What F7 Means
F7 is a relay board fault — the board that switches high-voltage power to the magnetron and other components isn't operating as commanded.
Common Causes of F7
- Relay board has failed
- A relay is stuck in the wrong position (on or off)
- Control board signal to the relay board has failed
🔧 One Safe Check You Can Try
There's no safe DIY step — the relay board sits in the same high-voltage section as the magnetron circuit.
⚠ Why You Shouldn't Go Further Than That
- This is the same high-voltage section covered by the magnetron thermal-cutoff warning — not a safe area for DIY access even unplugged.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.