow sensor with three wires has been properly connected.
Water is too hot.
- Make sure that the setting temperature on the unit is not too hot.
- Make sure that the filter in the cold water supply line is not clogged with debris.
- Make sure that the gas supply type is correct.
Hot water temperature fluctuates at the opened tap.
- Make sure the filter in the cold water supply line is clean.
- Make sure that the gas supply type is correct.
- Check the supply gas pressure is sufficient.
Abnormal sounds come from unit during operation.
- A leak of combustion gas between sealed chamber and exhaust tube inside the unit.
- Improper venting termination, make sure that the venting termination complies with specifications.
- Make sure the supply gas pressure is sufficient. Insufficient gas pressure will cause unstable burner flame and noise.
The blower is still operating after the combustion stops.
- This is normal because the blower still keeps operating for 1 minute to exhaust the flue gas from the chamber once the combustion has stopped.
I can't change the setting temperature to above 140°F on the front controller.
- This is a safety device to prevent scalding. Hot water temperature over 125°F can cause severe burns instantly or death.
Eternal GU145(S) Parts List
- 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
Codes and checks are for general guidance. Gas, venting, and electrical work on a water heater should be done by a licensed plumber.