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I wrote that measure a long time ago, perhaps something's wrong with it, otherwise it's your model. So let's start assuming the measure is at fault (that's the easiest) before checking the model:

Start by opening your resulting IDF file, and check that you have a Site:WaterMainsTemperature and that it is what you expect, in your case it should be:

Site:WaterMainsTemperature, Schedule, !- Calculation Method {SCHEDULE | CORRELATION} Cold Water Temp CZ9; !- Schedule Name

If so, check that your schedule is also present in the file, and correct.

Second, you can try with the "Correlation" option, you can leave the default values of the measure (these are for JFK airport (NYC) FYI) for now. See if that works better...

I wrote that measure a long time ago, perhaps something's wrong with it, otherwise it's it could be your model. model or an E+ bug.

So let's start assuming the measure is at fault (that's the easiest) before checking the model:

Start by opening your resulting IDF file, and check that you have a Site:WaterMainsTemperature and that it is what you expect, in your case it should be:

 Site:WaterMainsTemperature,
  Schedule,  !- Calculation Method {SCHEDULE | CORRELATION}
  Cold Water Temp CZ9;             !- Schedule Name

If so, check that your schedule is also present in the file, and correct.

Second, you can try with the "Correlation" option, you can leave the default values of the measure (these are for JFK airport (NYC) FYI) for now. See if that works better...