Service light on Honeywell humidifier
Sounds like a Water Level Sensor problem. Read the service manual, pages 51 and 53.
http://www.forwardthinking.honeywell.com/related_links/humidification/69_2285.pdf
Unplug the power cord. Turn OFF water. Remove the Water Level Sensor - One screw holds down the spring clip. Remove water scale in the compartment and on the Sensor. Test Sensor with an ohm meter. If OK, reassemble and try again. If bad, replace the sensor.
If you have heavy scale buildup in the sensor compartment, you need better water filtration. Your problems are just starting. This system can be very difficult to clean thoroughly.
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