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I'm working on one that has an intermittent error code F16 (flapper stuck open). I pulled the fan motor off and inspected the flapper. No visible damage. I tested the switch on the flapper by manually opening and closing the flapper. It's working fine. HTP says the venting on the unit is fine, i'm not sure I agree. The terminations in the attached photos are as follows, tee on the exhaust, downturned 90 on the inlet. The 2 pipes without any fittings are not connected to anything.
HTP recommends replacing the burner assembly. It's an expensive part.
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