Gb - 30 Maintenance- Avoid cleaning the unit with volatile liquids such as solvents or cleaning fluids. Use a soft cloth andneutral detergent.- In order to maintain water tightness, we recommend the replacement of the seal of the remote controlbattery cover every year. TroubleshootingShould your EXPERT 600 stop working or develop a fault, first read this guide over, then check thebatteries and replace or recharge them if necessary. Also check that you are using the productcorrectly.If you encounter any problem, re-code the receiver collar with the remote control (ref. re-codingprocedure).If the problem persists, contact your distributor or check out on www.numaxes.com.You can also contact NUM’AXES at +33.2.38.63.03.84 or by Email internationalsales@numaxes.com.Depending on the extent of the malfunction, you may have to return your product for service and repair.For all repairs, please supply the following:- the complete product- the proof of purchase (invoice or sales receipt)If you omit one of these items, the After Sales Service will have to invoice you for any repair costsincurred.