Steve, there are a several of basic things that can cause this problem.
1. Air filter is clogged. Turn electrical part of unit OFF, Remove and Clean Filter, if necessary.
2. Air intake obstruction. Look for air intake obstruction around the front of the heater.
3. If your unit is a flue-less heater, Oxygen Depletion Sensor (ODS) may be partially clogged with
dust, link or pet air. Clean Pilot Assembly using canned compressed air with a straw nozzle (like
you clean your computer with).
4. Gas pressure fluctuation to the heater. This will require a service call from an authorized Rinnai
Service Technician,
Hope this helped you to troubleshoot and solve the problem.
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