Circulating water pump does not start or operates improperly
Fault — the ESS unit enters fault protection and stops normal operation until the fault is cleared — how it is shown (LED pattern or display code) depends on the model.
Circulating water pump does not start or operates improperly
Cause: Power off, loose circuit connection, damaged water pump, or air in cooling medium / no cooling medium.
Check main power switch; tighten circuit connector; replace damaged water pump; evacuate air or replenish cooling medium.
Source: fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
HVAC-PUMP-FAIL means: Circulating water pump does not start or operates improperly. Power off, loose circuit connection, damaged water pump, or air in cooling medium / no cooling medium.
HVAC-PUMP-FAIL is a fault code: the ESS unit enters protection and stops normal operation until it is cleared.
Check main power switch; tighten circuit connector; replace damaged water pump; evacuate air or replenish cooling medium.
Prefer the full written guide? Read the complete Felicity inverter error-code guide
Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.