PC 12 error code

What triggers it

Outdoor main control board DC bus low voltage protection / 341 MCE error from the voltage detection circuit.

What to do

1. Check the power supply; if it is not working, turn off the unit.
2. Check power-supply connections and wires; correct connections or replace wires if needed.
3. Power on and measure P-N voltage where applicable.
4. Replace the IPM board if P-N voltage is abnormal.
5. Check the reactor; replace the reactor if it is not normal, otherwise replace the outdoor PCB.

Which systems show it

• MRCOOL DIY 5th Generation single-zone 9k, 12k, 18k, 24k, and 36k D25 indoor/outdoor models listed in manual section 1.1.

Related codes

Technician scope

Technician-tier outdoor auxiliary board diagnostic; see service manual section 4.3

Source

Next step