F4 represents the fault of the exhaust temperature sensor of the water heater. This fault code will be displayed only when the exhaust temperature sensor is open or short circuited.If this fault code occurs, check whether the components at the exhaust temperature sensor, main board, electronic expansion valve and filter are abnormal.If they are all normal, it may be that the system pipeline has leakage, so it can be repaired and refilled with refrigerant.Common fault code of Haier air energy water heater: 1. The air source heat pump water heater displays fault code E1. Fault judgment: leakage alarm.2. The air source heat pump water heater displays the fault code E2, and the fault judgment: overtemperature alarm.3. The air source heat pump water heater displays fault code E3. Fault judgment: the water tank temperature sensor is faulty.4. The air source heat pump water heater displays fault code E4. Fault judgment: ambient temperature sensor fault.5. The air source heat pump water heater displays fault code E5. Fault judgment: defrosting temperature sensor fault.6. The air source heat pump water heater displays fault code E6, fault judgment: exhaust temperature sensor fault.7. The air source heat pump water heater displays fault code E7. Fault judgment: communication failure.8. The air source heat pump water heater displays fault code E8, fault judgment: the pressure switch protection acts.9. The air source heat pump water heater displays fault code E9, fault judgment: ambient temperature protection action.
Haier gas water heater displays f4, which indicates that the refrigeration sensor is faulty (short circuit or open circuit).That is, the refrigerator cannot enter the AI state;Over temperature alarm and freezing temperature display functions cannot be executed.
