LOL A Real On Topic Question!! Imagine that!!

[ABLE1 <somewhere@xxxxxxxxxxx>]

Hey guys!!

I have serious question.  I have a customer that has a
door access keypad mounted on a single gang plastic box
that it mounted on the side of a steel building next to
the door.  The keypad is a IEI 212W which is weather rated.

The original keypad was installed 5+ years ago.  Last week
the customer reported that the code was not always working.
It took a couple of tries on the keypad to get the code to
energize the electric strike.

When I got on site all looked good but I noticed that that
not all keys were reliable.  The decision was made to
just replace the keypad.  I ordered a new unit, same model,
and installed two days later.  Programmed and all was good.

When removing the old keypad I noticed some rust on a few
terminals.  Upon further inspection back at my office
I noticed some other areas on the circuit board that had
some spots that may have been moisture related.

First off this keypad was mounted with the supplied foam
gasket and tight.  The inside of the box was dry.

The only opening to the box is where the wire penetrates
the back from the inside wall cavity.

The question is how did water get inside the box and on
the keypad terminals and circuit board??

I am thinking condensation.  If I am right then how to
fix the problem??

This is where I stop typing and look to read possible
solutions from the crowd.

Oh and local temperatures range from 20F to 100F +/-

Thanks for any thoughts!!

Les