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Error Code

Kenmore Cooktop Code 40 Main and Filter Board Error

Plain-language guidance for Kenmore code 40 on Cooktop — symptoms, safe checks, and when to call a technician.

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At a glance

Error code overview

A plain-language snapshot of 40 for Kenmore Cooktop — confirm the model series before you act.

Daniel Reeves Written by Daniel Reeves Appliance Repair Content Specialist Published October 20, 2026

Content status Verified

Error code 40
Appliance Cooktop
Quick answer

Code 40 reports a communication error between the two boards. The manual's order runs from harness checks to board replacement.

Model compatibility

Kenmore reuses codes across series and model years, so 40 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 this code means

Communication error between the main power control board and the filter control board.

The 40 condition

Communication has failed between the main power control board and the filter control board.

In the manual’s order

  1. Disconnect power.
  2. Check the harness connections on the filter control board and the main power control board.
  3. Connections good: replace the main power control board.
  4. Problem persists: replace the filter control board.

Covered cooktops

The Kenmore 790 induction range of models, with codes shown as numbers only.

Related cooktop codes

The main-to-filter communication code: the same communication error under a different number. The touch board software code: a software mismatch after a new touch control board. The supply voltage code: a supply voltage or wiring problem.

Repair in your metro area

In the Miami, New York, Houston, Los Angeles and San Diego metro areas, Kenmore cooktop repair can be arranged on (844) 747-3641. Have 40 and the model number written down.

Source: Sears PartsDirect – induction cooktop (790 model) error codes

Caution

Safety warning

Important safety warning

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.

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(844) 747-3641
Phone (844) 747-3641
Email info@kenmoreservicecenter.support
Hours Mon–Sat: 8:00 AM – 7:00 PM
Service area Serving Miami, New York, Houston, Los Angeles and San Diego metro areas.
Response time Same-day and next-day appointments in most areas.