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Ruud furnace lights but blower only works with fan on not auto on therm.

Old style fan kit with relay

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Sounds like the automatic fan control not working not cutting in on temp rise to bring fan on .

Posted on Dec 10, 2016

Testimonial: "yes i wasn't sure i had watched the dial turn and click it came on once then would not again i thought it might be the relay. thanks for your help! Doug..."

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Wish I knew how old your furnace is. Let me answer your question directly. In the heat mode the fan runs independently from the air conditioning fan relay. Its either brought on by time or temperature. An old furnace will use a fan and limit control that uses a coil to sense the heat exchanger temperature and turn the fan on or off. Newer furnaces use a timer on a circuit board. 20 years or newer Ill bet its a timer board. Follow the blower motor wires back to the component and ill bet that's the culprit. Hope it helps. Good luck.

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I'm not sure what setup your unit has but the fan relay sound like it is bad. If your blower connects to a circuit board then the board could be bad. Different units use different ways to control the fan. Some use a relay like I mentioned. Some use the circuit board (newer units). Some even use a sequencer. The first step will be finding what yours is using. Since you tried disconnecting the green wire from G already and it didn't cut off I would think your thermostat is not the problem. Let me know what you find.

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Commonly outdoor wood boilers use a hot water coil mounted in the ductwork above your furnace. In this application the Ruud furnace is still using its blower assembly to circulate the warm air from the boiler to your home. If this is the case. Have your heating guy install a #50 relay on the furnaces blower motor to activate your much needed humidifier. If this is not the case and your Ruud furnace is totally independent of the boiler. Still install the #50 relay in the furnace and manualy activate the fan only feature on your thermostat.
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