We have a 3 year old Navien CH240 unit that currently heats the house (radiant floors) and hot water. Recently we've been losing hot water and getting a 02E error. Apparently it corresponds to low water pressure. We had a plumber come in and perform maintenance and cleaning of the filters. That seemed to work for a couple of days, but the problem is still there, although currently intermittent. The heat will go out and couple of hours later will be on again. Any ideas?
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