Rheem 76: Remote Control Communication Fault
The wired remote control panel on your Rheem tankless unit has gone blank, is flashing, or is showing 76 instead of a temperature — that's a communication fault between the remote and the unit's main control board, not a problem with the burner itself.
Applies to: Rheem/Ruud tankless gas water heaters with a wired remote control
What it means
Communication fault between the remote control and the main control board. The water heater itself often keeps running on its factory-default temperature setting even while the remote is unreachable, which is one way owners tell this code apart from an ignition or flame fault — the shower still gets hot, you just lose remote temperature adjustment.
Most common causes
- Damaged or loose remote control wiring
- Failed remote control
- Failed control board
What you can safely check yourself
- Inspect the remote control wiring at both the remote and the unit for loose or damaged connections and tighten/reseat them
When to call a professional
Wiring looks fine but the fault persists — the remote control or main board likely needs replacement. Note the unit can often still run on a default temperature setting even without the remote.
Gas supply lines, gas control valves, and venting should only be worked on by a licensed plumber or HVAC technician. Mains/line-voltage electrical work should be done with the breaker off and, beyond a simple reset, by a qualified electrician or plumber.
What the fix costs
Remote control wiring repairs are inexpensive if it's just a loose connection — often folded into a standard $75–$200 service call, per Angi's pricing data. A full remote control replacement part typically lands in that same range installed; if the main control board itself needs replacing instead, that runs closer to $250–$600 installed based on HomeGuide's contractor rate guide. These are national ranges, not a quote for your specific unit.
Related codes
- Rheem 65 — Water Volume Control Valve Fault
- Rheem 1L — Scale Build-Up Warning
- Rheem 29 — Condensate / Low Heat Exchanger Temp
- Symptom: water heater error code flashing or blinking
All Rheem codes
Every Rheem water heater fault code — the full list on one page.
Sources
- Rheem/Ruud tankless remote control and error code manual (manufacturer documentation)