Purpose and Applicable Part/Model Numbers


This Document addresses out of range sensors for the H2 Zero system.

Troubleshooting Steps 

The only way that a minor alarm will trigger on an H2 Zero with firmware r04 is if a hydrogen sensor is out of range. If you are seeing question marks on the main controller while the unit is in a minor alarm, then this issue is casued by an out of range Hydrogen sensor.

Keep in mind that when using firmware r05, any hydrogen detection will cause a minor alarm. 

If you are experiencing problems, please contact Comm/net Systems Support


Comm/net Systems Inc. Support


(206) 282-8670

or submit a support ticket through this portal.