Troubleshoot

ONE FLASH – PRESSURE SWITCH WON’T CLOSE
• Pressure switch does not close within 30 seconds of inducer energized
• Unit sequence: Green light on, call for heat, 24 VAC at
R & W , power exhauster cycles on, after approx. 30
seconds, Green Light will give One Flash
• Possible cause:
• Blockage in tubing to pressure or venting not allowing
for a proper vacuum to pull pressure switch contacts
closed. Troubleshoot Venting.
• Wire off pressure switch
• 24 VAC not coming from board.
• Defective pressure switch (verify and replace)
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