Troubleshoot

HEATING SEQUENCE OF OPERATION
• Call for heat
• T stat contact close T stat on terminals R & W of board
• 24 volts from R to W terminal on board
• Power exhauster cycles on. 115 VAC at IND and Neutral on board.
• Starts pre purge cycle
• 24 volts through limits and pressure switch from board
• Short delay and then 24 volts to gas valve from board
• Igniter sparks
• Flames carries to sensing probe and proves
• Yellow light turns on, burner stays lit.
• 50 to 60 seconds later, fan motor cycles on.
• 115 volts at EAC and Neutral terminals.
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