When you turn on the propane heater switch, normally you should hear a relay, then a clicking sound from the spark igniter. The squeal is not normal in my opinion. I would open the panel, have someone activate the heater, and see if you are getting a spark in the burner tube. Easier to see in low light. Listen for the squeal - I have a suspicion your gas solenoid may be bad. Had that happen on my fifth wheel after it sat a while. You can get parts through Camping World for many heaters.
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