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radioman

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  1. radioman's post in aquahot works like a champ but..... was marked as the answer   
    Im guessing if its a 450D you have the electronic LED control board mounted on the bay wall? If this is the case there is only one thermostat that calls for heat. The other two are safety thermos that trip off and turn off the electric element and the second  one turns of the diesel if anything goes wrong, they are manual resettable. The one control thermo turns on diesel and electric when the boiler solution drops below a certain temp like 165F. If you dont want diesel to fire up you have to turn off the diesel switch.
     
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