Samsung Oven Error Code C-42

C-42 indicates that the steam sensor circuit is reading as shorted while the oven is in steam mode. The control board has detected an abnormal signal from the sensor and triggered this fault code. It typically points to a loose connector, a corroded wiring connection, or a failed steam sensor. In some cases, the main PCB can also be responsible.

It is not recommended to continue using the steam function while the C-42 fault is active. The error indicates the steam sensor is not functioning correctly, which means the oven cannot properly monitor the steam cycle. Running the appliance in this condition could result in improper cooking performance or potential overheating of the steam system.

Repair costs depend on which component has failed. If the issue is simply a loose connector, there is no parts cost, though a service call from a technician typically runs between $75 and $150 for the visit. A replacement steam sensor generally costs between $30 and $80 for the part, plus labor if professionally installed. A main PCB replacement is the most expensive outcome, with parts ranging from $150 to $350 or more depending on the model.

Some causes of C-42 are straightforward to address without professional help, such as reseating a loose connector at the PCB or sensor. Check both connectors carefully for secure seating and visible corrosion before assuming a part has failed. If connectors are secure and the error persists, replacing the steam sensor is the next step, which is a more involved repair that requires sourcing the correct part and safely accessing internal components.

A power reset by unplugging the oven or turning off the circuit breaker for a few minutes may temporarily clear the code, but it will return if the underlying fault is not corrected. The C-42 code is triggered by an active shorted condition in the steam sensor circuit, so the root cause must be resolved. Check connectors and replace the sensor if needed to permanently clear the fault.