Carrier H5 Error Code

What does Carrier H5 mean?

Carrier's IPM (intelligent power module) protection has engaged. The manual lists the causes as IPM module over-temperature, low voltage, or a silica grease problem. The power module drives the compressor, so the control shuts the system down to protect it when the module reports a fault condition.

Symptoms

• H5 shown on the indoor unit display
• Compressor will not run
• Code can follow voltage problems or overheating
• Fault tied to the outdoor power module

Common causes

• IPM module over-temperature
• Low supply voltage
• Silica (thermal) grease problem on the module
• Inadequate heat transfer from the power module

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Diagnostic steps

1. Confirm the H5 code

   Verify H5 on the indoor unit display, which reports faults for both units.

2. Check supply voltage

   Since low voltage is a listed cause, confirm the incoming voltage is adequate.

3. Check module temperature and mounting

   Per the manual, consider IPM over-temperature and the silica grease interface on the module.

4. Correct the cause and retest

   Address voltage, cooling, or thermal-grease issues, then confirm H5 clears.

When to call a professional

The intelligent power module is a high-voltage inverter component, and faults involving over-temperature, voltage, and thermal grease should be diagnosed by a licensed HVAC technician. Working on the inverter board carries shock risk and requires correct thermal-interface handling. Have a qualified professional confirm the IPM diagnosis and perform any module or board service.