Tosot IPM (Intelligent Power Module) Protection / Inverter Module Fault

Indoor unit shows H5, outdoor unit may not run

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.

Possible Causes

Shorted IPM on outdoor inverter board, Overheating of power module, Poor heat sink contact, DC bus overvoltage or undervoltage

Safety first: Only qualified technicians should service inverter electronics. Disconnect power and wait for capacitors to discharge.

Visual inspection: Check the inverter module and heat sink for burn marks or loose mounting.
Ensure ventilation: Make sure the outdoor control box is not blocked and that fans are working.
Power reset: After cooling and inspection, restore power and test.
If H5 returns: The inverter IPM module or entire outdoor PCB must be replaced.

Professional Required 5/5

Outdoor Inverter Power Module (IPM Board)

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