Tumble Dryer
F09
The F09 error code on a Bosch tumble dryer signals a fault with the appliance’s electronic control board or an EEPROM memory error — it’s one of the more serious fault codes and often means the machine has stopped mid-cycle and won’t restart without intervention.
What does this error mean?
F09 indicates that the dryer’s main control board has detected a memory or communication error — specifically, a problem reading or writing to its EEPROM (the chip that stores settings and operating data). In plain terms, the dryer’s ‘brain’ has either lost its settings, suffered a power surge corruption, or developed a hardware fault on the control board itself. The machine locks out as a safety measure to prevent incorrect operation.
Est. repair cost
£120–£220 professional PCB repair; £60–£130 for the part alone if engineer-fitted
🔍 Likely causes
🛠️ Step-by-step fix
Perform a hard reset first: switch the dryer off at the wall socket, leave it unplugged for 10–15 minutes, then plug back in and try a fresh cycle. A firmware glitch will sometimes clear itself.
Check your home’s fuse box for any tripped breakers or blown fuses on the dryer’s circuit — a voltage irregularity can trigger F09 and trip the breaker simultaneously.
Inspect the door seal and lint filter area for any obvious moisture pooling near the control panel. Wipe dry and allow to air out before retrying.
If the error returns immediately after reset, check the wiring harness connectors at the back of the control panel (with the dryer unplugged). Gently reseat any loose plugs — do not open the main PCB housing.
If none of the above clears the fault, the control board (PCB) itself almost certainly needs replacing or re-flashing — this requires a professional engineer with Bosch diagnostic tools.
Do not attempt to solder or repair the PCB yourself — incorrect handling of the control board can cause irreversible damage and is not a safe DIY task.
📞 When to call a professional
If the F09 error persists after a full hard reset and basic connector check, call a qualified appliance engineer — tell them you have a Bosch tumble dryer showing fault code F09 and that you suspect a main control board or EEPROM fault. Avoid using the dryer until it has been assessed, as a malfunctioning control board can cause the machine to behave unpredictably.
⚖️ Repair or replace?
A PCB replacement on a Bosch tumble dryer typically costs £120–£220 including labour in the UK; the part alone is £60–£130 depending on the model. If your dryer is under 6 years old and otherwise in good condition, repair is worth it — Bosch machines are built to last 10–12 years. If it’s over 8 years old or has had previous electrical faults, replacement with a new mid-range condenser or heat pump dryer (£350–£600) is the more economical long-term choice.