Troubleshooting 117
5.1.26 740Error
Error occurrence conditions and check items
Error Description
E740
Abnormal outdoor
sensor
If an error (under 2.2k or over 122.2k) in the outdoor sensor is detected continuously for 3 seconds, The
system displays the error message E740 on the front panel. If this occurs, the water heater changes the control
mode from Reset Curve Mode to Normal Mode.
Check items
1. Check if the outdoor sensor connector is wet due to any reason, including leakage.
2. Check the Resistance of the outdoor sensor.
3. Check the parameter setting. (refer to page 155)
4. Replace the defected Hot water outlet temperature sensor.
5. Replace the controller.
5.1.27 760Error
Error occurrence conditions and check items
Error Description
E760
Flushing Alram
If the water heater operate more than set flushing time(day), The system displays the error message E760 on the
front panel. If this occurs, the water heater operate with Normal Mode.
Check items
1. Check the water heate and flushing the water heate, if it is required.
2. Reset the timer with reset button on the front panel.
5.1.28 785Error
Error occurrence conditions and check items
Error Description
E785
Abnormal External Flow
Switch
If an AHU heating is OFF and Flow Rate is O and Flow Switch is detected continuously for 3 seconds, The system
displays the error message E785. If this occurs, the water heater operate AHU heating Mode and operate DHW
mode when the water heater detect saved flowrate plus 0.4gpm(1.5 lpm) more.
Check items
1. Check if the Flow Switch is ON or OFF.
2. Check the Resistance of the terminal block.
3. Replace the controller.
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