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Sequence of Operations
LINE See Flashing LED table
24 VAC
Igniter remains on for an addition 4 seconds. ECO/VENT SWITCH
CONTROL HEALTH
Burner lights. WATER TEMPERATURE
COMB BLOWER
Presence of flame is rectified. PRESSURE SWITCH
IGNITER ELEMENT
GAS VALVE
YES
Water is heating. LINE See Flashing LED table
24 VAC
(Notice igniter element LED is OFF.) ECO/VENT SWITCH
CONTROL HEALTH
Verify flame presence through sight window. WATER TEMPERATURE
COMB BLOWER
PRESSURE SWITCH
GAS VALVE
YES
Water reaches thermostat setting - plus 4˚. LINE See Flashing LED table
24 VAC
Gas valve closes. Burner turns off. ECO/VENT SWITCH
CONTROL HEALTH
COMB BLOWER
PRESSURE SWITCH
YES
Water is heated to thermostat setting. LINE See Flashing LED table
24 VAC
ECO/VENT SWITCH
Heater returns to idle state. CONTROL HEALTH
Action
System Lights (LEDs)
Flashing LED indicates a
problem
TROUBLESHOOTING
Power is applied to the gas valve. Gas flows into the
burner chamber.
NO
Combustion blower runs for an additional 30
seconds to purge the burner chamber of combustion
gases.
Blower motor stops.
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
NO
NO