Kenmore Dryer F70 Error: No Communication Between Main and User Interface Boards
The kenmore dryer f70 error is a fault signal from the control board — this guide walks through what it means, common causes, and safe diagnostic steps. What Does Kenmore Dryer Error Code F70 Mean? F70 on a Kenmore Elite HE dryer built on the Whirlpool 110.xx platform means the main electronic control board has […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. F70 results in total dryer lockout — no cycles can be run. The dryer cannot be used until communication between the two control boards is restored through reset, harness repair, or board replacement.
Can I reset the code?
Yes. A 10-minute hard reset resolves F70 if the cause was a transient power event. If the UI board, main board, or communication harness has failed, F70 returns immediately after every reset and hardware replacement is required.
When to stop immediately?
Stop if you notice: F70 returns within 60 seconds of every power restoration after a 10-minute reset, Control panel is completely dark or shows only garbled segments.
Symptoms You May Notice
F70 displayed and all control panel buttons are unresponsive
With no communication link to the UI board, the main board cannot receive cycle selections or Start commands — the dryer is completely locked out from operation and no cycle can be started.
Control panel display is blank, showing only F70, or cycling through random codes
The UI board may display F70 in a continuous loop, show a completely blank display, or cycle through partial code sequences if it is receiving no valid signal from the main board.
Dryer appears completely dead with power connected
Except for the F70 display itself, the dryer performs no functions — no motor activity, no heat, no drum light — because the main board cannot execute any command without a valid UI communication link.
Touch or membrane buttons feel dead with no beep feedback
Pressing Power, Cycle, or Start produces no audible beep and no LED response. The tactile click of the membrane keys is still there, but the UI board gives no acknowledgment that input was received.
Possible Causes
Failed user interface (UI) control board
The UI board has failed internally and is no longer transmitting on the serial communication bus — the most common hardware cause of F70 on Kenmore Elite dryers.
Requires ProfessionalLoose or damaged communication harness between the main and UI boards
The ribbon cable or wire harness connecting the two boards has a loose connector, broken conductor, or pinched section that interrupts the data bus.
DIY PossibleFailed main electronic control board
The main board's communication controller has failed, preventing it from receiving data from an otherwise functional UI board — produces the same F70 symptom and requires main board replacement.
Requires ProfessionalTransient power event disrupting board initialization
A power glitch during a cycle can desynchronize the handshake between the two boards, generating a one-time F70 that clears permanently with a full hard reset.
DIY PossibleSafe Checks You Can Do
-
1
Perform a full 10-minute hard reset
Unplug the Kenmore dryer from the wall outlet for a minimum of 10 minutes — longer than the standard 5-minute reset — to fully discharge both control boards. Restore power and attempt a cycle. F70 caused by a power event desynchronizing the boards often clears permanently with an extended reset.
If F70 appeared immediately after a power outage or the dryer was moved and reconnected, the reset alone resolves the issue in a meaningful number of cases. If F70 appears without any power event history, hardware failure is more likely.
-
2
Inspect and reseat the communication harness between both boards
Unplug the dryer and access both the main control board (typically at the rear or in the control console) and the UI board (in the control panel). Locate the ribbon cable or wire harness connecting the two. Firmly disconnect and reconnect both ends, checking for bent pins, broken locking tabs, or visible wire damage. Restore power and test for F70 after reseating.
On Kenmore Elite front-load models, the harness between the boards runs through a conduit along the top of the cabinet and is a known chafe and flex point. Run your hand along the harness route and feel for any kink or pinch that could be breaking a conductor.
Tools required
When to Call a Professional
Contact a qualified technician if:
- F70 persists after a 10-minute reset and confirmed communication harness reseating
- Harness continuity test reveals an open conductor in the communication cable between boards
- F70 persists after UI board replacement with confirmed-compatible part — indicating the main board communication circuit has also failed
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
Dryer Repair Service Schedule Appointment