Furman PST-8D Manuel page 7

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Indicators
Extreme Voltage Shutdown Indicator
Furman's SMP+ circuit senses sustained voltages that are high
enough to cause damage to your components, and shuts the
power down before damage can occur. Such conditions can include
accidental connection to a 240VAC source (where 120VAC is
expected), or an open neutral from a 208 or 240VAC source.
The Extreme Voltage Shutdown LED is normally off. If an input
voltage in excess of 137VAC is sensed, either on initial power-up
or during normal operation, the PST-8D will shut off power and this
indicator will light.
NOTE: If the mains power is above the high cutoff voltage and has
caused the unit to remove power from its outlets, it can not restore
power without the operator manually turning the unit off then on
again. Avoid turning the unit back on without first checking the source
of the problem, and perhaps changing the AC source.
Protection OK Indicator
Although the Furman SMP+ circuit assures virtually maintenance-
free protection from transient voltage spikes and surges, nature
has a way of occasionally creating electrical forces that are beyond
the capabilities of any transient voltage surge suppressor device to
absorb without some degree of damage. In the rare instance that
this occurs, the blue "Protection OK" LED indicator will turn off. If this
happens, some level of protection from voltage surges will remain,