Jenn-Air Cooktop Error Code U400
Secondary voltage of the power unit too high (primary > 300 V); control unit cuts off after 1 second and gives a long tone due to incorrect connection.
SourceJennAir Downdraft Cooktop - Full Service Manual (W11546679)p. 2-4
The full U400 procedure
Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.
SourceJennAir Downdraft Cooktop - Full Service Manual (W11546679)p. 2-4
Or subscribe: $29/month for all codes plus Max diagnostics, with 70 Max messages a day. Plus applicable tax.
Where this code is documented
1 manual in the MyPros+ library documents this code for Jenn-Air cooktop.
Models covered by the manuals that document this code
75,000+ service documents · 20,000+ error codes · 100+ brands
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax