We had our Winntec 6020 regulator replaced in June for the same reason (camping May long weekend was when we discovered the problem, and the system worked fine the week before).
Full tanks, super low flow. It ended up being that the regulator failed and was sending full strength propane to our appliances.
Extended warranty covered the diagnosis of the problem, new regulator, new tubing from pigtail to trailer and labour for 1.5 hours. We had each appliance tested to make sure that they were all functional and safe. Had their been a problem with an appliance, then our extended warranty would have covered the appliance diagnosis and repair/replacement. Luckily nothing else was damaged (although we paid $500 for the testing).
eta: we tried everything suggested. We also kept trying our appliances to see if something changed. If the furnace was on, we could run our outside grill, with minimal flame. Our fridge ran very loud and tripped the reset button after 1 minute. We were (told that we were) lucky that we didn't damage any seals in our appliances.
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2016 Springdale 240BHWE
2013 F150
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