I have a Navien CH180 that has been nothing but trouble since buying my house. It has been throwing 48e and 03e errors pretty regularly, and my local repair guy finally replaced my regulators and turned up the gas flow a little, and that has stopped. It has been 4 days since he did that repair, and 2 of the 4 mornings, I have woken up to no heat and a 15e error. Once I reset the unit it fires right up and works all day. Apparently 15e is for an "abnormal control board", and the manual just...
Navien CH180 Error Code Questions
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