The blower on a boiler is activated by a timer in the control module.
Typically on a call for heat the signal starts the hot water circulating pump, then if the hot water flow switch closes, power is sent to the exhaust blower, then if the *pressure switch closes indicating a vacuum in the combustion chamber, the ignition is energized and the gas valve is energized...
beyond that, if the flame sensor fails to detect flame within 5 seconds of the gas valve opening, the gas valve is de-energized, and ignition is attempted 3 more times, if after 3 tries the flame sensor does not detect flame, the boiler goes into lock out mode.
*in the absence of a pressure switch, there is a flue damper motor with an end switch it that must close before ignition can occur.
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