18
19
WARNING: Corrections to problems 8, 9 and 10 should only be performed by qualified electrician. The person who
initially installed the unit is the best one to contact for help, or contact Marey for service.
NORMAL MAINTENANCE
Note: Do not attempt to repair this water heater yourself. Call a service person for
assistance. Always turn off the breaker before working on the unit.
To ensure consistent water flow, the following is recommended:
1. Periodically remove build-up and dirt that may accumulate at the aerator of the faucet or in
the shower head.
2. Periodically clean the built-in filter screen at the inlet connection on the water heater.
Water faucet must be turned off before cleaning the screen.
1. Inlet and outlet
fittings leaking
A. Fittings not tight
B. Rubber washer worn-out
A. Tighten fittings.
B. Change rubber washer.
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 out from shower.
B. Water pressure too low.
C. Key or PCB damaged.
A. Open valve to get water.
B. Open valve to get pressure.
C. Change key or PCB.
A. Too high temperature set.
B. Water flow too small.
A. Set a lower temperature.
B. Open valve bigger.
A. Low temperature set.
B. Water flow too much.
A. Set a higher temperature.
B. Reduce water flow.
6. Outlet gets water
smaller and smaller.
Inlet strainer or shower clogged.
Clean strainer and shower.
Outlet temperature is over
67ºF/153ºF.
A. Reduce the temperature.
B. Turn up the water flow.
Temperature sensor failure.
Please contact with the local dealer.
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 0.7Mpa.
A. Clean shower set.
B. Reduce water pressure.
Inlet water flow is too big.
Reduce the inlet water flow.
REMARK: R:HEATING SYSTEM T:TRIACL: LINE
L1
L1'
L1"
T1
T2
T3
R1
R2
R3
L2"
E
THERMAL CUT-OUT 90¡æ
CONTROL
SYSTEM
DISPLAY
SCREEN
INLET TEMP.SENSOR
FLOWMETER
OUTLET TEMP.SENSOR
L2
L2'
REMARK: R:HEATING SYSTEM T:TRIACL: LINE
L1
L1'
T1
T2
R1
R2
L2
E
THERMAL CUT-OUT 90¡æ
CONTROL
SYSTEM
DISPLAY
SCREEN
INLET TEMP.SENSOR
FLOWMETER
OUTLET TEMP.SENSOR
L2'
Fig. 17
Fig. 18
(7 pages)
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