E5
Tempstar
Outdoor Unit Communication / Feedback Fault
Tempstar air conditioner shows E5 and outdoor unit does not start
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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
Broken communication wire between indoor and outdoor units, Faulty outdoor control board, Incorrect dip switch or configuration settings, Blown low-voltage fuse on indoor board
How to Fix / Troubleshooting
Safety first: Turn OFF power to both indoor and outdoor units.
Checks:
- 1. Inspect communication cable: Trace the low-voltage cable from the indoor Tempstar air handler to the outdoor condenser. Look for cuts, rodent damage, or splices that may have failed.
- 2. Verify terminal connections: At both indoor and outdoor control boards, ensure the communication terminals (often labeled C, D, 1, 2 or similar depending on model) are tight and wires are not crossed.
- 3. Check indoor board fuse: Confirm the low-voltage fuse is intact. Replace only with the same rating if blown, and investigate for shorts if it blows again.
- 4. Power cycle: Turn power back on, wait 5–10 minutes for boards to boot and re-establish communication, then call for cooling.
- 5. If E5 remains: The outdoor control board or indoor board may be defective. Board replacement and configuration should be done by a Tempstar-trained technician.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Control Board
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