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I had a similar problem previously, and eventually traced the heat to the pump itself rather than the boiler firing when not needed (which could have been a setpoint problem). The solution in that case was to not have the pump run continuously, though you might also adjust the fraction of the pump losses which go to the fluid.

I had a similar problem previously, and eventually traced the heat to the pump itself rather than the boiler firing when not needed (which could have been a setpoint problem). The solution in that case was to not have the pump run continuously, though you might also adjust the fraction of the pump losses which go to the fluid. fluid.

This problem of pump heat building up is mentioned in the suggested possibilities:

**   ~~~   ** Possible things to look for to correct this problem are:
**   ~~~   **   Capacity, Operation Scheme, Mass flow problems, Pump Heat building up over time.