Serfas Cycling - Recent Questions, Troubleshooting & Support

It could mean the battery needs to be replaced.

http://www.manualsonline.com/

Try looking here Free User Manuals and Owners Guides ManualsOnline com

Fixya is a place to ask people questions, not to obtain things directly. Usually the best thing to do first is search Google, but I could not find a manual for your computer that way, so I'd suggest you contact Serfas: https://www.serfas.com/contact-us I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

They sold you the product, so they need to support it and help you. The unit may be defective, or it may just be a communication problem. I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

go to the bottom and click on si-40 instructions https://www.serfas.com/products/view/73/referer:products%7Cindex%7Cbike-accessories%7Ccomputers

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Try this... Schrader to Presta Adapter Slime 23042 Presta to Schrader Valve Adapter Silca 30 0 Presta Schrader Adaptor Head Innovations Presta Valve Adapter from BikeBling com

I am assuming you are trying to inflate a presta valve. If that still doesn't work, your pump may need new seals, or is damaged in some way.

Scroll to the bottom of the following site page and click "User Manual" (which you can save).

https://www.serfas.com/documents/download/9

generally you have to put the pump up to the nozzle and have the lever down then put the nozzle in tightly and then pull the lever up. If after several attempts it doesn't work the pump may be broken, as bike pumps generally break easy