U400 carries two labels; only the stand-alone cooktop article offers a one-minute reset.
Model compatibility: Fisher & Paykel reuses codes across series and model years, so U400 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
U400 is a temperature or power issue in the full-surface induction cooktop article and a power supply error in the freestanding cooker article.
Most codes on these appliances start with E, F or A, so a U stands out. U400 is in two support articles, with different labels.
Article
Label
Owner step
Full-surface induction cooktop
Temperature or power issue
Power off at the supply, wait one minute, restart
Freestanding cooker
Power supply error (listed with E40)
None; book a service repair
Both point toward power, and the first adds temperature.
Stand-alone cooktop
Cut the power supply to the cooktop, leave it for one minute and restart. This article also suggests good ventilation around the unit, to prevent overheating. If U400 shows again, book a service repair.
Freestanding cooker
No reset is given. The article’s general rule for codes without a procedure is to book a service repair. It further warns that turning the supply off while the oven is too hot can damage the oven and the cabinets surrounding it, so leave the supply on during that time.
Which one is yours?
The sources do not match labels to appliances. The cooktop article gives the one-minute reset and the cooker article gives owners nothing. When in doubt, take the careful route: let the unit cool, wait, and do no more than a single one-minute off and on. Nothing else about U400 is documented.
Related codes
E40, the other power supply error in the cooker article.
E45, in the same temperature or power group of the cooktop article.
U400 repair in Los Angeles
A U400 that keeps appearing on a Fisher & Paykel cooktop or cooker can be reported on (310) 872-1939 for service in Los Angeles. Give the code, the kind of appliance and its model details. The cooktop and range repair page describes the work.
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.
Seeing this code on your Fisher & Paykel appliance?
Book a specialist visit for a clear estimate and approval before any repair.
