My 2 year old Raypack howls everytime I turn it on. The manual says could be the unitherm governor, a clogged gas line, or clogged heat exchanger tubes from imbalanced chemistry.
I have never had this issue in 20 years of pool ownership, and the difference this year is that I added some high cal based on the pool store's chemical test.
The UG has been replaced and still no luck. It looks like heat exchanger tube is clogged based on the lack of flow on the Linley pip from the filter to the heater....doesn't seem to be much water flowing into the heater.
Any tips on how to clean the heat exchanger tubes or other things to look for ?
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