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Cleaning the Heat Exchanger
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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).
3. 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).
8. Open the gas supply valve and water outlet valve (V2).
9. Check for correct operation of the water heater.
6. Disconnect the “blue connector for flushing” near the Circuit Board.
The code “C00” goes out on the Remote Controller.
7. Close the Front Cover.
Disconnect
Detects the flow
1 minute passes
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Flushing the Heat Exchanger (For Single Unit)
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1. Open the Front Cover.
2. Connect the “blue connector*****” for flushing” near the Circuit Board.
3. Then the code “CCC” is displayed on the
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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 Remote Controller when the water heater detects the flow
of the flushing solution.
When 1 minute passes, the code “C60” will change to “C59” on the Remote Controller.
6. When 1 hour passes, the code “C00” is flashing on the Remote Controller.
Do not disconnect the “blue connector for flushing” .
7. Turn off the circulating pump.
***** The connector color is blue
and labeled “FLUSH”.
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
FLUSH
Connect
CCC
CCC
C60
C59
C00
Manifold Plate
Circuit Board
Water Heater
Circuit Board
****** LED light is only for “NCC199OD(GQ-C3257WZ US)” and“NCC199DV(GQ-C3257WZ-FF US)”.
It is flashing while flushing. When 1 hour passes, LED light is OFF.
LED light is flashing******
Water Heater
Water
Drain Valve
NOTE : If NRC111 (GQ-C3257WX ) or NCC199 (GQ-C3257WZ ), is installed,
the unit has a “Water Drain Valve” on the bottom of the water heater.
Place a bucket under the water heater to drain water from the "Water Drain Valve".
Carefully unscrew the "Water Drain Valve" to rinse flushing solution out of
the water heater for about 10 seconds, then close the "Water Drain Valve".
Manifold Plate
