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

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A Noritz 6.3 gal water heater fires then goes out then refires

I installed a new Noritz 6.3 gallon water heater and tried to start it up. I turned on the power and then opened the kitchen faucet for hot all the way. The unit started up clicked and fired up the burner. The fan went to high and the hot water started to warm up. It stops heating and the unit tries to fire up the burner again. The process continues about every three seconds.I have now increases the gas line from the gas meter to the heater unit to 3/4 inch gas pipe. The problem still exist. What could be the problem? If you know the answer please help.

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  • 349 Answers

Check thermocouple , sounds like it's not sensing flame.

Posted on May 12, 2010

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