Wolf Oven Error Code RM Ambient Thermistor shorted error

The RM Ambient Thermistor Shorted error indicates that the ambient temperature thermistor located within the Relay Module (RM) is returning a shorted circuit reading. A thermistor is a resistive temperature sensor that changes its resistance value in response to temperature. When the thermistor shorts, it presents near-zero resistance to the control board, which the system interprets as an impossibly high temperature reading or a failed sensor circuit. The Relay Module uses this ambient thermistor to monitor the internal thermal environment of the module itself, helping protect relay components from heat-related damage during oven operation.

A shorted thermistor typically results from physical damage to the sensor element, degraded insulation on the thermistor leads causing a direct short to ground, or an internal failure within the thermistor component itself. Connector corrosion or heat-damaged wiring between the thermistor and the Relay Module's control circuit can also create a low-resistance path that mimics a short condition. Because the Relay Module contains both the thermistor and the relay switching components in a single assembly, the thermistor is not typically a separately replaceable part.

Diagnosis begins with a thorough inspection of all wiring connections leading to and within the Relay Module. Loose, corroded, or heat-stressed connectors should be reseated or cleaned. If connections are intact and the error persists, the Relay Module itself must be replaced, as the thermistor is integral to the module assembly. This error is specific to the oven indicated in multi-unit configurations, so technicians should confirm which oven cavity is generating the fault before proceeding.