JennAir Range Code 4d42: Fan speed above normal

What 4d42 means

Code 4d42, shown on JennAir ranges including the JIS1450DS and JGRP430WP, reports that the oven cooling fan speed is too high. An airflow restriction, the fan, or the wiring may be responsible. The oven can stop heating while the code is displayed, and you might hear the fan running harder than usual. It is the high-speed twin of the slow-speed 4d codes, and the display shows it in place of the clock.

Common causes of 4d42

Airflow is restricted in the cooling path
The oven cooling fan is running above normal speed
The fan wiring has a loose or damaged connection

✓ One safe check you can try

1. Allow the oven to cool completely. 2. Move anything away from the range vents. 3. Press Cancel. 4. Turn off the breaker for a minute, then back on. 5. If 4d42 appears again, stop and call us. The fan sits behind panels that are not for owners to open.

! Why to stop there

Fan speed problems are not visible without removing panels.
A noisy fan is easy to blame, but the wiring may be the cause.
Skipping the repair may leave the control exposed to heat.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Range codes

Locked, Lock or LocJennAir Range Oven Display "Locked", "Lock" or "Loc": Unlock Controls and Door Press Cancel to ResetJennAir Range Message "Press Cancel to Reset": Clear the Alert Probe or Insert ProbeJennAir Range Display "Probe" or "Insert Probe": Meat Probe Not Detected PUSH or PSHJennAir Range Display "PUSH" or "PSH": Press Start to Begin Sabbath, Sab, 5Ab, or 5A7JennAir Range Display "Sabbath", "Sab", "5Ab" or "5A7": Sabbath Mode Is On FC E8Registration Error During App Setup: JennAir Range FC E8 FC E9JennAir Range Wi-Fi Power Module Reported Again (FC E9) Feature Not AvailableJennAir Range Message "Feature Not Available": Try Again or Disable Power

4d424d42 questions

Is 4d42 the same as 4d41?

Yes, they share one official meaning: fan speed too high from an airflow restriction, the fan or the wiring. A technician separates the exact cause by testing.

Could a blocked vent cause 4d42?

It could. Make sure nothing covers the vents, and keep the area around the range clear. If the code stays on a clear range, call us.

What should I do while waiting for the visit?

Leave the oven off and use another way to cook. The cooktop may still work on some models, but we cannot confirm that without knowing yours.