Rinnai ByPass Servo Troubleshooting Manual page 42

when the water is turned back on within a few minutes of the demand system cycling,
and cold water sandwich is created.
j. Loose or bad electrical connection inside the water heater or power supply to product.
Power supply could be dropping out momentarily due to a component heating up, loose
wiring connections, etc.
k. Low flow shower heads especially in area with high ground water temperatures.
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