The cable contains three wires that connect the inside unit and the outside unit.  If either the black or the white wires are broken or if the connections are bad (at any point between the inside & outside units), the unit will not accumulate any degree days on the 'heat only' counter.  It is possible for the cable to be broken and the black & white wires could be making contact with each other.  In that situation, the meter would accumulate approximately 100 degree days per day on both counters.  If the green wire is broken at any point between the units or the connection is bad, the meter will accumulate approximately 100 degree days per day on both counters.
    To check the cable for possible problems, simply examine the cable for cracks, cuts, or exposed wires.  It is very important to examine the connections very carefully, especially if the problem started when the meter was installed (or moved) or if the problem began after a period of high winds.
    To replace the cable, disconnect the inside and outside units and remove the present cable.  Use the same path between the inside and outside units when replacing the cable.  The cable is a common 3 ply 18 gauge cable, which is available at most electrical stores.  We can also send you the cable immediately if you call with the length of cable.  Our phone number is (269) 343-1221.  It is generally suggested that the cable be replaced after 15 years of good service.