Aprilaire 700 failing control boards


Old 01-08-06, 06:39 PM
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Aprilaire 700 failing control boards

I have an Aprilaire 700 that is in need of it's third control board replacement in a year's time. The most recent board lasted three weeks before failing. The unit is plugged into an AC outlet on the furnace that is powered when the blower kicks on. I replaced an Aprilaire 760 with this 700 model a year ago but I did not change the humidistat or any internal wiring to the furnace, assuming they would work on the 700 model.

Any suggestion as to why I am burning up control boards is greatly appreciated.


Last edited by sboccio; 01-08-06 at 06:59 PM. Reason: additional info...
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Old 01-08-06, 08:12 PM
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power coming out of the furance 24 or 120 volts???
Old 01-19-06, 06:00 PM
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Is your 24v connected to the 24v on the furnace. it shouldn't be. The 24v wires through a 50relay to the humidistat and back.
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