The wiring for my pumps is not set-up as shown on the wiring diagram found on page 14 of the manual. Two things stand out to me: the diagram indicates there should be wires connected to each of the L1-L2-L1 connectors, but on my system there are no wires connected to the left-most L1, but two connected to the rightmost L1. there is a single pair of black/white wires connected to the L1-L2 ports that lead to the pumps. Therefore I must conlclude that either both pumps are wired in series (both run when the system operates) or only a single pump is wired up. This would match up with my observed flows from a few weeks ago. I also listened yesterday ton the pumps with a cheap stethoscope and while both had sounds within, one was more noticeable (say 30% louder), which I could interpret as meaning the louder one was running, the less loud one then picking up sounds from the nearby running pump plus the sound of the flow through it, but not actually running. I have attached a photo of a sketch I made of the wiring in the furnace whilst looking inside the unit at an awkward angle. The wiring diagram specific to the pumps is also visible, look at the upper right for the pump wiring specified by waterfurnace. What are the implications of this non-standard wiring?