Foster is another leading UK brand, supplying patisserie and cake display fridges known for reliability. Foster units often use digital controllers that display text codes for faults. Common issues include temperature alarms (especially if the cabinet is overstocked or used in a warm environment) and sensor errors. Like all displays, they require a clean condenser and proper airflow.
Typical Faults & Diagnosis: Start with basics – is the unit powered on and the thermostat set correctly? Foster’s manuals emphasize checking that the fridge is plugged in, the supply is correct, and the internal thermostat is at the proper setting. If the display is flashing “HI”, it means the cabinet is too warm, possibly due to a door left ajar or a failing sensor. Ensure the door closes tightly and that the door seals are intact (worn seals cause temperature drift). A “do” code (door) indicates the door switch alarm – check if the door switch is functioning or if the door was open too long. Many Foster units also warn of a “cL” (condenser clean) condition which signals the condenser coil is running hot. In that case, carefully vacuum or brush the condenser to remove dust. If the unit isn’t cooling at all, listen for the compressor: a rapid clicking could mean it’s trying to start under low voltage or a seized condition. Verify the ambient temperature isn’t too high and that there’s at least 10cm clearance around vents for airflow. Persistent temperature issues (not cooling or freezing products) might point to a faulty thermostat or controller – a skilled technician can test these components.
Fault Code Table – Foster Displays: (Typical Foster controller readouts)
| Code/Indicator | Meaning | Explanation / Action |
|---|---|---|
| dEF | Defrost cycle in progress | The unit is in active defrost (normal periodic cycle). Action: None (display fridge will resume cooling after defrost). |
| oFF | Controller in standby mode | The fridge has been turned off via the controller. Action: Ensure the controller is switched “ON” for cooling. |
| cL | Condenser clean warning | Condenser temperature high (possible dust build-up)Action: Clean condenser fins to improve cooling. |
| do | Door open alarm | Door is open or door switch fault. Action: Close door properly; check door seal and switch. |
| HC | Condenser high temp alarm | Condenser or compressor running hot (could follow ignored cL alarm). Action: As above, clean condenser; ensure ventilation. |
| E1 | Probe 1 (cabinet sensor) failure | Cabinet temperature sensor fault. Action: Fridge runs but temperature may be unregulated – call engineer to replace probe. |
| E2 | Probe 2 (evaporator sensor) failure | Evaporator/defrost sensor fault. Action: Check for ice build-up; sensor likely needs replacement. |
Notes: Foster’s error codes are often similar to other brands’ controllers. For example, E1/E2 in Foster units correspond to sensor errors just like Williams. If a “HP” or “HC” error appears, it might indicate a refrigerant high-pressure alarm or overheating condenser – ensure the cooling fans are working and ambient conditions are within spec. Always refer to the Foster manual or Foster error code guide for your specific model.