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Rather then keep buying parts that you may not need use this short PDF I put together for TS the Suburban WH in LP mode...
Have a helper turn on the WH in LP mode while you stand outside and place your fingers across those two LP solenoid valves.. If they are getting 12 vdc signal from the ignitor board you will feel both of them clunk when they open.
** Both must open or no LP will flow
** You should also already be hearing the ignitor firing when those two solenoids open
You can easily measure for 12 volts DC across the WH thermostat for the 12 volt side to verify its working before buying that part
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