Four cooling fan codes: 4D21 and 4D22 report a fan speed that is too low, 4D41 and 4D42 one that is too high.
Model compatibility: JennAir reuses codes across series and model years, so 4D21, 4D22, 4D41, 4D42 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
4D21 and 4D22 report cooling fan speed too low, 4D41 and 4D42 too high; JennAir names an airflow restriction, the cooling fan or its wiring.
JennAir spells out the symptom for these four codes, which is not common among oven codes. 4D21 and 4D22 report a cooling fan speed that is too low. 4D41 and 4D42 report one that is too high.
Codes at a glance
Code
Fan speed
4D21
Too low
4D22
Too low
4D41
Too high
4D42
Too high
JennAir gives all four the identical list of possible causes and does not link the numbers to different fans.
Possible causes named by JennAir
an airflow restriction;
the oven cooling fan;
the wiring associated with the fan.
General background, not from JennAir: cooling fans pull air through an appliance to take heat out of it. The page never says where a blockage could be or how to locate it.
Power reset to try
Turn the oven’s breaker off; a full minute should pass.
Turn it on.
For one minute, look for any 4D code returning.
Make sure the oven works.
JennAir presents this reset as all an owner does, and says nothing on whether the blockage lies outside the appliance or within.
A code that comes back
Treat a repeat appearance as a reason to book service. JennAir’s page ends after the reset, and the parts it names sit inside the appliance. Mention the exact number from the four when you call.
If a JennAir range or wall oven in Los Angeles shows a 4D2 or 4D4 code, the number to call is (310) 622-9465. Describe the code and the breaker reset you tried. For service details, see wall oven repair.
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 JennAir appliance?
Book a specialist visit for a clear estimate and approval before any repair.
