Rheem Tankless Gas Code 82
Control board program chip malfunction. The program chip on the control board is not working correctly. That is the board's own software failing its checks, which makes it a board-level fault rather than anything you can reach.
Call a proThe verdict
Call a licensed plumber
Board-level, with no owner action. Check the warranty position before booking — a control board is the most expensive electronic part in the unit, and Rheem's parts warranty may still be running.
Typical cost: $400–$1,100
US estimate for parts and labor. Prices vary by region and by who does the work — see how we estimate costs.
What the manual says
The meaning above is transcribed from the manufacturer's diagnostic documentation for the Tankless Gas — not averaged across the brand.
Source: Rheem Tankless Gas Troubleshooting Pocket Manual (SVC820) (p. 92), read Aug 2026 — the manufacturer's own documentation for this exact series.
What you can safely check
- Note any recent power event, surge, or service work.
- Check whether the unit is still within its parts warranty.
- Book a licensed professional.
Frequently asked questions
Is a new board worth it on an older unit?
That is the honest question to ask your technician, with the quote in writing. A board plus labour is a meaningful fraction of a new heater, and it is the point where replacement deserves comparing.