Miele Dishwasher F02 — What It Means & How to Fix It
F02 is F01's twin on the same sensor: the water-temperature sensor circuit reads open, so the heater stands down and a cycle can finish cold and unwashed.
What this code means
Where F01 is a short circuit, F02 is an open circuit — the control module can't see the NTC temperature sensor at all. Miele stops heating once F02 registers, and a program may complete without a proper hot wash. The classic failure is the sensor itself opening up as it warms (it can test fine when cold and fail partway through a cycle), a connector that has worked loose, or a break in the wiring. The honest owner step is a reset and a connector glance; the rest is panel-and-multimeter work.
Described as F02 on Miele G-series dishwashers (a G 4225 owner thread confirms F02 = temperature sensor open circuit); some generations fold the sensor pair into F1/F2, so check your manual's fault list.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| NTC water-temperature sensor fails open — often only once warm | Occasional | No — technician job |
| Connector to the sensor unseated or corroded | Less common | Limited — visual check |
| Broken wire in the sensor harness | Less common | No — technician job |
What you can try yourself
- Unplug the dishwasher, wait five minutes, plug back in and run a short program to rule out a transient reading.
- If F02 returns, check that the fixings behind the lower panels haven't been disturbed — but do not open the machine if you're not comfortable.
- A sensor that tests fine cold but fails warm is the classic F02 story, so a clean reading at rest isn't proof the fault is gone.
- Book a Miele-trained technician; the sensor and harness are behind the panelling and need proper testing.
When to call a technician
- F02 appears again on the very next cycle after a reset.
- The machine stops mid-program and won't restart.
- Any signs of water contact near the sensor wiring — unplug before doing anything.
Typical professional repair cost: About $150–350 for a technician visit; the sensor part is cheap but reaching it costs labor.
Frequently asked questions
Is F02 the same as F01?
Same sensor, opposite failure: F01 is a short circuit, F02 an open circuit. Both disable heating and both end at the technician unless a reset clears them.
My G 4225 shows F02 and I read the resistance checks out — why?
This is the classic trap: the sensor often fails open only when warm. It can test fine cold and throw F02 partway through heating, so a spot check doesn't clear it.
Sources checked
Error meanings can vary by model. This guide was checked against the documentation above; use the manual for the model number on your own appliance when it differs.
Related Miele codes
- Miele Dishwasher F01 F01 is the dishwasher telling you its water-temperature sensor is short-circuited — the machine will stop heating so nothing comes out properly cleaned until it's sorted.
- Miele Dishwasher F11 F11 means the wash cabinet isn't draining — usually a mis-seated non-return valve, a blocked drain pump or clogged filters, and Miele USA walks owners through fixing it.
- Miele Dishwasher F12 F12 means the dishwasher isn't taking in enough water, and Miele's own support page gives the three owner checks: faucet on, clean the inlet filter, straighten the hose.
- Miele Dishwasher F14 F14 means the dishwasher's circulation pump is blocked — Miele says a pump left unused for weeks or months can dry out and stick, and gives a hot-water soak as the first fix.
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