American Standard Complete System No-Start

American Standard air conditioner will not start at all, no indoor blower and no outdoor unit operation

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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

Tripped main HVAC breaker, Blown indoor transformer fuse, Failed 24V transformer, Faulty thermostat or no power to thermostat

How to Fix / Troubleshooting

Safety first: Turn off power at the main panel before opening the air handler or furnace.

  • Check main breakers: Verify that both the indoor and outdoor unit breakers are ON and not tripped. Reset if necessary.
  • Check thermostat display: If the thermostat is blank, replace batteries (if applicable). If still blank, there may be no 24V power.
  • Inspect low-voltage fuse: On the indoor control board, check the 3A/5A fuse and replace if blown. If it blows again, there is a short that must be found.
  • Professional transformer test: If the fuse is intact but there is no 24V between R and C, a technician should test and replace the 24V transformer if failed.
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Repair Difficulty

Medium 3/5

Required Part

24V Transformer
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