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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.
There are about 8 reasons why this is happening. Rater than going into each and every one, I have included a link to an Owners Manual, that under the Troubleshooting Sections (pages 12 & 13) it will provide you with the scenario and how to solve the problem. This manual may not be the exact same one as your heater, but they all work the same and have the same problems.
Bit concerned on giving advice on this one other than take it to GOOD servicemen and get it checked out properly. Cleaninbg the filters is Ok, the large one slides out to the top, the smaller one unclips, push in the two tags (closest to the centre of the heater) and it sort of hinges off from the other side of the filter. Give these a good clean. It might just smell because you have disturbed smaller dust particles that are being burnt. Mums know best, if you are worried, get it looked at and don't use it!
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