Unit shows P0 and may not start or may run at reduced capacity.

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

Low or high supply voltage, Faulty PFC (power factor correction) circuit on outdoor PCB, Loose AC input terminals, Power surge damage

Safety first: Switch off power at the breaker before checking terminals.

Steps to try:

Check supply voltage: Have a qualified person measure line voltage at the unit. It must be within the range specified on the Tristar nameplate.
Inspect terminals: Tighten any loose line and neutral connections at the outdoor unit’s terminal block.
Use surge protection: Install a suitable surge protector to prevent future damage.

When to call a technician: If P0 persists with correct supply voltage, the outdoor power board likely needs professional replacement.

Hard 4/5

Outdoor Power Supply PCB

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