Check voltage and stuck/frozen valve.
Mine stuck too after a fill up in close to freezing temps.
Dealer said to always carry a meter with me, he was right. If comfortable with a volt/ohm/R meter, check along the switch to solenoid path for 12 volts to the magnet solenoid for power when switched on. This will eliminate or confirm a lot of possibilities quickly.
Test for 12 volts at the switch and at the magnetic solenoid. If 12 volts where / when expected - crawling under the rig to the solenoid valve location, removed the solenoid magnet ring from the cutoff valve shaft (held on by a nut and sits on a sleeve over the shaft), tap it with a non metallic object (not a time or place for sparks) and fiddled with the crimp connections to the magnet solenoid ring (stuffed in the as line connection locations under shield - while testing for 12 volts to the solenoid when switched on), reassembled magnet solenoid on valve shaft and see it it starts to work. You wil hear the "clunk" when the valve opens.
In our case thinking it may have frozen up from full refill a few cold hours before or a loose crimped connector. Has been working since. Adding a rare earth magnet to the tool kit ;-)
Others have had to fiddle with crimp connectors on the switch by the tank fill switch, all these crimped connections along this circuit under the chassis are exposed to the elements (would prefer to have seen automotive moisture tight connections not mechanical crimped under the chassis area), to get the 12 volts to the magnet.
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