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New Rinnai E110CP w/ error code E29 Code
I have a recently installed E110CP that has an E29 error code issue that won't go away. Sometimes it comes up when the boiler is under heavy load (heat and DHW) and other times it seems completely random. The unit will go into "fan check" mode and then throw the error if the fan stays on too long. Rinnai already had us replace the fan once already, but that didn't change anything.
I know E29 is a ventilation issue, but the vent is a short concentric ubbink kit (about 8 feet) with 1 90 degree elbow so I don't think there's any issues with that. There's nothing outside the house to cause any obstruction.
Anyone else run into E29 with this unit?
Thanks in advance,