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When 120 VAC input power is properly connected to the Ignition Control Board, the green LED will illuminate. If an error is made when connecting 120 VAC input power, this LED will not light. Improperly connecting the input power may result in a false flame sensor failure. Fuse Protection The 24 VAC circuitry is protected with a 3 amp auto fuse. If the fuse opens, a red LED located near the fuse will light. If the red LED is illuminated, replace the fuse (recommended replacement part is Little fuse p/n 257003 automotive fuse). Repeated failure of the fuse is an indication of possible damage to the ignition control board. NOTE: One extra fuse is supplied with the boiler. Typical Control/Appliance Operating Sequence 1. When power is applied to the WHC1502 ignition control, the Display board will initially run through a self-diagnostic routine, and then go into its operating mode, displaying the temperature sensed at temperature probe #1 (Outlet). 2. If the ignition control board determines the actual outlet water temperature at the temperature sensing probe (probe #1) is below the programmed temperature set-point less the switching differential, and the thermostat circuit or tank probe circuit closes, call for heat is activated. 3. The ignition control board then performs selected system diagnostic checks. This includes confirming the proper state of the ECO/High Limit device, flow switch, and pressure switches. 4. If all checks are successfully passed, the circulating pump circuit is energized, then the combustion blower is energized for the 20 second pre-purge cycle. 5. When the pre-purge cycle is complete, the ignitor is energized. The pump and blower should continue to run. 6. The ignition control board will verify ignitor current. After the verification, the gas valve will open, allowing gas to enter the burner. 7. After an additional 1 second, the ignition control board will monitor the flame sense probe to confirm a flame is present. If a flame is not verified within 4 seconds, the gas valve is immediately closed, and the ignition control board will return to step 2, unless jumper J30 is in place (ON), see figure 2. perature is reached, and the thermostat circuit opens. At that point, the gas valve is closed and the control enters the post-purge and post-circulating cycles. 9. The combustion blower will run for a 25 second post purge cycle. When the post purge cycle is complete, the blower is de-energized and will coast to a stop. The circulating pump will continue with the post-circulate cycle for the selected amount of time, factory default is 45 seconds. See circulating pump adjustment procedure on page 5 and 6 of this manual. 10. The control now enters the idle state while continuing to monitor temperature and the state of other system devices. If the outlet temperature drops below the set-point value minus the switching differential, and the thermostat circuit or tank probe circuit closes, the control will automatically return to step 2 ...

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