Plain-language guidance for Miele code F4 Heater bank temperature sensor open-circuited on Washer — symptoms, safe checks, and when to call a technician.
Written by
Maya Chen Appliance Repair Content SpecialistPublished October 20, 2026
Content statusVerified
Error codeF4 Heater bank temperature sensor open-circuited
ApplianceWasher
Quick answer
F4 on a Miele washer or washer-dryer means the heater bank temperature sensor is open-circuited. It is a technical fault the owner cannot remedy.
Model compatibility
Miele reuses codes across series and model years, so F4 Heater bank temperature sensor open-circuited may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What thiscode means
Heater bank temperature sensor open-circuited.
F4 on a Miele washing machine or washer-dryer display means the heater bank temperature sensor is open-circuited. Miele lists it as a technical fault.
What the owner can do
Nothing at home will clear it, because the fault is one you cannot remedy yourself. Miele asks you to book a repair appointment online.
Similar-looking codes that are not the same fault:
F41: an electronic module fault, also shown as a technical fault
Los Angeles owners with F4 on the display can reach Miele washer service at (310) 742-0025. Have the code, the model number and a note of anything already tried ready when you call.
Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Get started
Seeing this code on your Miele appliance?
Book an on-site visit in Los Angeles County or Orange County. We diagnose the appliance that is showing the code and give a written estimate before any repair.
Tell us about your Miele —we’ll take it from there
Request a repair visit for a Miele appliance in Los Angeles County or Orange County. Share the model and symptom — or call and we will take the details.
