mypros+
Error code reference

Kenmore Oven Error Code F44

The microwave external cooling fan speed (as read by the tachometer input of the Appliance Control Board) is…

Kenmore codesKenmore oven codes

The microwave external cooling fan speed (as read by the tachometer input of the Appliance Control Board) is abnormally high.

First step from the service manual

Visually inspect the microwave external cooling fan. Verify there is nothing blocking the air flow. Check the 120VAC voltage on the fan; a voltage higher than 120VAC + 10% could make it go too fast.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

MyPros+ Max

Get the full diagnostic procedure for F44.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What F44 means on a Kenmore oven

The F44 error code on a Kenmore oven indicates that the Appliance Control Board has detected an abnormally high rotational speed from the microwave external cooling fan. The control board monitors fan speed using a tachometer input, which reads pulses generated by the fan motor as it spins. When the tachometer signal indicates a speed exceeding the normal operating range, the board triggers this fault code to alert the technician to an out-of-spec condition in the cooling system.

The microwave external cooling fan is responsible for dissipating heat generated during microwave operation. Under normal conditions, the fan runs at a predictable speed tied to the 120VAC supply voltage. If the supply voltage rises above the acceptable threshold of approximately 132VAC (120VAC plus 10%), the fan motor will spin faster than designed, causing the tachometer reading to exceed normal limits. Overvoltage conditions like this can originate from issues with the home's electrical supply, a faulty outlet, or wiring problems within the appliance itself.

A secondary failure path involves the Appliance Control Board itself. If the tachometer input circuit on the board is malfunctioning, it may misread normal fan speeds as excessive, generating a false F44 fault. The diagnostic process should therefore begin with a visual inspection of the fan for airflow obstructions, followed by measuring the actual supply voltage at the fan to confirm it falls within the acceptable 120VAC range before suspecting a board-level fault.

Source: manufacturer service documentation.

Common causes of F44

  1. 01

    Excessive supply voltage to the fan

    Wiring / connection

    If the voltage supplied to the microwave external cooling fan exceeds 132VAC (120VAC plus 10%), the fan motor will spin faster than its rated speed and trigger the F44 fault. Measure the AC voltage at the fan with a multimeter while the appliance is operating to confirm this condition.

  2. 02

    Home electrical supply overvoltage

    Wiring / connection

    An overvoltage condition at the home's electrical panel or wall outlet can push line voltage above the safe operating range for the fan. Check the outlet voltage with a multimeter and consult an electrician if it consistently reads above 132VAC.

  3. 03

    Faulty Appliance Control Board tachometer input

    Part replacement

    If the tachometer input circuit on the Appliance Control Board is defective, it may report an abnormally high fan speed even when the fan is operating normally. This is suspected when voltage and fan inspection reveal no issues, and replacing the board resolves the fault.

  4. 04

    Airflow restriction causing motor compensation

    Wiring / connection

    Although F44 indicates high speed rather than low speed, a partial blockage that disrupts airflow around the fan assembly can cause irregular motor behavior. Visually inspect the fan and surrounding vents to confirm nothing is obstructing airflow.

  5. 05

    Damaged or failing fan motor

    Part replacement

    A fan motor with a damaged winding or failed speed-regulation component can run at uncontrolled speeds even under normal voltage conditions. If voltage checks out and the board is functioning correctly, the fan motor itself may need replacement.

See the test procedure for each cause

Frequently asked questions about F44

What does F44 mean on a Kenmore oven?
F44 indicates that the Appliance Control Board has detected an abnormally high speed from the microwave external cooling fan, as measured by the board's tachometer input. The most common cause is a supply voltage to the fan that exceeds 120VAC by more than 10%. The code can also point to a fault in the control board's tachometer circuit if voltage levels check out as normal.
Can I fix the F44 error on my Kenmore oven myself?
Some basic diagnostic steps are within reach for a knowledgeable DIYer, including visually inspecting the fan for obstructions and checking that nothing is blocking airflow around the fan assembly. However, measuring live 120VAC circuit voltage and diagnosing or replacing the Appliance Control Board involve working with line voltage, which carries a risk of serious injury if proper precautions are not taken. A qualified appliance technician is recommended for any steps involving electrical measurement or component replacement.
Is it safe to use my Kenmore oven while the F44 code is showing?
Continued use is not recommended until the cause of F44 is identified. An overvoltage condition affecting the cooling fan could indicate a broader electrical supply problem that may damage other components or create a safety hazard. It is best to stop using the appliance and have it inspected before resuming operation.
Will resetting my Kenmore oven clear the F44 error code?
A reset may temporarily clear the F44 code, but if the underlying cause such as overvoltage or a faulty control board is still present, the fault will return during the next use. Clearing the code without addressing the root cause does not fix the problem and could allow a potentially damaging condition to persist.
How much does it cost to repair a Kenmore oven F44 error?
Repair costs vary depending on the root cause. If the issue is an overvoltage condition requiring an electrician, electrical service fees typically range from $100 to $300 or more. If the Appliance Control Board needs replacement, parts and labor combined can range from $150 to $400 or higher depending on the specific board and local labor rates. A fan motor replacement generally falls in the lower to mid range of that estimate.

Related Kenmore oven codes

All Kenmore oven codes
View all 33 Kenmore oven codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass