Fridge
F7
The F7 error code on a Siemens fridge signals a fault with the internal temperature sensor, meaning the appliance can no longer reliably monitor or maintain the correct temperature — a problem that puts your food at risk if left unresolved.
What does this error mean?
F7 indicates that the fridge compartment’s NTC temperature sensor has sent a reading outside the expected range, or has stopped responding altogether. The fridge’s control board interprets this as a sensor failure and flags it to prevent the appliance from running blind on temperature. In most cases, the compressor will still run, but the fridge cannot confirm it’s cooling correctly.
Est. repair cost
£15–£35 DIY sensor replacement; £80–£180 professional repair including call-out
🔍 Likely causes
🛠️ Step-by-step fix
Reset the fridge: unplug it from the mains for 5 minutes, then plug it back in. If F7 clears and does not return, the fault was a temporary glitch.
Check the fridge compartment for excessive frost or ice build-up. If iced over, switch the fridge off and allow it to fully defrost for 24 hours with the door open, then restart — frost around the sensor can cause false readings.
Locate the temperature sensor (usually a small probe clipped to the back interior wall or near the evaporator). Inspect the wiring connector for visible damage, corrosion, or a loose fit. Gently reseat the connector if it appears dislodged.
If you have a multimeter, test the NTC sensor resistance at room temperature — a healthy NTC sensor typically reads around 10,000 ohms (10kΩ) at 25°C. A reading of zero or infinite resistance confirms sensor failure.
Order a compatible replacement NTC sensor for your specific Siemens model number (found on the rating plate inside the door). Replacement sensors cost £15–£35 online. Swap the sensor by unplugging the old one and clipping the new one into place — no specialist tools needed.
If F7 returns after a new sensor is fitted, do not attempt to replace the control board yourself. Stop here and call a qualified appliance engineer.
📞 When to call a professional
Call an appliance engineer if the error persists after a full defrost and sensor replacement, as the fault is likely a main control board issue that requires specialist diagnosis and soldering or board replacement. When booking, tell the engineer you have a Siemens fridge showing error code F7, that you’ve already tested or replaced the NTC temperature sensor, and that the fault persists. This saves diagnostic time and may reduce your call-out cost.
⚖️ Repair or replace?
A professional repair for an F7 fault — including call-out and either a sensor replacement or control board repair — typically costs £80–£180 in the UK. If your Siemens fridge is under 8 years old and was a mid-to-high-range model (original cost £500+), repair is almost always worth it. If the fridge is over 10 years old or the repair quote exceeds £200, replacement is the more economical choice.