Tired of daily error codes[ c6, c7, c8 -76] on my Paloma tankless water heater[ now discontinued ] It is 11.5 yrs old. Must reset everyday 1 or 2 times. Rheem, which take queries about Paloma, said I needed a replacement circuit board and chip which are in stock. Read numerous blogs from peers with the same problem. The trouble shooting wasn’t possible b/c of the location of the double wires which I could not reach. Hadn’t planned on a replacement heater due to budget and my low pension. Need to know if this heater is repairable.