How to isolate an earth leakage problem

[Dave A]

We get many calls where "the earth leakage unit won't reset". In trying to talk a client through identifying the problem, we also cover this issue:

With some earth leakage units, resetting a tripped earth leakage unit is as simple as flicking up the switch.

However, with some earth leakage units, you must first flip the switch down completely before flipping the switch back up.