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Showing posts from June, 2020

Rheem Pronto Tankless Water Heater Repair

Appliance failure #2! The culprit was our Rheem Tankless Water Heater and took a fair amount of spelunking through the web, service documents, and a good old fashioned teardown to resolve the issues - plural as there were actually two error codes generated.
Error Code "76"The first error code indicated communication failure between the "Remote" (HMI device which attaches to the wall next to the water heater) and "PCB" (as there is only one printed circuit board in the unit, Rheem refers to it as "PCB").
Upon examination of the PCB, I noted a few of the capacitors had bulged. Typically one would desolder and replace with comparably rated parts, but with 1/2" of potting compound encasing the board, it would be quite the operation to selectively remove and re-pot.
I came across a random post on Amazon which mentioned resolving the issue by shorting the communication terminals with a capacitor - this implies that degradation of the capacitor(s) al…