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Hello, here's what I come across when no water flow.
First thing I is call for heat at thermostat to energies what you call needle valve, it is a solenoid actuator that opens with 24volts when there is a call for heat , then make sure call for humidification is set on dial.
Open front cover on your humidifier and check for water coming out of tube on top of your evaporator plate. if no water, your needle valve is clogged with water contaminants, or check if you got 24v going to that needle valve with a volt meter. if you dont have a volt meter rotate your humidifier control back and forth and listen if valve is coming on and off. If it does make a sound and still no water replace valve.
Last thing is you can loosen nut on your butterfly valve to make sure there is acctually water pressur there.
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