Rinnai HE Series How To Use Manual page 171

1. Inspect condensate drain line for blockage.
2. Inspect condensate trap and tank inside cabinet for blockage.
3. Ensure condensate line has an air gap between the unit and drain line leaving the water
heater.
4.
Check sensor wiring harness for loose, broken or damaged connections from sensor back to PC
board.
5. If condensate tank is draining and the unit is still throwing a code 25 replace condensate
tank with sensor.
Code 25 Troubleshooting Procedure
Condensate Trap is full
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