Byrant 373LAV (1998) Gas furnace Hot Surface Ignitor Problem


Old 11-28-14, 10:24 AM
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Byrant 373LAV (1998) Gas furnace Hot Surface Ignitor Problem

Ignitor will not start. Tried replacing it. Finally isolated problem (voltmeter) that HSI connector is only drawing 5 volts instead of 115. Can I just buy a replacement connector to the circuit board? or does the entire circuit bord need replacing?
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Old 11-28-14, 12:20 PM
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Start by using an AC voltmeter to see if the pressure switch is closing. If you see 24 VAC on both sides of the pressure switch electrical connections the pressure switch is closed.

If you have 24 VAC on one side of the pressure switch only, or no voltage, report that here.

When the thermostat calls for heat, it should turn on the inducer motor. When the inducer motor comes up to speed, the pressure switch should close. When the pressure switch closes the circuit board should then turn on the 120 VAC to heat up the hot surface ignitor.

Until you verify that the pressure switch is closed, you don't know if the HSI should be energized.
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