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@Verna that is odd, can't think of anything in the Alde that would require leveling? Only possible explantation might be the flame sensor, the flame would tend to be verticle and if you are enough off level I suppose the flame may not hit the sensor?
I've seen this error a number of times.After I cycled Alde power- it goes away. any thoughts as to what to look for?Alde 3020. 5500ft. Mid 40's. good battery and propane.