HRV Operation question

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06Honda

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I have an HRV that runs via a wall mounted dehumidistat. I turn the dehumidistat dial until it clicks to start the HRV, problem is it doesn't always startup. It can take a few tries but once running its fine. Any ideas what may be causing this. Not sure if it is the dehumidistat or the unit itself. The HRV is a Venmar AVS Constructo 1.5
 
Replace the switch with a light switch, if the motor starts, then your switch is questionable.
 
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