You can pull the plastic cover off the relay, and manually actuate it with your finger.This will quickly narrow down the problem.If nothing happens when you actuate it, the circuit after the relay has a problem.If the fan turns on, then its most likely the circuit before the relay or the relay itself.You can test the relay with an ohmeter across the relay's coil contacts, if its open or has a high resistance, then the relay is bad.
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