LG · Inverter heat pump (2020 manual)
LG Inverter heat pump (2020 manual) error code 27
What it means
PSC Fault.
How it shows: The heater switches to: Use Elements Only
Source: LG Heat Pump Water Heater Owner's Manual, MFL71409201 Rev.01, page 33
What LG says to do
Call our Technical Support Center.
Last checked 2026-10-03.
Safety first
- WARNING: Turn off the power by opening the circuit breaker or removing the fuses before you perform any maintenance; otherwise it may cause electrical shock resulting in severe injury or death. (pg. 26)
- DANGER: Before manually operating the relief valve, make sure it will discharge in a safe place. If water does not flow freely from the end of the discharge pipe, turn off the power to the water heater and call a qualified person. (pg. 28)
From the manufacturer's manual for this series.