The EVSE Directory · Field sheet · Power Electronics · PE-NB-COOL
PE-NB-COOLCooling pump Contactor chatter
Power Electronics · NB 360 · Liquid cooling
Verified 2026-07-301 field confirmsSeverity: medium ~75 min
Safety
LOTO before any pump or contactor work. Never run the coolant pump dry — this can destroy the pump seal within seconds.
Full procedure requires solo+
Symptom teaser: Power Electronics NB360's cooling pump or an associated contactor exhibits audible chatter accompanied by flow-related fault codes, with a thermal derate typica…
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