Freezer
F7
The F7 error code on a Bosch freezer indicates a fault with the freezer’s temperature sensor (NTC sensor), meaning the appliance cannot accurately read its internal temperature. It’s a moderately serious fault — your freezer may struggle to maintain safe temperatures, so act promptly.
What does this error mean?
F7 signals that the NTC (Negative Temperature Coefficient) temperature sensor in the freezer compartment is sending an incorrect reading, or no reading at all, to the control board. This means the freezer’s electronics can’t regulate cooling properly. In some Bosch models, F7 can also indicate the sensor circuit is open or short-circuited, which will cause the compressor to run erratically or not at all.
Est. repair cost
£10–£25 DIY sensor replacement; £80–£150 professional repair (sensor); £150–£300 professional repair (PCB)
🔍 Likely causes
🛠️ Step-by-step fix
Reset the freezer first: unplug it from the mains, wait 10 minutes, then plug it back in. If F7 clears and doesn’t return within 24 hours, the fault was likely a temporary sensor spike or power glitch.
Check the freezer door seal and confirm the door has been fully closed. A poor seal lets warm air flood the compartment, pushing sensor readings out of range and triggering F7.
Defrost the freezer manually if you notice heavy ice build-up: turn it off, remove all food, and allow the interior to thaw fully (place towels on the floor). Ice encasing the sensor is a straightforward fix.
Inspect the NTC sensor and its wiring: it’s typically a small probe clipped to the inner wall or evaporator. Look for obvious damage — a cracked probe, a disconnected plug, or a visibly broken wire. Reconnect any loose connectors firmly.
Test the NTC sensor resistance with a multimeter (set to Ohms). At 0°C, a healthy Bosch NTC sensor reads approximately 5,000–6,000 Ω. A reading of zero (short circuit) or infinite (open circuit) confirms a failed sensor — replacements cost £10–£25 online and clip in without tools on most models.
If the sensor tests fine but F7 persists after a reset, the main control board is likely at fault. Do not attempt to repair the PCB yourself — arrange a professional diagnosis at this point.
📞 When to call a professional
Call an appliance engineer if F7 returns after a reset and defrost, or if your multimeter confirms the sensor is healthy (ruling out a simple part swap). Tell the engineer: ‘My Bosch freezer is showing error code F7 — I’ve reset it and manually defrosted it, but the fault persists, and the NTC sensor tests within range.’ This saves diagnostic time and reduces your call-out cost.
⚖️ Repair or replace?
A professional repair for F7 typically costs £80–£150 in the UK, covering call-out, diagnosis, and an NTC sensor replacement; a PCB replacement pushes this to £150–£300. If your Bosch freezer is under 8 years old, repair is almost always worthwhile. Beyond 10 years, compare the repair quote against a new mid-range freestanding Bosch freezer (£350–£600) — replacement makes more financial sense if the PCB is the culprit.