Home Product SupportIdentify a code

Smart home · HVAC configuration

Smart thermostat runs heat when cooling is selected

Opposite operation can come from heat-pump reversing-valve configuration, mislabeled wiring or equipment fault. Turn the system off; repeated testing can heat or damage the home.

Direct answer

Opposite operation can come from heat-pump reversing-valve configuration, mislabeled wiring or equipment fault. Turn the system off; repeated testing can heat or damage the home.

What this covers

  • The observed symptom matches this record
  • Customer-accessible settings, connections and external components
  • Diagnosis before reset, deletion or component replacement

What it does not cover

  • ×A model-specific error code with a different documented meaning
  • ×Internal electrical, battery-cell, gas, refrigeration or sealed-component repair
  • ×A guarantee that every model exposes the same control label
Try in this order0 of 4 completed

  1. Capture the exact symptom

    Reversible

    Record thermostat equipment type, wire labels/photo and whether outdoor unit and indoor air behave opposite the selected mode.

  2. Run the smallest isolation test

    Reversible

    Use the thermostat’s supported equipment configuration check without moving wires; compare installer documentation.

  3. Correct only the proven cause

    Reversible

    Have a qualified HVAC technician correct O/B configuration or wiring if the original installation record is uncertain.

  4. Verify before changing anything else

    Reversible

    Run a brief supervised cool call and verify supply temperature moves in the correct direction.

Evidence ledger

Sources behind this answer

Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.

01
ecobee SupportThermostat support

Official ecobee installation, HVAC, sensor, schedule and connectivity support.

Exact questions

Common follow-ups

What should I check before resetting anything?+

Record thermostat equipment type, wire labels/photo and whether outdoor unit and indoor air behave opposite the selected mode.

What is the safest isolation test?+

Use the thermostat’s supported equipment configuration check without moving wires; compare installer documentation.

When should I stop troubleshooting?+

Stop immediately for electrical odor, tripped breakers, freezing coils or extreme indoor temperatures.

Change recordAug. 17, 2026 — Published as an independently scoped question with a distinct isolation test, verification and safety boundary; source boundary: ecobee Support.
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