Randall09 Posted December 6, 2010 Report Share Posted December 6, 2010 Hi I have recently just bought a 2003 cal spa with a 2100 controller on it. When i first got the tub up and running everything worked well but the other day my heater stoped working it is a XL Heat Exchanger. The light is still on in the controllel panel but the water is not heating up. I was wondering what i could do to check the heat exchanger Quote Link to comment Share on other sites More sharing options...
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