Sequence of Operation
Abnormal Operation (cont’d)
2.Temperature Sensor Fault:
A)Temperature Sensor Open Circuit: The gas control immediately turns off all out- puts and proceeds to flash 8 times then 3 times with a three second pause. The error self clears if the fault clears for at least 15 seconds.
B) Thermal well sensors not reading the same temperature within ±5.5°F: The gas control immediately turns off all outputs and proceeds to flash 8 times then 3 times with three second pause. The error self clears if the fault clears for at least 15 sec- onds.
C)Water Temperature in excess of ECO (Energy Cut Off) Limit: The gas control immediately turns off the pilot and main valves. The gas control LED proceeds to flash 4 times with a 3 second pause.
To reset the gas control, rotate the setpoint knob to the minimum setting for at least 6 seconds before returning to desired temperature setting.
3.Damper Safety Circuit Fault:
A)Damper Failed to Open: The gas control proceeds to flash 3 times with a three second pause. The gas control waits 5 minutes, and then tries to open the damper again.
B)Damper Failed to Close: The gas control proceeds to flash 2 times with a three second pause. The gas control waits 5 minutes, and then tries to open the damper again.
4.Trial for Ignition Fault:
A)Damper Jostled During Trial: The gas control stops the trial for ignition. The gas control proceeds to flash 3 times with a three second pause. The gas control waits 5 minutes, and then tries to open the damper again.
B)Flame Not Sensed: The gas control energizes the spark igniter attempting to light the pilot and prove flame. If flame is not sensed within 90 seconds, the spark igniter turns off, the pilot valve is closed. The gas control LED flashes 6 times then 1 time with 3 second pause. The control waits 5 minutes before re- peating the ignition sequence.
Page 11
11