Miele Oven H0 Error Code: Causes and Fixes
Quick answer: Heating relay check failed
What you’ll notice
Heating relay self-test failed; oven may not heat.
Miele
Oven
Code H0
low severity
Miele models: Miele ovens hide the bake element beneath a removable oven floor — lift the floor out for cleaning. The RTD temperature probe is at the rear cavity wall. The MasterChef automatic programmes use a separate wired meat probe (sold as an accessory) — do not confuse this probe connector with the RTD fault sensor.
Common causes
- Relay on the control board stuck open or closed
- Heater element disconnected
Step-by-step fix
- Power cycle.
- If the oven heats but H0 persists, the relay's self-test logic has a fault.
- If the oven does not heat, test the bake and broil elements for continuity.
Tools you may need
Multimeter
Prevention
- Use a surge protector.
When to stop DIY
A relay failure on the control board requires board replacement.
FAQ
What does H0 mean on Miele oven?
H0 usually indicates: Heating relay check failed.
Can I keep using the appliance with H0?
Use caution. Severity is low. A relay failure on the control board requires board replacement.
How long does this fix usually take?
Typical first-pass troubleshooting takes 15–30 minutes.