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How old is the unit? Was it professionally installed?
This has been an issue ever since it was installed?
If you look on the vent coming out of the top of the unit, do you see a clear, flexible tube on a barb? If so, will you check that out is clear by pulling it off? When you pull it off, did water come out? Do you still have the manual? If so, will you also confirm that the dip switch settings are correct? The manual has directions but if there is any doubt at all, do not adjust them. You can still confirm that they are in the correct settings to the best of your ability, but if they seem to be on the wrong setting but you are not sure, do not adjust them.
The temp setting is different than the dip switch settings. You would have to remove the cover to check that. The dip switch settings are for the max temperature setting and the elevation that you are at. The manual should be in the pouch that is taped to the unit itself. The error code can be caused by a couple of things but most of the time is an issue with the venting or the dip switch settings. The dip switch settings are a moderately difficult issue to inspect but if it is related to the venting it will require some professional help unless you are quite familiar with venting issues and how to repair. The venting requirements are also defined in the manual but are also not really a novice level type of issue to address.