Customer had a Rinnai tankless installed outdoors two years ago. The customer experienced an electrical surge recently and had electrical work done. The tankless is running hot to cold all throughout the house. Informed customer that electrical issues are unlikely since there are no error codes. Informed customer the first step is to flush the unit to get rid of unwanted debris buildup that can be affecting unit function. Did a monometer reading. Inh20 reading is in the correct range for the unit. Found no additional cold runs after running hot water for 5 consecutive minutes. Made customer aware that if the issue shows up again it is likely due to a cross connection and diagnosing that will be the next step. Also pointed out that there isn’t a full port gas shutoff and a street 90 restricting the flow of the gas and that can also be a contributing factor.
