Sequence of Operations
Action
Power is applied to the gas valve. Gas flows into the burner chamber.
Igniter remains on for an addition 4 seconds.
Burner lights.
Presence of flame is rectified.
YES
Water is heating.
(Notice igniter element LED is OFF.)
Verify flame presence through sight window.
YES
Water reaches thermostat setting - plus 4˚.
Gas valve closes. Burner turns off.
Combustion blower runs for an additional 30 seconds to purge the burner chamber of combustion gases.
YES
Water is heated to thermostat setting.
Blower motor stops.
Heater returns to idle state.
System Lights (LEDs)
Flashing LED indicates a
problem
LINE
24 VAC
ECO/VENT SWITCH
CONTROL HEALTH
WATER TEMPERATURE
COMB BLOWER
PRESSURE SWITCH
IGNITER ELEMENT
GAS VALVE
LINE
24 VAC
ECO/VENT SWITCH
CONTROL HEALTH
WATER TEMPERATURE
COMB BLOWER
PRESSURE SWITCH
GAS VALVE
LINE
24 VAC
ECO/VENT SWITCH
CONTROL HEALTH
COMB BLOWER
PRESSURE SWITCH
LINE
24 VAC
ECO/VENT SWITCH
CONTROL HEALTH
TROUBLESHOOTING
NO See Flashing LED table
If flame is not rectified, unit will make 2 more ignition trials. If there is no flame rectification after the third attempt, unit will go into LOCKOUT (flashing "LOC"). Press the red reset button to clear lockout condition.
Unit will wait approximately 60 minutes; then clear itself; then make another three attempts for ignition.
NO See Flashing LED table
NO See Flashing LED table
NO See Flashing LED table
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