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Led Indicator

I have  been working through some control issues on some older lochinvar cw series boilers. Most of the problems are related to intermittent air switch safeties (their are 5 on each,wired in series) I am considering mounting some led indicators on the front of the boiler that would show the status of the switches as well as the gas valve and boiler stages. Has anyone worked with a product like this one?  <a href="http://www.industrialcontroldirect.com/File/ICD-LED-Indicators.pdf">http://www.industrialcontroldirect.com/File/ICD-LED-Indicators.pdf</a>

Any words of wisdom on this approach?

The air switches have been frustrating as the usually work fine with the cabinet door off.

"If you can't explain it simply, you don't understand it well enough"
Albert Einstein
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