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Problems
Possible Causes
Corrective Actions
1. Inlet and outlet
fittings leaking
A. Fittings not tight
B. Rubber washer worn-out
A. Tighten fittings.
B. Change rubber washer.
2. Blank screen A. Power not connected.
B. LCD damaged.
C. LCD not connected to PCB.
A. Connect power to the unit.
B. Change LCD.
C. Connect LCD to the PCB Board.
3. Functional keys not
working
A. No water output.
B. Water flow is too low.
C. Key or PCB damaged.
A. Check water supply valves.
B. Open valve to increase flow.
C. Change key or PCB.
4. Water too hot A. Temperature setpoint too high.
B. Water flow is too low.
A. Set a lower temperature.
B. Open valve to increase water flow.
5. Water too cold A. Low temperature set.
B. Too much waer flow.
A. Set a higher temperature.
B. Reduce water flow.
6. Outlet flow noticeably
decreases
Inlet strainer or shower clogged. Clean strainer and shower.
7. LED displays E1 Outlet temperature is over
67 deg «C» /153ºF.
A. Reduce the temperature.
B. Turn up the water flow.
8. LED displays E3
Temperature sensor failure. Please contact with the local dealer.
9. LED displays E4 Dry Heating. Shut off. Clean all outlets from any
debris, dirt, any particle or scale inside
the pipe.
10. Pressure relief
valve releases water
A. Outlet blocked.
B. Inlet pressure over 100psi or 0.7Mpa.
A. Clean shower set.
B. Reduce water pressure.
11. Display overflow Inlet water flow is too high. Reduce the inlet water flow.
WARNING: Corrections to problems 8, 9 and 10 should only be performed by
qualified electrician or plumber. The person who initially installed the unit is the best
one to contact for help, or contact Marey for service.
2. Turn on the circuit breakers to provide power to the unit.
3. Press the center button to turn on the heater. NOTE it will not start heating until
water is provided to the unit.
If there is power to the unit, but no digital display, turn off the circuit breaker. Double
check to make sure that the cable to the LCD panel on the front cover is correctly
connected inside the unit, then turn the breaker back on.
4. After the unit is supplied with power, a beep sound can be heard and the display
flashes the set temperature, then goes solid showing the actual output temperature
for 30 seconds until the screen goes blank. the unit is now in standby mode .
5. Press the power button to activate/ deactivate the unit. When the unit is ON, the
LED display shows the actual water temperature of the outlet water.
6. The outlet water temperature can be adjusted by changing the temperature
settings on the heater. Press and to adjust the temperature. The range of
options for the temperature setting is 30ºC-52ºC/86ºF-125ºF.
WARNING: If the unit has been used recently, you may initially get a short burst of
very hot water from the unit. Allow a few seconds for the water to cool down to the set
point. Test the water before you take a shower. If the unit will not be used during
winter, drain out any water completely so that the heater will not freeze.
Periodically clean the inlet filter screen and the shower head to maintain strong
water flow.
7. Press then press to convert the temperature display between Fahrenheit
and Celsius.
8. The unit features an automatic memory function to avoid repetitive operation.
When you turn on the water heater, the default set point will be the same as the last
setting used.
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