Rheem Tankless Gas Code 24
Remote control buttons held down. The most benign code in Rheem's table: remote control buttons were depressed for more than 20 seconds. Rheem's instruction is simply to release the buttons and operate the unit — and only if code 24 appears again does it become a remote control diagnosis.
DIY fixThe verdict
No parts needed — reset or re-check a setting
Free. Something is holding a button down — a stuck key, something leaning against the remote, or moisture behind the panel. Release it and the unit carries on. If it comes back with nothing touching it, the remote itself needs looking at.
Typical cost: $0–$300
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. 54), read Aug 2026 — the manufacturer's own documentation for this exact series.
What you can safely check
- Check nothing is pressing against the remote control and no button is stuck down.
- Release the buttons and operate the unit normally.
- Look for moisture or condensation on the remote — a common cause of a key that reads as held.
- If code 24 returns with nothing touching it, book a service call for the remote.
Frequently asked questions
The remote is in a bathroom and this keeps happening.
Steam is a good suspect. Moisture behind the panel makes a key read as pressed, and a remote mounted where it gets showered on will do this repeatedly until it is moved or replaced.