Girard Products GSWH-1 Service Manual page 16

Whenever the Circuit Board senses flame during the ignition trials, sparking stops and the Gas
Valve remains energized. The Water Flow Switch, the Sail Switch and the Burner flame are
constantly monitored to assure that the system continues to operate properly.
When the Hot Water faucet is closed and the Flow Switch opens, the demand for heat ends and
the Gas Valve is de-energized immediately; after the post purge and cool off period of 90 +/-
seconds the blower is turned off.
Flame Failure
If the established flame signal is lost while the burner is operating, the control will sense this
and respond within 0.8 seconds. The gas valve will stay energized and the Ignition Spark will
be energized in an attempt to relight the burner (trial for ignition). If the burner does not light,
the control will make two more attempts to relight and then go into lockout (See Try for Ignition-
page 10). If flame is established.
Combustion Airflow Problems
If the airflow signal is lost, or the ECO opens during heat mode, the gas valve is immediately
de-energized and the blower stays on. If the switch closes again, a normal ignition sequence
will resume. If not and this condition persists for more than five minutes, the control will enter
lockout (See Try for Ignition - page 10) with the blower off.
Water Heater LED Diagnostics
If the water heater stops operating normally, check the LED indicator on the user panel located
behind the water heater door. If the LED is lit or blinking, consult the list below to help diagnose
the fault detected by the Circuit Board:
• Steady On – Internal Control Fault
• 1 Flash
• 2 Flashes – Flame Detection Error
• 3 Flashes – Lockout
• 4 Flashes – N/A; Reserved for future diagnostics
• 5 Flashes – Low voltage
The pattern will be repeated at intervals of 3 seconds.
– Air Fault
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