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User Manual 5.6 Check Varistors If the one or more of the varistors might be out of function, please according to following steps to check or replace the varistors: 1. Loosen all 6 captive screws of the removable front lid. Right after the 6 captive screws are removed, please keep them at a distance. Lift the lid upwards and remove it. 2. Then you will see the 7 varistors in 2 groups: 4 in the left side and 3 in the middle area. 28