Those OTHER EFFECTS of ICING and sub-zero FREEZING
Looking at the Center Tank componentry that controls the automatic fuel transfer of CT fuel and pump inhibiting due to low pressure/contents etc, what components in the center-tank could conceivably be PREVENTED from operating (and possibly also from supplying warnings or inhibiting or switching off pumps) - by being iced (up or OVER)? Thinking float switches, flow switches, pressure switches or any combo of intermediating transducers or relays that could become iced (and later thaw and operate - creating the "on approach" situation of water-contaminated fuel supply).
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Center section tank-mounted components that are low in the tank and would be covered by sheet ice are possible candidates - but also some components may have a lower temperature non-functioning trigger threshold that has so far not shown up.
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Electronics can be prone to hibernation at extremely low temperatures and many components have moving parts, however small, that can be prone to immobilization due freezing/ice-over.