TROUBLESHOOTING
PROBLEM ISSUE POSSIBLE CAUSE SOLUTION
Display E1 / E0
Display E2 / E3
Display LL
Inlet temperature sensor failure.
Inlet temperature lower than 37°F (3℃)
Unit does not work when the inlet temperature is
lower than 37°F (3℃).
Display HH
Outlet temperature higher than 167°F
(75℃)
Unit does not work when the outlet temperature
is higher than 167°F (75℃).
Display E4 The inlet and outlet pipes are reversed. Please check if the the inlet and outlet pipes are
reversed. If reversed turn off the unit and
reconnect the inlet and outlet pipes.
Display LF
Contact local dealer.
Contact local dealer.
1. Make sure that the main circuit breakers that
supply the water heater is on.
2. The unit may have a wiring error.
3. There may is a problem with the circuit breaker.
4. Contact local dealer.
Outlet temperature sensor failure.
1. Turn up the setting temperature.
2. Reduce water flow.
3. If the first installation is complete, please let
the electrician check the wiring carefully. The
wiring may be incorrect.
If not, contact local dealer.
4. Check the power supply.
5. Replace temperature sensor.
6. Replace the heating element.
Water leakage at the inlet
and outlet connector.
1. The connector is not installed in place.
2. Seal damage.
1. Tighten the connector.
2. Replace the seal.
The unit does not work
(Power indicator is NOT on)
Incorrect power wiring connection or
no power.
Water heater is not heating
at all (Power indicator is on)
Water heater is working but
the outlet temperature is not
hot well.
1. Low Setting temperature
2. Excessive water flow
3. Faulty wiring
4. Voltage too low.
5. Temperature sensor failure.
6. Heating element damaged.
1. Turn down the setting temperature
2. Increase water flow
3. Cut off the power and contact local dealer.
Water heater is heating but
the outlet temperature is too
hot.
1. Temperature set too high.
2. Low water flow
3. PCB failure
Clean them
The outlet flow is reduced.
Inlet filter, shower or faucet clogged.
1. No water flow.
2. The flow is too small to start the unit.
3. Control board failure.
The flow of inlet too small to start the unit.
1a. Check the water supply channel;
1b. Clean filter at unit;
1c. Clean faucet aerator or shower head.
2. Increase water flow.
3. Cut off the power and contact local dealer.
Increase the inlet pipe flow.
MAINTENANCE INSTRUCTIONS
If you have any trouble about installation or usage, please email us or visit our website
Domccy@yahoo.com
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