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WATER HEATER

EWH-10 Electric Wall Hung Water Heater

EWH-10 Electric Wall Hung Water Heater

8

EWH

......

Troubleshooting

Problem

Possible Cause

Solution

High Limit: 

    1)unplug  the  water  heater      2)remove  the  plastic  front  cover      3)disconnect  the  wiring

terminal   4)take off the high limit   5)install new replacement by reverse sequence.

Maintenance:

              ●

  When  necessary  to  completely  drain  the  heater,  close  inlet  valve,then  open  outlet  valve  (faucet),

         lift safety valve lever, water flows out of the discharge line.

       ● 

Clean water tank periodically to remove scale.   1)shut off power   2)remove safety valve and inlet tube

        3)connect the water heater outlet with supply piping(tap water);connect the heater inlet to floor drain    
        4)turn on the inlet valve fully to have the supplying(tap)water flush the tank,until the water runs clear      
         5)re- connect piping per figure6.
Warning∶ the discharged water may be hot,be cautious to prevent scalding injury.

Indication Light off 

No hot water

Indication Light off 

Water temperature too high

Indication Light on

No hot water

Water too hot

Piping connection leaks

Cover leaks

1)Heater is no plugged
2)No power in the wall socket 
3)Control circuit or internal wiring error

1)High-limit activated
2)Thermostat faulty

Heating element(s) burnt
or internal wiring error

Thermostat set too high

Connection not sealed

Thank or parts leak

Contact customer service

Turn down adjusting knob

Re-connect piping,
must use thread sealant

Shut off power immediately
contact customer service

1)Contact customer service
2)Contact customer service

1)Plug the heater
2)Check the socket
3)Contact customer service

Summary of Contents for EWH-10A2

Page 1: ...EWH 10A2 10B2ElectricWallHungWaterHeater WATER HEATER A O SMITH WATER PRODUCTS COMPANY INSTALLATION OPERATION MANUAL ...

Page 2: ... features that only a company with over sixty years of experience can deliver With the proper care your heater will deliver comfortable hot water for years to come We are concerned about your safety and ask you to read this manual thoroughly and pay close attention to all of the warning and information contained inside Be sure to keep these instructions for future reference Thank you for buying an...

Page 3: ... Temperature Limit Control High Limit 3 Safety Valve 3 Product Features 4 Thermostat 4 Glass lined Tank 4 Thermal Insulation Layer 4 Anode Rod 4 Installation Instruction 4 Installation procedure 5 Water Connection 6 Power Connection 6 Filling 6 Operation Instruction 7 Setting up Temperature 7 Operating 7 Note 7 Repair and Maintenance 7 Replacing Parts 7 Maintenance 8 Troubleshooting 8 Wiring Diagr...

Page 4: ... installation of this water heater Only professionals recognized by A O Smith are allowed to install this water heater for you Read this manual thoroughly before installation and use Failure to comply with these instructions may cause serious harm and or property loss Hot water may cause serious scalding injury Hot water must be mixed with cold water before shower and washing If the power cord is ...

Page 5: ...sure relief Safety Valve This appliance has a pressure relief valve see figure 6 It must be installed in the inlet piping blue It has been factory set at 0 8 MPa and is nonadjustable This Valve relieves and discharges when the actual pressure in the piping exceeds this set rate The discharge outlet of this valve must face downward and the discharged water must be piped into or within15 cm above a ...

Page 6: ...coating is then fused to the steel at 850 forming a durable impact resistant lining Further this glass lined tank has passed the100Κ times cycle test per UL Underwriter Laboratories standard Water heater life is greatly prolonged as a result of its antirust and anti scale feature Thermal Insulation Layer This extra thick insulation layer keeps temperature well and reduce heat loss maximally Anode ...

Page 7: ... Make sure that the wall can withstand four times weight of fully filled water heater To locate the fixing bolts make sure the heater front has adequate c1earance to facilitate opening up the plastic front cover for servicing or resetting the high limit when necessary Use 10mm drill bit to drill 2 holes of at least 70mm depth in wall The 2 holes should be in line horizontally See figure 3 for dist...

Page 8: ...sure suitable pipe thread sealant is used for all connections to prevent leakage In case that the supplying water pressure is close to the safety valve rating install a pressure reducing valve in inlet piping with sufficient distance away from the heater See figure 6 for water connection details EIectrical wiring This water heater has power wire and plug and readily connected Just plug it into an ...

Page 9: ... outlet Under normal use the safety valve lever should be opened periodically If water flows then the relief valve is in good working condition if no water flows then contact local customer service Operating Instructions Repair and Maintenance Replacing Parts Heating element and anode rod 1 unplug the water heater 2 close off the inlet valve 3 open up the safety valve lever near the water inlet 4 ...

Page 10: ...turn on the inlet valve fully to have the supplying tap water flush the tank until the water runs clear 5 re connect piping per figure6 Warning the discharged water may be hot be cautious to prevent scalding injury Indication Light off No hot water Indication Light off Water temperature too high Indication Light on No hot water Water too hot Piping connection leaks Cover leaks 1 Heater is no plugg...

Page 11: ...WATER HEATER EWH 10 Electric Wall Hung Water Heater EWH 10 Electric Wall Hung Water Heater 9 EWH Figure 7 Wiring Diagram ...

Page 12: ...or improvements at any time without notice 0 2k 06 2008 ADD No 336 Yao Xin Avenue NETDZ NANJING JIANGSU P R CHINA TEL 025 85801000 FAX 025 85803100 P C 210038 Http www aosmith com cn 407092 003 Rev 04 WATER HEATER A O SMITH CHINA WATER HEATER COMPANY LTD ...

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