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Hi Mike, Code F is burner failed to ignite or reignite. Make sure there's LP to the gas valve and it's working and the burner is clean. Code H is 120V Heater falied open. Check for 120V to heating element, if yes, check for 38 - 53 ohms resistance on the heating element, if no ohms or infinite the element is bad also. If ok, probably a bad circuit board. Good luck
On My Norcold N621 it's working fine on 110V.
On LP, The ignitor continue to ignite even that flame is on, and than after a few seconds it will shut the flame off & I get the F indicator in the display.
Sometime it will work fine for a few hours & than will shut off & I get the F indicator.