Hi Paul,
This is normal.
The igniter is wired in series with the burner valve. When the thermostat calls for heat, line voltage is applied to the circuit. As the igniter begins to glow, the current increases. The current flow causes the gas valve to open when the igniter becomes bright red (almost white). Flat igniters operate from 3.2 to 3.6 amps. The gas valve stays open as long as the igniter stays "on".
Happy Holidays!
Gene.
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