Question about Noritz 6.9 Gallon Residential Direct Vent Tankless Water Heater - N

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Is there an eternal fuse?

I just came home from vacation and my water heater has no power. I power to the unit. Nothing comes on.

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There is a GFI on the bottom right hand corner of the heater. It is a black box with 5 wires on the bottom in this order: blue, white, green ground, black, and white. The voltage across the blue/white should be about 100VAC and the voltage across the black/white should also be 100VAC. If the black/white isn't registering any voltage, the gfi is tripped.

The GFI typically trips due to moisture in the unit; however, it can also be fried if there was a voltage surge while you were gone. Use a hair dryer to dry up any moisture inside the unit, specifically around the GFI. If the water is pooling or you see a visible drip coming from the top of the heater, you heat exchanger is probably leaking and needs to be replaced.

If you have voltage on both sides of your gfi, check the voltage at the remote terminals. You should have 15VDC. If there is no voltage, you circuit board is damaged and needs to be replaced. If there is voltage at the remote terminals but no display on your remote, then check your remote wiring.

Posted on Aug 01, 2010

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Copy following link to troubleshoot by type of gas control valve, instructions how-to-light-water-heater, including error codes etc:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
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Check that gas shut-off is parallel to gas line:
http://waterheatertimer.org/images/Gas-water-heater-89-valve-2.jpg
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This model has thermopile instead of thermocouple. Basically thermopile is several thermocouples. When heated, thermopile generates enough current to run small electronic circuit inside gas control valve. This circuitry is very common in hvac units but fairly recent to water heaters. Advantage is error code troubleshoot and more optional controls, for example future response to in-home zwave remote controls and home automation
Get model number and brand from label on side of tank and post question on pro water heater forum with list of what you have tried so far.
http://www.thetankatwaterheaterrescue.com/forums/forum3/
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Water heater and gas valve are not clear:
Add a comment with description of water heater and gas valve for possible help.

Open following link for White Rodgers intelli-vent gas valve thermostat:
http://waterheatertimer.org/pdf/Intelli-vent-gas-valve2.pdf
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html#Intellivent

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2) Also check that 120Volt electrical outlet has power, and check outlet with cheap circuit analyzer from home center.
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Read the warranty papers and find out what the warranty says.
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As far as fixing the water heater, it sounds like a professional plumber would be a good bet at this point.
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No power


Since I don't have a brand or model number, I'm assuming its a limit switch that needs to be reset. If not, it's possible that while you were away, you experianced a power surge and blew the board. Check for any place that could have a fuse.

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