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Kelly MedinaSep 12, 2025
How to fix overheating detection CH thermistor malfunction on Rinnai REB-KA2024FF?
- EEric AdamsSep 12, 2025
If your Rinnai Boiler indicates an overheating detection CH thermistor malfunction, check that at least one room valve is open. Open the manual air drain point on the upper side of the allotter to remove air. Clean the CH return filter. Turn the boiler off and on again by pressing either the CH or DHW mode button. If the problem persists, contact Rinnai service.
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