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Glen Stanton

involved the possibility of the boiler water temperature stacking in temperature either in the off cycle after a previous run or in the off period because of a power interruption (this was your case) while it happened to be running. The boiler is equipped with a Honeywell Auxilliary High Limit to interrupt the burner in the event of the electronic high limit exceeding the desired temperature. We discovered that we were also interrupting the power to the internal injection circulator if these previously mentioned conditions occured. This would cause the boiler to remain off until the temperature dropped enough to satisfy the limit differential again.

The sub-harness I sent corrects the problem by keeping the injection pump active to keep flow going through the boiler in order to drop the temperature. This could also have happened if the electronic (programmable) high limit setting happened to be set too close or above the auxilliary high limit setting. Thanks for your patience and I'm glad that all is well now.



  • Frank_17
    Frank_17 Member Posts: 107
    Glen Stanton

    Thanks for the help last week on the Opus . Worked perfect.
    BUT....I am not just a parts changer . I need to know what the problem was and how did you fix it? Just for my own peace of mind...
    Thanks again
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