Service soon: it is time to flush the heat exchanger.
Rinnai SS is the service-soon timer, not a lockout. The manual says it is time to flush the heat exchanger (section 6.3). Pressing On/Off five times in five seconds clears the code. It is not code 14, which is heat exchanger overheat.
Likely causes
- The service-soon timer set in the parameter settings has run out
How to fix SS: safe DIY steps
- SS means the heat exchanger should be flushed so scale does not damage it. The procedure is section 6.3. Hard water has to be treated or the scale comes back
- To clear the code after service, press the On/Off button on the temperature controller 5 times within 5 seconds
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
If you have not flushed this model before, have the installer or a licensed technician do section 6.3 rather than clearing SS and ignoring it. The manual says the flush is what prevents scale damage.
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