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Noritz 6.9 Gallon Residential Tankless Water Heater - N-069M - Page 3 Questions & Answers
Noritz water heater error code 99
MAke sure your flu is not making any 90degree turns. Use 45degree turns only. Error 99 is a combustion error. Usually referring to a blocked/obstructed flu. That said, a flu wit a lot of 90degree turns can act like restrictions to tankless heaters. If the flu i straight and clear, then you have a burner problem. Somethign you want Noritz to deal with.
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