BLOWER ONLY / NO LED
Goodman Control Board Power Loss or Internal Failure

Blower runs continuously, but LED is off or very dim; no heat.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Blown 3–5A low-voltage fuse, Failed control board, Open transformer, Loose low-voltage connections

How to Fix / Troubleshooting

Safety: Turn off power at the breaker before accessing the control compartment.

Steps:

  • Check low-voltage fuse: Locate the automotive-style fuse on the Goodman control board. If blown, replace with the same amperage (typically 3A or 5A). If it blows again immediately, there is a short in the 24V circuit (often thermostat wiring or outdoor unit contactor coil).
  • Inspect transformer: Measure voltage at the transformer primary (115 VAC) and secondary (24 VAC). If primary has power but secondary has 0 VAC, replace the transformer.
  • Check board connections: Ensure all plug-in connectors and screw terminals on the board are tight and not burned.
  • Reset power: After replacing fuse or transformer, restore power and observe LED behavior.

If the LED remains off with proper power and a good transformer, the control board is likely failed and should be replaced with the correct Goodman OEM board.

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Repair Difficulty

Hard 4/5

Required Part

Furnace Control Board
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