The knob on the 701-MD & 720-MDO only turns a few degrees and then stops.

The input and output cables are switched around the wrong way. Power is on the output and should be on the input.

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When the solenoid button is operated on the 600-GDL you can hear the solenoid click but the gas appliances go out after a short time.

The solenoid is being pulsed with the supply voltage but is not receiving the hold voltage. The hold voltage should be approximately 4.5v. If you are not getting 4.5v after the initial pulse then the 600-GDL will need to be replaced.