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Procedure for Flushing the Heat Exchanger
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.
If the error code "C #*~C #*" is flashing on the Remote C
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 must be flushed.
If the error code "C #*" is displayed and flashing on the Remote Controller (or Operation Panel**),
please contact Noritz America (866-766-7489).
*
= 1, 2, 3, 4, F
** NR98DVC(GQ-2857WX-FFA US) and NR83DVC(GQ-2457WS-FFA US) only.
*** Connect the blue connector marked "FLUSH" for flushing near the Circuit Board when flushing the Heat Exchanger.
After connecting it, the water heater is set to "Flushing Mode".
The water heater must remain connected to electrical power
when flushing the Heat Exchanger.
The preparation of the flushing system
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 1 gallon of "
Noritz recommends "
7. Place the both drain hoses (H2 and H3) into the bucket filled with the flushing solution.
8. Open the both drain valves (V3 and V4).
Isolation valves**** are necessary
for flushing the Heat Exchanger.
Water Outlet
V4
If a submersible pump is used,
then only 2 hoses will be needed (H1 and H3).
#
= 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
V2
V3
V1
Water Inlet
Flushing
Solution
Bucket
**** Isolation valves may be purchased as an accessory from
They allow for full diagnostic testing and easy flushing of the system
" and
Water Heater
V3
V4
H3
V2
Circulating
Pump
H1
H2
Water
Outlet
gallon water into the bucket.
" for flushing.
Continue to connect
Gas Supply
V1
Valve
Gas
Water
Supply
Inlet
.
** , it means
27
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