Upon arrival customer had a tankless Noritz natural gas tankless heater that had an error code of 61. This error code is telling us the fan motor and mother board will need to be replaced. We are going to go ahead and replace unit with a Noritz NR662-od outdoor unit. We will order unit and be in touch with a date for installation. Customer provided a $1600.00 deposit Thank you for calling JohnThe Plumber -Shane