mypros+
Error code reference

Electrolux Oven Error Code bSHt

Boiler SSR NTC overtemperature (NHSB)

Electrolux codesElectrolux oven codes

Boiler SSR NTC overtemperature (NHSB) - 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 the air intake filter; check cavity insulation; verify heat sink integrity; Check X42 on ACU.

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

MyPros+ Max

Get the full diagnostic procedure for bSHt.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What bSHt means on a Electrolux oven

The bSHt error code on an Electrolux oven indicates a boiler Solid State Relay (SSR) NTC overtemperature condition. This is a warning-level fault specific to the NHSB (Natural Heat Steam Boiler) system. The NTC thermistor mounted on the SSR heat sink monitors temperature continuously. When that temperature reaches 85°C, the appliance control unit (ACU) triggers the bSHt warning and suspends normal operation to protect the relay from thermal damage. The fault resets automatically once the heat sink temperature drops back to 75°C.

The SSR is a critical switching component that controls power delivery to the boiler. Because it generates heat during normal operation, it depends on adequate airflow across its heat sink to stay within safe operating limits. If the inlet air filter becomes clogged with dust or debris, airflow is restricted and heat builds up rapidly around the SSR. Similarly, if the cooling fan fails or runs at reduced speed, the heat sink cannot dissipate thermal energy fast enough, causing the NTC sensor to register an overtemperature condition even under normal load.

Beyond airflow issues, cavity insulation degradation can allow excess heat to migrate toward the SSR assembly, and in some cases the SSR itself may have an internal fault causing it to generate excessive heat independent of ambient or airflow conditions. Connector X42 on the ACU is the primary interface point for the NTC sensor signal, so a loose or corroded connection at X42 can produce a false overtemperature reading. Diagnosis should begin with environmental checks, filter cleaning, and fan verification before suspecting component failure.

Source: manufacturer service documentation.

Common causes of bSHt

  1. 01

    Clogged inlet air filter

    Wiring / connection

    Dust and grease buildup in the air intake filter restricts airflow to the SSR heat sink, causing rapid heat accumulation. Inspect and clean the air intake filter as the first corrective step.

  2. 02

    Cooling fan failure or reduced speed

    Part replacement

    If the cooling fan is not spinning at full speed or has stopped, the SSR heat sink cannot shed heat adequately. Listen for fan operation during a cycle and check for obstruction or motor failure.

  3. 03

    Loose or corroded X42 connector on the ACU

    Wiring / connection

    The NTC sensor signal passes through connector X42 on the appliance control unit. A poor connection here can produce an inaccurate high-temperature reading, triggering the fault without a true overtemperature condition. Inspect and reseat the X42 connector.

  4. 04

    Degraded cavity insulation

    Part replacement

    Damaged or missing oven cavity insulation can allow excess heat to migrate toward the SSR assembly, raising the heat sink temperature above the 85°C threshold. Check insulation integrity around the boiler and SSR mounting area.

  5. 05

    SSR internal fault

    Part replacement

    If airflow, insulation, and wiring connections are all confirmed good, the SSR itself may have an internal defect causing it to generate excessive heat during switching. In this case the relay requires replacement.

See the test procedure for each cause

Frequently asked questions about bSHt

What does bSHt mean on a Electrolux oven?
The bSHt code indicates that the NTC thermistor on the boiler Solid State Relay heat sink has detected a temperature at or above 85°C, triggering an overtemperature warning. The oven protects itself by halting operation until the heat sink cools to 75°C. Common causes include a dirty air intake filter, a failed cooling fan, or a wiring issue at connector X42 on the control unit. In rarer cases, the SSR itself may have an internal fault.
Can I fix the bSHt error myself without calling a technician?
Some causes of bSHt are owner-serviceable. Cleaning the inlet air filter requires no special tools and should be the first step. Checking that the cooling fan spins freely and is not obstructed is also within reach for most DIYers. However, inspecting connector X42 on the ACU, testing the SSR, or replacing components involving electrical connections to the boiler system should be handled by a qualified technician.
Is it safe to keep using my oven when the bSHt code appears?
You should not continue operating the oven while this code is active. The warning exists specifically to prevent thermal damage to the SSR and surrounding components. Continued use with restricted airflow or a malfunctioning cooling fan could lead to component failure or create a safety hazard. Allow the oven to cool and address the root cause before resuming use.
Will resetting the oven clear the bSHt error code?
The bSHt fault is designed to reset automatically once the SSR heat sink temperature drops back to 75°C, so powering the oven off and allowing it to cool may temporarily clear the code. However, if the underlying cause is not corrected, such as a clogged filter or a failing fan, the error will return as soon as the oven reaches operating temperature again. A lasting fix requires identifying and resolving the root cause.
How much does it cost to repair a bSHt error on an Electrolux oven?
Repair costs depend on the cause. Cleaning the air filter costs nothing beyond your time. If the cooling fan needs replacement, expect to spend roughly $80 to $200 including parts and labor. An SSR replacement typically runs $150 to $350 depending on parts availability and labor rates in your area. Diagnostic service calls generally range from $75 to $150 before any parts are factored in.

Related Electrolux oven codes

All Electrolux oven codes
View all 186 Electrolux oven codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass