to check a solenoid coil isolate the mains power supply
use a multi meter set to ohms and place the probes on each terminal of the coil.
you should get a reading of 3.4 kohms or above.
solenoid valve assembly(83304130) which retails at about £30
you only need the coil item number HYDR-27600
retails at about £15.
let me know what reading you get.
hi-spec plumbing & heating (essex)
July 2010