To determine if the valve coil needs to be replaced: Remove the cord set and use an ohmmeter to check the resistance of the coil. The resistance reading for the 120Vac coil should be 400 to 500 ohms; the 12Vdc coil - 15 to 25 ohms; the 240Vac coil - 1600 to 1800 ohms. If the meter shows an open circuit, replace the coil.
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