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Posted by jeff on April 05, 2011 at 10:17:27:
In Reply to: Re: 7800 Fault posted by boilerman on February 19, 2011 at 10:58:32:
: : : We are getting a honeywell 7800 fault 109 on our CB, Call service. I think it has something to do with ground, this just from searching. Anyone got any help? Thanks!
: Bad neutral. Check for voltage form L2 to ground
it could alse be an external power source froma a relay etc. or your relay is bad on the 7800
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