Rinnai Rucs75ip tankless water heater flow issues

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Coolbuddie

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Feb 15, 2020
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Mn
Hi I have a Rinnai tankless water heater all of a sudden when filling the the tub the flow has dropped way down and and it it’s not as hot as it should be. When I pull up the codes in the control r app it’s all zeros. I replaced the Water Flow Servo & Sensor gas pressure is where it should be. I’m thinking it might be the pc board. Does anyone have any thoughts?
 
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