If the efficiency figures of your systems are not entered correctly you may come across errors running the PartL calculation, such as:
"Keyword out of range: Heat SSEFF"
This error indicates that one of the Heating systems Seasonal Efficiency has been set to a very low figure. The heating systems should be examined and any incorrect efficiency figures should be changed to a sensible figure.
In general, when there is no percentage character beside efficiency variables, these must be added as factors - eg 0.65 as below for Generator Seasonal Efficiency for a hot water.
Other efficiencies allow for a percentage figure to be entered, as with HVAC heating efficiency below:
On these, you can also find a dropdown to switch between percentage or ratio as you wish.