E21 on the Valley Pro / Pro2

An independent guide from FixMyPivot, not from the manufacturer. Brand and panel names are here only so you can find your own equipment.

What it means

Low flow, on machines with the variable rate zone option.

On some firmware versions this code is not assigned and shows as not available. Where it is used, it means the water flow stayed below the minimum flow setting for 3 seconds while pressure was above the low pressure setting, and it shuts the machine down. It needs the optional flow meter. The firmware version is printed on the error screen.

This code is on the Pro2 only.

E21 on other panels

This page is for the Valley Pro / Pro2. The same code on another panel can mean something else:

Safety

Center pivots run on high voltage and heavy moving machinery. Shut off and lock out power at the main disconnect before you open a panel or touch anything electrical. If you are not sure, stop and call your local pivot dealer or a licensed electrician. These pages tell you what a code means. They do not replace a qualified technician, and the safety instructions that came with your equipment come first.

FixMyPivot is an independent troubleshooting service. It is not affiliated with, authorized by, or sponsored by any equipment manufacturer. All brand, panel and product names are trademarks of their owners and are used here only to identify the equipment a code appears on. This information is general, is provided as is without warranty, and may not match the software version on your panel. Use of these pages is subject to our Terms of Service.