Microwave display shows H0 or HO; unit may not heat or may be in a demo/hold mode.

Safety: No internal repair is needed for this condition.

Steps to exit demo/hold mode (typical LG procedure, may vary by model):

• Press and hold the STOP/CLEAR button for 3–5 seconds until the display changes, or
• Press and hold 0 or START/ENTER for several seconds (check your user manual for the exact key combination).
• Once H0 disappears, set the clock and test a short cook cycle with a cup of water.

If you cannot exit H0, consult the specific LG model manual or LG support for the correct demo mode cancellation steps.