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mastercool swamp cooler computer board?

  I   have a mastercool swamp cooler  with a circuit board.   The cooler works good on high and low but the pump will not come on even though the  inside panel sayes it is on .   Does anyone know what diode to replace  so the pump will work .  The circuit board lookes good .  no burns anywhere.   

Burf7 years ago
It may not be a controller issue at all.  Have you checked the pump to be sure it hasn't burnt or shorted out? Those pumps are notoriously short lived.