Rinnai RHFE-1510F - Manual (Page 7)

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Locking the control panel will prevent people tampering with the adjustments.
If lock lamp is on, the control buttons will not alter the operation of the heater.
(For Safety, if you push the stop button during operation, the heater will stop.)
To alter the heater, you must cancel the lock function.
When
glow the Lock function is set.
l
ure
ure
always
While the temperature is altered the set temp lamp will be lit and the set point will be displayed.
After 5 seconds the current temp lamp will light and the current temperature will be displayed.