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Error code reference

Dacor Range Oven Cooktop Error Code C35

Heritage: Relay board ambient temp probe shorted

Dacor codesDacor range oven cooktop codes

Heritage: Relay board ambient temp probe shorted - shorted thermistor detected.

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What C35 means on a Dacor range oven cooktop

The C35 error code on Dacor Heritage series ranges and ovens indicates that the relay board's ambient temperature probe has been detected in a shorted condition. The ambient temperature thermistor on the relay board monitors the internal temperature of the control cavity, helping the system protect sensitive electronics from overheating. When the control detects a short circuit in this thermistor circuit, it triggers C35 to alert the technician that the sensor is no longer providing a valid resistance reading. A shorted thermistor will typically read near zero ohms rather than the expected resistance value, which causes the control board to interpret the probe as failed.

The thermistor itself is the most common point of failure in this fault. Thermistors can short internally due to heat stress, moisture intrusion, or manufacturing defects. The wiring harness connecting the ambient probe to the relay board is also a potential source of the fault, as damaged insulation or pinched wires can create a short to ground or to an adjacent conductor. In some cases, the relay board itself may have a failed input circuit that misreads the probe as shorted even when the probe tests within specification.

Diagnosing this fault requires disconnecting the ambient temperature probe from the relay board and measuring its resistance directly with a multimeter. A shorted probe will read at or near zero ohms. If the probe reads within the normal thermistor resistance range for the ambient temperature of the unit, the fault likely resides in the wiring harness or the relay board input circuit itself. Replacing the faulty component is required to clear the error and restore normal operation.

Source: manufacturer service documentation.

Common causes of C35

  1. 01

    Failed ambient temperature thermistor

    Part replacement

    The thermistor on the relay board has shorted internally, producing a near-zero ohm reading instead of the expected resistance value. This is the most common cause and is confirmed by measuring the thermistor's resistance directly after disconnecting it from the board.

  2. 02

    Damaged wiring harness

    Part replacement

    The wiring between the ambient probe and the relay board may have pinched, burned, or frayed insulation that creates a short circuit. Visually inspect the harness routing for any signs of heat damage, chafing, or contact with sharp edges.

  3. 03

    Moisture or contamination on the relay board

    Wiring / connection

    Grease, moisture, or debris on the relay board near the thermistor input circuit can create a low-resistance path that mimics a shorted probe. Inspect the board for visible contamination or corrosion around the thermistor connector pins.

  4. 04

    Failed relay board input circuit

    Part replacement

    If the ambient thermistor and its wiring both test normal, the relay board's own input circuitry for the probe may have failed. In this case, the relay board itself requires replacement.

See the test procedure for each cause

Frequently asked questions about C35

What does C35 mean on a Dacor range, oven, cooktop?
C35 on a Dacor Heritage appliance means the relay board's ambient temperature probe has been detected as shorted. The ambient thermistor monitors the temperature inside the electronics compartment, and a short condition means it is reading near zero ohms rather than a valid resistance. This fault requires inspection of the thermistor, its wiring, and the relay board.
Can I fix the C35 error myself?
A knowledgeable DIYer comfortable working with appliance electronics can attempt to diagnose C35 by disconnecting the ambient probe and testing its resistance with a multimeter. If the thermistor reads near zero ohms, it has shorted and needs replacement. However, accessing the relay board and its components typically requires disassembling the oven control cavity, so comfort with appliance disassembly is important before attempting this repair.
Is it safe to use my Dacor oven while the C35 error is displayed?
Operating the oven with an active C35 fault is not recommended. The ambient thermistor protects the relay board and control electronics from overheating, and with it shorted, that protection is compromised. Continued use risks damage to the relay board or other control components, which could turn a relatively simple repair into a more costly one.
Will resetting the oven clear the C35 error code?
Resetting the oven by cycling power may temporarily clear the C35 display, but the error will return if the underlying fault in the thermistor or wiring is still present. A reset does not repair a shorted thermistor. A permanent fix requires identifying and replacing the faulty component.
How much does it cost to repair a C35 error on a Dacor oven?
Repair costs depend on which component has failed. If only the ambient thermistor or its wiring harness needs replacement, parts and labor typically range from around $100 to $250. If the relay board itself requires replacement, costs can range from $250 to $500 or more depending on part availability and labor rates in your area.

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