Hello,
It sounds like the fan that works with a higher fuse is bad, this fan pulls too much amperage which is inhibiting the operation of the computer trigger, that why it works with a manual command, but not the natural monitored computer command. I would replace both fans and the relays to see how it goes,
Here is a wiring diagram to help with the repair.
Image (Click to make bigger)
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Saturday, June 25th, 2016 AT 10:52 AM