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GOODMAN CMA80905CXBA FURNACE. INDUCTION BLOWER NOT ENERGIZING. GETTING 3 "BLINKS" FROM DIAGNOSTIC LIGHT (LOW PRESSURE SWITCH OPEN). THE A/C WORKS & THE BLOWER FAN COMES ON WHEN THE STAT IS IN THE HEAT MODE WITH THE FAN SWITCH ON. WHILE THE FAN IS ON , THE DIAGNOSTIC LED STILL BLINKS A CODE OF 3. THIS IS NOT A CONDENSING FURNACE. I BYPASSED THE STAT (W & R)TWISTED TOGETHER---SAME RESULT---DIAG LED COMES ON STEADY, THEN FOUR CLICKS, AND BACK TO THE CODE OF 3 BLINKS. CIRCUIT BOARD???? OR 120VAC NOT REACHING THE INDUCTOR FAN?? BATTERIES FRESH IN STAT. HEAT WAS FINE LAST WINTER---INSTALLED A/C MAY 08. THAT WORKED FINE. NOW NEED HEAT AND THIS HAPPENS. HIGHLY APPRECIATE ANY HELP. FYI...THE A/C IS GOODMAN ALSO. ALL PURCHASED AT THE SAME TIME, LATE SEP 07. DIDNT INSTALL A/C THEN BECAUSE WEATHER WAS SOON TO CHANGE.

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  • FALCONHAWKER Oct 02, 2008

    gonna try RIGHT NOW! Thanx for your thoughtful response.

  • FALCONHAWKER Oct 02, 2008

    Tried it. Nothing. I thought the darft motor has to come on first to close the switch. The draft motor isn't coming on.

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The pressure switch is closed before the draft motor closes it.the board is telling you that this is not right.pull the wire(either) off of the pressure switch to see if furnace tries to light.if it does,you should replace the pressure switch.

Posted on Oct 02, 2008

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