Maybe these panels are not faulty ?,
Intermittent faults like the one's described ,can be linked to induced ~AC~.Even if these systems were installed professionally, spikes can cause issues.
How many systems do you guys recall working on that haven't had a suppressor fitted, either as standard or a pre fix ?,
Us electricians know how to test for induced ~ , and we also know that most meters won't register a reading, gts got me thinking here when he suggested this engineer was a component changer.
Wonder if these panels had these four quid filters fitted?
e manno
August 2012