Dampp-Chaser question

[PNOTNR@AOL.COM]

List,

I have a customer with a Baldwin SD Grand with a Dampp-Chaser System with two 
humidifier tanks  The low water lights both plug into a fixture which in turn 
is connected to a single humidistat.

This customer tells me that if both lights are blinking and she adds water to 
one tank, both lights go out.  The two tanks are independent.

I tried unhooking the low water probes, and swapped the two plugs where they 
enter the humidistat, but can't figure out why either both lights are on or 
off.

Actually I guess I'm more puzzled why the system used to identify which tank 
needed water when first installed... but the customer says it did!

Any ideas as to why things changed?

Gordon Large, RPT
Mt. Vernon, ME