Electrolux Professional BSOt

What does Electrolux Professional BSOt mean?

BSOt means the SkyLine oven's boiler SSR NTC (NTC4) has detected an over-temperature at the boiler solid-state relay. The boiler stops and cooking and cleaning are blocked, but the oven can keep working in a recovery mode where cycles do not use the boiler. Like the cavity SSR alarm, it is usually a cooling-airflow problem rather than the boiler itself.

Symptoms

• BSOt displayed
• Boiler stops; cooking and cleaning blocked
• Recovery mode runs cycles without the boiler
• Often follows a dirty inlet air filter

Common causes

• Inlet air filter dirty
• Cooling fan failure
• Cooling inlet drawing warm or hot air
• Oven installed beside a hot appliance
• Steam or heat leakage into the electronic compartment

Diagnostic steps

1. 01

   Do not switch the oven off

   Keep the oven on and wait for the temperature to decrease.

2. 02

   Clean the inlet air filter

   Clean the inlet air filter to restore cooling airflow to the SSR.

3. 03

   Check the cooling airflow

   Use a thin strip of paper at the cooling air inlet to confirm air flow; if none, call Service.

4. 04

   Check surrounding heat

   Check whether inlet cooling air is affected by heat from nearby hot appliances.

5. 05

   Call Service if it persists

   If the error persists, call Service.

When to call a professional

Clean the filter and verify cooling airflow first. Call an Electrolux Professional engineer if no airflow is detected, the cooling fan looks failed, or BSOt persists. A failed cooling fan or steam leakage into the electronic compartment is an internal repair. Continued over-temperature at the boiler solid-state relay can damage the electronics, so professional service is warranted once basic airflow checks fail.