The short version
F1 E6 means the microwave thermistor or sensor and its wiring stopped answering with a value the control treats as plausible. Before anything is replaced, a plug that backed out of its housing behind the rear panel accounts for a large share of these, and it is free to eliminate.
What this code is documented as meaning
Reference| Code | Documented meaning |
|---|---|
| F1 E6 | There may be a problem with the Microwave Thermistor or Sensor, or the associated wiring. |
What an owner observes
- The code appears and the cycle stops heating — Everything else looks normal — lights, fan, display — and only the heat is missing.
- The fault follows the weather or the time of day — A cold kitchen and a hot one put a marginal probe on opposite sides of its limit, which is why some of these arrive seasonally.
- NEAR MISS - nothing heats and no code shows at all — That is a power or element fault rather than a reading fault, and it belongs on the page for that symptom.
What triggers this code, most likely first
- A loose or corroded connector at the thermistor — Ranked first because it is the failure that needs no part: the probe is fine, the joint carrying its signal is not, and heat cycling at the back of the cavity is what works a pin loose.
- Microwave thermistor or sensor out of tolerance — Second: the element itself drifts or opens with age, and once it reads outside the accepted band the control has nothing to work from.
The cheapest checks first
- Follow the harness for rub marks where it crosses metal — A witness mark tells you the fault is in the wire, not in the part at either end.
- Compare what the appliance claims against a separate thermometer — Ten minutes with an oven thermometer separates a drifting probe from a control that is being told the truth.
The owner-safe sequence
- Clear the code with a full power-down — A code that does not return was a single bad read.
About 5 min
- Let the cavity reach room temperature before anything else — A hot resistance reading means nothing, and a hot cavity is the reason half of these codes cannot be diagnosed on the spot.
About 45 min
- STOP HERE if the next step is a meter across the probe terminals — That means a panel off and a connector back-probed, which is where an owner check ends and a service call begins.
Before you open anything
Safety
A microwave power circuit is not an owner repair at any level of experience: its capacitor stores a lethal charge after the appliance is unplugged, and discharging it safely is a trained procedure with a specific tool. Unplug the appliance or switch off its breaker before any panel comes off, and then stop - the cabinet stays shut.
The point at which you call
Call once the code survives a full power-down: a repeatable reading fault is a probe, a harness or a board, and telling those three apart needs a meter and the resistance table for that model line. There is one case that does not wait for any of that.
Codes next to this one
Which model lines this reading applies to
This page is the appliance-class reading of one code, for the model lines that use this probe on this cavity. If your model has a page of its own it is the more specific answer and is linked from the code index below; use this page as the general orientation.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
