Sequence of Operations
Action
Tank is cold, full of water, gas supply is connected to gas control valve and heater is connected to a
120 VAC circuit. Gas valve is set to the ON position.
YES
Turn electric to main power to ON. The control will display "00" which is a diagnostic check; then "120" which is the control voltage; then "08" which means plus or minus setting is 8˚ (4˚ above and 4˚ below) from thermostat setting; then "??" where ?? is the temperature of the water in the tank.
System Lights (LEDs)
Flashing LED indicates a
problem
None. No power has been applied.
LINE
24 VAC
ECO/VENT SWITCH
CONTROL HEALTH
NO
NO
TROUBLESHOOTING
Fill tank
Ensure gas connections are present and no leaks Ensure water heater is properly vented
See Flashing LED table
Unit is polarity sensitive. Ensure GREEN polarity LED on main control board is on.
YES
Thermostat calls for heat. Water temperature inside the tank has dropped more than 4˚ below the thermostat setting.
YES
Combustion blower is powered for a 40 second pre- purge cycle.
YES
Once there is sufficient combustion airflow, the pressure switch activates.
YES
Igniter begins 30 second warm up period.
YES
LINE
24 VAC
ECO/VENT SWITCH CONTROL HEALTH WATER TEMPERATURE
LINE
24 VAC
ECO/VENT SWITCH CONTROL HEALTH WATER TEMPERATURE COMB BLOWER
LINE
24 VAC
ECO/VENT SWITCH CONTROL HEALTH WATER TEMPERATURE COMB BLOWER PRESSURE SWITCH
LINE
24 VAC
ECO/VENT SWITCH CONTROL HEALTH WATER TEMPERATURE COMB BLOWER PRESSURE SWITCH IGNITER ELEMENT
NO
NO
NO
NO
See Flashing LED table
See Flashing LED table
See Flashing LED table
See Flashing LED table
26