What C34 Means
C34 means the thermistor on the relay board reads open. On Renaissance EOR/MOR wall ovens the relay board has its own temperature sensor, separate from the control board’s, and C34 is its open-circuit code.
Common Causes of C34
- Relay board thermistor failed open
- Relay board connector loose
🔧 One Safe Check You Can Try
One breaker reset is reasonable. If C34 returns, stop there.
⚠ Why You Shouldn't Go Further Than That
- The relay board is mounted inside the oven chassis with live element connections nearby.
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.