GSW SUPERFLUE POWER VENTED GAS FIRED WATER HEATER - Manual (Page 10)

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Important: in locations where a sump pump failure, flooding or
exposure to water may be present, a ground fault receptacle is
recommended.
VI)
Lighting and Operating Instructions
WARNING READ BEFORE PROCEEDING
If you do not understand and follow these
instructions, a fire or explosion may result.
This
Superflue
 Water Heater is equipped with an electric
combination thermostat / gas valve control and an ignition device
that lights the burner.
DO NOT ATTEMPT TO LIGHT
THIS WATER HEATER MANUALLY! The control
contains internal self-diagnostic features and an external LED
monitor light (Figure 11).
During operation a flashing LED indicates a burner or ignitor
failure, putting the system into a safety lockout condition. This
control uses three attempts at ignition before locking out. To
reset a system in lockout, disconnect electrical power, wait ten
seconds and re-energize. If the system fails to re-start, see
trouble shooting section.
A “constant on” LED indicates an unserviceable fault within the
control, and cannot be reset. The complete control must be
replaced.