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I have been in touch with Rinnai, and it seems that the E430 error on the combo boiler is due to sediment buildup causing the issue I was experiencing. I cleaned the filter screen under the boiler, which was dirty, and I plan to flush the system with vinegar. Additionally, I will flush my...

Help system was working from February 29,2025 until March 12, 2025 with no error code E430 once I adjusted the circulator. Now I am getting the E430 on occasions sporadic. Any thoughts maybe pressure switch?

Thank you i fixed the circulator and this was the problem. No error code since!!

I think it was the circulator, as I adjusted it and now since I done this no error code.

Can you help me understand what you mean by circulator upside down. I can rotate it so the control dial faces up to the ceiling. Is this what you mean?

Yes unit had a full checkup few months ago or September 2024.

I'm getting an E430 error code after two years, or my second season, here in NY, and I'm not sure why. The error occurs suddenly while the system is running. I spoke to Rinnai, but they weren't very helpful. The boiler provides heat to the house and hot water to only one bathroom. The rest of...