What ER1 Means
ER1 indicates a faulty temperature sensor, causing convection cooking to fail to maintain the set temperature accurately.
Common Causes of ER1
- Failed or drifting temperature sensor
- Damaged sensor wiring
- Control board signal fault
🔧 One Safe Check You Can Try
There's no safe at-home test — sensor circuit testing requires a de-energized unit and technician tools.
⚠ Why You Shouldn't Go Further Than That
- Testing the temperature sensor circuit requires the unit to be fully de-energized — skipping that step near the magnetron area is a real shock risk.
- This fault affects convection cooking specifically; misdiagnosing it as a full magnetron failure leads to an unnecessary, expensive repair.
- The sensor sits close to high-voltage convection heating components, making DIY access riskier than it looks.
- A sensor reinstalled slightly out of position can continue reading inaccurately even after the part is replaced.
- Housing access to reach the sensor typically voids the remaining warranty.
Still Seeing ER1?
Book a factory-trained technician and get it diagnosed correctly the first time — no guesswork, no repeat visits.