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Well, its been 3 yrs since I put the WHN055 into service at the house and was greeted to an amber maintenance reminder. Currently sitting at 10250/8500 heating and 5270/470 hrs for DHW (cycles/hrs). Should I consider opening and cleaning out the combustion chamber/burner?
I did the install myself and honestly never even had the combustion analyzed... but it's been working great. Maybe someone can offer a recommendation for a local tech.