Bosch Oven Error Code E24 — How to Fix It

What Does This Error Mean?

Bosch oven E24 means the function selector switch or rotary control is sending an invalid signal to the control board. Try rotating the selector through all positions and back to Off — a sticky or partially engaged selector can cause E24. If the selector feels loose, gritty, or stiff, the switch mechanism has worn and needs replacing.

Affected Models

Bosch Series 2 Oven
Bosch Series 4 Oven
Bosch Series 6 Oven
Bosch Series 8 Oven
Bosch HBN Series
Bosch HBA Series

Common Causes

Rotary selector switch contacts worn with use and sending intermittent or invalid signals
Grease or moisture ingress behind the selector knob damaging the switch contacts
Selector knob pulled off and reattached incorrectly — shaft position misaligned
Control board input circuit for the selector has developed a fault
Oven cleaned with excessive water that entered the selector switch housing

How to Fix It

Turn the selector to each position and back to Off

Rotate the selector knob slowly through every function position, pausing for 2 seconds at each one, then turn back to Off. This can clear carbon deposits from switch contacts and resolve a false E24.
Remove and refit the selector knob

Pull the knob straight off its shaft. Check the shaft for bent or broken locating tabs. Refit the knob so it sits flat and aligned. A misaligned knob can force the switch into an invalid position.
Clean behind the knob

With the knob removed, use a dry cotton bud to clean around the shaft opening. Grease or steam from cooking enters behind the knob over time and degrades the switch contacts.
Reset the oven

Switch the oven off at the mains for 2 minutes, then switch back on. A transient E24 sometimes clears on power cycle — if it does not return, the fault was a one-off contact issue.
Replace the selector switch

If E24 persists, the selector switch assembly needs replacing. This involves removing the front fascia panel. Cost is typically $30–60 for the part. A repair technician can replace this in 30–45 minutes.

When to Call a Professional

Replacing the function selector switch requires removing the oven front control panel. If the oven is still under warranty, contact Bosch service before attempting a repair yourself.

Frequently Asked Questions

Can I reset Bosch oven E24?

E24 can sometimes be cleared by switching off at the mains for 2 minutes. However, if the selector switch contacts have worn, E24 will return — a reset is only a temporary fix.

Bosch oven E24 after cleaning — why?

Cleaning with spray cleaners or excess water can push moisture into the selector switch housing. Leave the oven door open for several hours to dry completely before switching it back on.

My Bosch oven shows E24 on start-up — is the control board faulty?

E24 on start-up suggests the selector is not returning a valid Off reading. Check the knob is correctly seated and in the Off position. If E24 appears with the knob in every position, the switch is faulty — not the control board.