Rheem No Power / Control Circuit Dead

Rheem air conditioner will not start at all; no indoor fan, no outdoor unit operation, and no display.

Advertisements

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.

Advertisements

Possible Causes

Tripped breaker or blown fuse at service panel, Tripped outdoor disconnect or blown fuses, Failed indoor transformer or control fuse (for conventional split systems), Loose line-voltage connections at air handler or condenser

How to Fix / Troubleshooting

Safety first: Before resetting breakers, identify and correct any obvious short circuits or burnt wiring. Turn off all disconnects before opening panels.

  • Check breakers: Inspect the main electrical panel for tripped breakers feeding the Rheem air handler and condenser. Reset once if tripped.
  • Inspect disconnects: At the outdoor unit, open the disconnect and check for blown fuses (if fused type). Replace only with the same rating after correcting any faults.
  • Check indoor control fuse: On Rheem air handlers, locate the low-voltage control fuse on the circuit board (often 3–5 A automotive style). Replace if blown, but investigate for shorts in thermostat wiring or contactor coil.
  • Verify thermostat power: Ensure the thermostat display is on. If blank, there may be a 24 V control power issue.

Warning: If fuses or breakers trip again immediately, do not keep resetting. Call a professional to locate the short.

Advertisements

Repair Difficulty

Medium 3/5

Required Part

Rheem Air Handler Control Board Fuse / Outdoor Disconnect Fuses
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements