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Error code reference

Electrolux Oven Error Code CSHt

Cavity SSR NTC overtemperature (NHSC)

Electrolux codesElectrolux oven codes

Cavity SSR NTC overtemperature (NHSC) - warning, activates at 85°C/Reset at 75°C. Dirty inlet air filter, cooling fan failure, or SSR internal issue.

First step from the service manual

Check room temperature; clean air intake filter; check cavity insulation; verify heat sink integrity; Check X41 on ACU.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What CSHt means on a Electrolux oven

The CSHt error code on an Electrolux oven indicates an overtemperature condition at the cavity Solid State Relay (SSR) heat sink, monitored by an NTC (Negative Temperature Coefficient) thermistor. This warning activates when the heat sink temperature reaches 85°C and resets once the temperature drops back to 75°C. The SSR is a critical switching component in the oven's power control circuit, and its heat sink must remain within safe operating temperatures to prevent component damage or failure. The NTC thermistor continuously reports heat sink temperature to the Appliance Control Unit (ACU), and when the threshold is crossed, the CSHt warning is triggered.

The most common causes of this condition are restricted airflow into the oven's cooling system or a failed cooling fan. The oven relies on a steady supply of ambient air to keep the SSR and associated electronics within safe temperature limits. A clogged or dirty inlet air filter will reduce airflow dramatically, causing heat to build up on the heat sink faster than it can dissipate. A cooling fan that has seized, lost speed, or failed entirely produces the same result. Elevated ambient room temperatures can also push the system closer to the threshold, making even minor airflow restrictions problematic.

Diagnosis begins with checking the room temperature and inspecting the air intake filter for dust or debris buildup, cleaning it as needed. Technicians should also inspect the cavity insulation for damage that could allow excess heat to transfer toward the SSR assembly, and physically verify the integrity of the heat sink itself for warping or poor thermal contact. Connector X41 on the ACU should be checked for secure seating and corrosion, as a poor connection can cause erroneous NTC readings or control issues. If airflow and mechanical components check out, the SSR itself may have an internal fault causing excess heat generation.

Source: manufacturer service documentation.

Common causes of CSHt

  1. 01

    Clogged or dirty inlet air filter

    Wiring / connection

    Dust and grease buildup on the air intake filter restricts airflow to the cooling system, causing heat to accumulate on the SSR heat sink. Inspect the filter visually and clean or replace it if blocked.

  2. 02

    Cooling fan failure

    Part replacement

    If the cooling fan has seized, slowed, or stopped running, the heat sink cannot dissipate heat effectively and temperatures will rise quickly. Listen for fan operation during use and check fan motor resistance and voltage supply if silent.

  3. 03

    High ambient room temperature

    Wiring / connection

    Elevated room temperatures reduce the cooling system's ability to keep the SSR within safe limits, especially if combined with minor airflow restrictions. Check whether the error occurs mainly on hot days or in poorly ventilated spaces.

  4. 04

    SSR internal fault

    Part replacement

    A failing or degraded SSR can generate excess internal heat even under normal operating conditions, pushing the heat sink above the 85°C threshold. If airflow and fan are confirmed good, the SSR should be tested or replaced.

  5. 05

    Loose or corroded X41 connector on ACU

    Wiring / connection

    A poor connection at the X41 connector on the Appliance Control Unit can cause inaccurate NTC thermistor readings or disrupt the control circuit. Inspect the connector for corrosion, bent pins, or loose seating and reseat firmly.

See the test procedure for each cause

Frequently asked questions about CSHt

What does CSHt mean on a Electrolux oven?
CSHt is a warning code indicating that the Solid State Relay (SSR) heat sink temperature has reached 85°C, which exceeds the safe operating threshold monitored by an NTC thermistor. The oven's Appliance Control Unit triggers this warning to protect the SSR from heat damage. The code will reset automatically once the heat sink cools back down to 75°C. Common causes include a dirty air intake filter, a failing cooling fan, or an internal SSR issue.
Can I fix the CSHt error on my Electrolux oven myself?
Some causes of CSHt are straightforward to address without professional help, particularly cleaning a blocked inlet air filter or improving ventilation around the oven. However, diagnosing a failed cooling fan, inspecting the X41 connector on the ACU, or replacing the SSR requires comfort working with appliance electronics and should be approached carefully. If you are not experienced with appliance repair, a qualified technician is the safer choice for anything beyond basic filter cleaning.
Is it safe to keep using my Electrolux oven when the CSHt code appears?
The CSHt code is a warning rather than a hard fault, meaning the oven detected an overtemperature condition but may still be operational. Continuing to use the oven without addressing the root cause risks damage to the SSR, which is a critical power control component. It is best to stop using the oven until the cause is identified and corrected to avoid a more serious and costly failure.
Will resetting my Electrolux oven clear the CSHt error code?
The CSHt warning will reset automatically once the SSR heat sink temperature drops back below 75°C, so a power cycle may temporarily clear the display. However, if the underlying cause such as a clogged filter or faulty cooling fan is not resolved, the code will return during the next use. A reset without repair is not a solution and could allow heat damage to occur over repeated cycles.
How much does it cost to repair a CSHt error on an Electrolux oven?
Repair costs vary depending on the root cause. Cleaning the inlet air filter costs nothing beyond time, while a professional diagnostic visit typically runs between $75 and $150. Replacing a cooling fan generally falls in the $150 to $300 range including parts and labor, and SSR replacement can range from $200 to $400 or more depending on the model and local labor rates.

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