Rinnai i120c combi boiler losing pressure (error code 430)

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SalMazz

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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?
 

Fitter30

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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?
What's the water pressure? Minimum is 13 lbs.
 

SalMazz

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What's the water pressure? Minimum is 13 lbs.
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 heating lines with a cleaner, isolated from the heating unit, when the weather permits. My pressure was fluctuating by the way and I did not see this at first but when I checked probably due to what I mentioned above. Hope this helps someone who has a similar issue.
 

SalMazz

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help still getting e430 code with Rinnani Combo boiler. It happens even when not asking for any hot water just when it cycles. I can't figure this out. Had posted pictures before maybe if I can I post a video.
 
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