Have you checked the switch connections? If the swich is at fault then the power will not be pased via it to the blower. Check for live output from the switch. Also check that the live out put is at the plug onto the blower. If all is well then I would bench test the blower and if at fault or if the switch is at fault, get a replacement from ebay. There are a number being broken but shop around a prices vary by huge amounts dependant on whether the breaker is private or trade.

good luck

OLDMINIMAN