Replacement Parts List

ManualsBrandsNoritz ManualsPlumbing40 Gal. Tank Replacement Natural Gas High Efficiency Indoor Tankless Water Heater w/ 12-Year Warranty and Wi-Fi Capable

707

731

179

706

179

700

072

707

731

072

701

708

702

709

179

705

EXS

ElectroniccontrolunitNRC663-FSV

PartNos. PartNames OrderNos. Q'ty/unit

700 CircuitBoard SKJ70WT 1

701 CircuitBoard SHC701M 1

702 Cover-CircuitBoard EXSA022 1

705 WiringHarness-NRC663-FSV SKJ70WU 1

706 PowerSupplyCord ERUJ001 1

707 WireClamp-Nylon 7287909 2

708 Label-CircuitBoardPlasticCover EVPK006 1

709 MountingPlate-CircuitBoard EXSA021 1

731 Screw-RemoteTerminalCoverM4X12S410

750

761

762

752

751

760

803

802

Remotecontroller,AttachedsetNRC663-FSV

Attachedset

Specialpart Specialpartno.

<Specialpart>

Owner'sguide

888

Installationmanual

889

Optional

Remotecontroller

RC-7651M-ENG

Remotecontroller,AttachedsetNRC663-FSV

PartNos. PartNames OrderNos. Q'ty/unit

750 RemoteController-RC-7651M(SET) QXUJ017 1

751 Cover-Remote QMEA003 1

752 MountingPacking-Remote QHUA115 1

760 ScrewPackage-Remote(SET) QQUA100 1

761 Screw-RoundHeadWoodM4.1X25S305

762 DryWallAnchors6X25

800 Box-NRC663-FSV SKJ70WV 1

Label-GasTypeLP ESCK008 1<LP>

802 WoodScrewset5 SAF6007 1

803 Screw-RoundHeadWood4.8X38S305

888 Owner'sGuideNRC663-FSV SBB809K 1

889 InstallationManualNRC663-FSV SBB809L 1

(RIGHT SIDE)

Thermal Fuse Installation Procedure

(BACK)

Install the thermal fuse following the below procedure.

1. Begin the installation by attaching the thermal fuse to the right side

of the heat exchanger.

2. Bend the thermal fuse to the back of the heat exchanger and fixing

the thermal fuse by the fastener at attachment point 1 as indicated

in the above illustration.

3. Continue wrapping the thermal fuse around the heat exchanger

securing it at each attachment point using the fasteners shown in

the above illustrations.

Caution

The thermal fuse may snap if it is twisted,

pinched or bent too sharply.

Do not bend the thermal fuse to a radius of

less than 1.25".

Freeze Prevention Heater Installation Procedure

Please check the present position and re-install to the original position.

Install the freeze prevention heater according to following illustrations.

(LEFT SIDE)(FRONT)

Procedure for Flushing the Heat Exchanger

If the error code “C #*~C #*” is flashing on the Display Window, it means there is Scale Build-up

in the Heat Exchanger.The Heat Exchanger needs to be flushed** to remove the Scale Build-up.

Damage to the water heater due to Scale Build-up is not covered by the water heater's warranty.

To clear the error code “C

#*~C #*”, the Heat Exchanger

If the error code “C #*” is displayed and flashing in the Display Window, please contact Noritz

America (866-766-7489).

* = 1, 2, 3, 4, F

# = 1, 2, 3, 4, 5, 6, 7, 8, 9, A, b, C, d, E, F

** Connect the “blue connector” for flushing on the Circuit Board when flushing the Heat Exchanger.

After connecting it, the water heater is set to “Flushing Mode”.

㻥䋱㪅㩷The preparation of the flushing system 㻦

1. Close the gas supply valve.

2. Close the water inlet valve (V1) and the water outlet valve (V2).

3. Connect the one drain hose (H1) to the drain valve (V3), and then the other to the circulating

pump.

4. Connect the drain hose (H2) to the circulating pump.

5. Connect the drain hose (H3) to the drain valve (V4).

6. Pour 4 gallons or more of flushing solution*** into the bucket.

*** Noritz recommends “White Vinegar”.

7. Place the both drain hoses (H2 and H3) into the bucket filled with the flushing solution.

Water Heater

Display Window

Bucket

Flushing

Solution

Circulating

Pump

㻥䋳㪅㩷Cleaning the Heat Exchanger 㻦

The flushing solution needs to be rinsed and cleaned out of the water heater.

Below is the way to rinse and clean the flushing solution.

1. Remove both drain hoses (H2 and H3) from the bucket. And then place the drain hose (H3)

into the sink or outside to drain.

2. Close the drain valve (V3) and then open the water inlet valve (V1).

Do not open the fresh water outlet valve (V2).

Clean the water heater with fresh water for 3 minutes or more.

(Needs to have enough time to clean the water heater.)

4. Close the drain valve (V4) and then remove the drain hose (H3)

from the drain valve (V4).

5. Remove the drain hose (H1) from the drain valve (V3).

Disconnect the “blue connector for flushing” on the Circuit Board.

The code

“C00” goes out on the Data Display.

7. Close the Front Cover.

8. Open the gas supply valve and water outlet valve (V2).

9 Check for correct operation of the water heater.

Detects the flow

1 minute passes

The water heater must remain connected to electrical power

when flushing the Heat Exchanger.

㻥䋲㪅㩷Flushing the Heat Exchanger 㻦

1. Open the Front Cover.

2. Connect the

“blue connector*****” for flushing on the Circuit Board.

3. Then the code

“CCC” is displayed on the Data Display.

4. Turn on the circulating pump to circulate the flushing solution through the water heater

for 1 hour at a rate of 1.5 gallons per minute or more.

5. The code

“C60” is displayed on the Data Display when the water heater detects the flow of the

flushing solution.

When 1 minute passes, the code

“C60” will change to “C59” on the Data Display.

6. When 1 hour passes, the code

“C00” is flashing on the Data Display.

Do not disconnect the “blue connector for flushing” on the Circuit Board.

7. Turn off the circulating pump.

*****The connector is located behind

the Circuit Board Plastic Cover.

The connector color is blue and

labeled “FLUSH”.

Data

Display

Please check whether the reverse connection of the hose (H1) and (H3) if the display number will not change.

In that case, the flow rate of the flushing solution may be under 1.5 gallons per minute.

Flashing

The water heater can not operate

if the “blue connector” for flushing is

connected.

**** Isolation valves may be purchased as an accessory from

㩷㪸㫅㩷㪸㫌㫋㪿㫆㫉㫀㫑㪼㪻㩷㪥㫆㫉㫀㫋㫑㩷㫎㪿㫆㫃㪼㫊㪸㫃㪼㫉 .

They allow for full diagnostic testing and easy flushing of the system.

Contact Noritz America for more information (866-766-7489).

FLUSH

Connect

Disconnect

FLUSH

Please contact Noritz America if more information is needed for flushing.

(Phone # : 866-766-7489)

This procedure is only intended for use by a qualified service professional or authorized Noritz

Service Representative. Any unauthorized use of this procedure may result in voiding the

warranty.Please contact Noritz America (866-766-7489) for additional support.

Isolation valves**** are necessary for

flushing the Heat Exchanger.

Gas Supply

Gas Suppy Valve

Continue to connect

Water

Inlet

Water

Outlet