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I am having problems with my circulating pump on my primus heating system in my Holiday Rambler Navigator. It works most of the time, but sometimes it quits pumping and the fluid boils out on the ground. The pump keeps power but the pitch of the pump gets higher when the pump decides to quit circulating. I was told that the pump motor uses a magnetic drive system and some how the motor gets too much current and the magnet quits working. Any suggestions or should I replace the pump?