Rheem T131 Error Code: Clean filter reminder
Updated October 2026 · Sourced from Rheem documentation
✅ Usually fine to keep running
The manual says this is an air filter routine maintenance reminder.
Is it safe to keep running? Usually yes. Call a service provider only if the reminder will not clear after cleaning the filter.
T131 at a glance
| Code / how it shows | Meaning | Applies to |
|---|---|---|
| T131 Alert shown on the display | Clean filter reminder | Rheem Electric Residential Hybrid (heat pump) water heaters, Use & Care Manual AP23657 Rev 01 |
Check this first
Only steps a homeowner can do safely. Do not open electrical panels or the burner area.
- Set the mode to Electric or OFF.
- Remove the air filter and wash it with a mild detergent, dry it and reinstall it, as the manual says.
- Set the unit back to the desired mode.
🛑 Stop and call a licensed pro if
- Call a service provider only if the reminder will not clear after cleaning the filter.
- You smell gas. Leave the house, do not touch switches, and call your gas utility from outside.
- Codes for flame failure, overheating, venting or the control board that return after one reset.
- Water leaking from the heater, the relief valve discharging, or scorching around the burner area.
- A carbon monoxide alarm sounds. Get everyone outside and call 911 or the fire department.
Safe first steps for any Rheem code
- Write down the exact code shown on the controller or the number of status light flashes.
- Turn the water heater power off and back on (or press the reset button the manual describes) once. If the code comes back, stop resetting.
- Make sure the gas supply valve to the heater is open and other gas appliances in the home are working.
- Make sure the cold water supply valve is fully open and hot water taps are not partly closed.
- Look at the outside vent terminal for snow, ice, leaves or anything blocking it (look only).
Source: Rheem Electric Residential Hybrid Water Heater Use & Care Manual AP23657 Rev 01, Troubleshooting Alarm Codes, p. 33. Codes are series-specific, so your unit's own manual is the final word. Reviewed October 2026.
Ryan Giles · Red Seal Certified Plumber · Ask a plumber · Ask an HVAC technician
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