Microwave Diagnostics

Thermador Microwave
Error Codes

Meanings, severity levels, safe checks you can perform, and when to call a technician.

Enter the code shown on your microwave display

Is it safe to keep using it?

Depends on code severity. Low/Medium codes often allow continued use, High severity requires immediate stop.

Can error codes be reset?

Some codes clear after power cycle. Persistent codes indicate underlying issues needing repair.

When should I stop using it?

Stop immediately for water leak codes, burning smell, or any High severity error.

Most Common Codes

E1007 E1006 ER1 ER4 ER11 ER18 H95 PF E17 E1003

All Codes

E17 E1003 E1006 E1007 ER1 ER4 ER11 ER18 H95 PF

Error Code Directory

Click any code for detailed troubleshooting steps

Low Medium High

Code Meaning Severity Common Symptom

E17 Speed Oven Preheat Failed Medium The unit begins preheating for a convection or combination cook program, runs the heating element for the full preheat period, then displays E17 and cancels because the target temperature was not confirmed by the cavity sensor. View E1003 Inverter Communication Fault High The unit energizes, the turntable begins to rotate, but within 3 to 10 seconds the magnetron cuts out and the display locks on E1003 -- the inverter board failed to send a feedback pulse back to the control. View E1006 Sensor Communication Error High The unit begins a cycle, heats for 20 to 60 seconds, then stops and displays E1006, refusing to continue. View E1007 Control Board Fault High The unit is heating normally when it abruptly cuts power to the cavity and freezes the display on E1007, refusing further operation. View ER1 Temperature Sensor Fault High Any program that uses the built-in sensor — auto-defrost, auto-reheat, or combination cooking on Thermador speed ovens — immediately displays Er1 and cancels. View ER4 Extreme Overheat Detected High The unit cuts power to the magnetron mid-cycle, the display freezes on Er4, and the door cannot be opened immediately while the unit cools. View ER11 Button Jam / Touchpad Fault Medium Pressing a button either does nothing or activates an unintended function, while the display shows Er11 persistently. View ER18 General Technical Fault Medium Immediately after power is restored, the unit shows Er18 and ignores all touchpad input. View H95 Door Not Closed Properly Medium The unit refuses to begin any cooking program and instead shows H95, indicating it cannot confirm the door is fully latched. View PF Power Failure Low The microwave display shows PF (Power Failure) when power is restored after an outage, a tripped circuit breaker, or a brief brownout in the home electrical supply. View

Thermador MicrowaveError Codes