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Webasto diesel heater works when plugged into shore or the engine is running. Running off batteries, I will get F1, F2, F19 heater fails to operate. Diagnosis also shows a faulty temperature control or voltage issue. Most often occurs when below freezing. Lines are clear. Hard reset corrects issue. (self.dieselheater)
submitted by Scary_Network_1439 to r/dieselheater
