Question about Noritz 6.3 Gallon Residential Tankless Water Heater - N-063S

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We had a power outage. The light on the power button of the Noritz tankless water heater remote control does not come on. Help1

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I'd first try cutting electricity to the unit and then powering it back up; however, there's a good chance you unit was damaged from a voltage surge following the power return. If you have a volt meter, here are a few things to check:
-voltage across the gfi - the gfi is located on the bottom of the unit; it is a black box with a blue, white, green, black, and white wires coming into it. There should be about 100VAC across the blue/white and black/white pairs.
-If there's no voltage across either pair, your transformer is fried and needs to be replaced.
-If there is voltage across the blue/white but not the black/white, look for moisture in the bottom of the unit. If there's no visible moisture (indicating a leak), you may need to replace the gfi.
-If there's voltage on both sides of the gfi, measure voltage at the remote terminals (location depends on model). You should have 15VDC across the terminals. If there's no voltage, your circuit board is dead.

Good Luck!

Posted on Aug 04, 2010

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1 Answer

We hada power outage. The light on the power button from the noritz tankless water heater remote control does not come on.


I'd first try cutting electricity to the unit and then powering it back up; however, there's a good chance you unit was damaged from a voltage surge following the power return. If you have a volt meter, here are a few things to check:
-voltage across the gfi - the gfi is located on the bottom of the unit; it is a black box with a blue, white, green, black, and white wires coming into it. There should be about 100VAC across the blue/white and black/white pairs.
-If there's no voltage across either pair, your transformer is fried and needs to be replaced.
-If there is voltage across the blue/white but not the black/white, look for moisture in the bottom of the unit. If there's no visible moisture (indicating a leak), you may need to replace the gfi.
-If there's voltage on both sides of the gfi, measure voltage at the remote terminals (location depends on model). You should have 15VDC across the terminals. If there's no voltage, your circuit board is dead.

Good Luck!

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