Williams is a premium UK brand known for bespoke front-of-house displays (the “Jewellery Box” chocolate fridge and elegant cake display fridges). These units use Williams’ CoolSmart digital controllers for precise temperature and humidity control. Common faults include temperature alarms, sensor errors, and door alarms. Williams displays are robust, but require regular maintenance (like condenser cleaning) to prevent faults.
Typical Faults & Diagnosis: If the cabinet isn’t reaching the set temperature, first check for a flashing condenser clean light – this indicates the condenser may be clogged with dust. A dirty condenser or blocked ventilation causes high internal temperature. Clean the condenser fins with a soft brush to restore airflow. If the controller shows “HI” or “Lo” on the display, it’s a temperature alarm for too high/low cabinet temperature. Ensure the door is fully closed and sealing, as an open door triggers a “DO” alarm (door-open alarm) and leads to temperature issues. Fan failures or overloaded cabinets can also lead to warm spots or high-temperature alarms– check that internal fans are running and not obstructed by cakes or pastries. For any probe failure (sensor fault), the Williams controller will display an error code and engage a fail-safe: for example, a failed temperature probe will cause the compressor to cycle on/off every 5 minutes and show “E1” or “E2” on the screen. In such cases, call an engineer to replace the faulty sensor.
Fault Code Table – Williams Displays: (CoolSmart digital controller)
| Code | Meaning | Diagnosis / Solution |
|---|---|---|
| E1 | Cabinet sensor failure | Air temperature probe faulty or disconnected. The display may show “–” and unit runs in backup mode. Solution: Check/replace the sensor; unit will cycle to prevent spoilage. |
| E2 | Evaporator sensor failure | Defrost (coil) probe fault (may cause poor defrost). Often indicated if evaporator iced up. Solution: Manually defrost the unit for 24h and replace sensor if error returns. |
| HI / Lo | High/Low temperature alarm | Cabinet temperature out of set range (too warm or too cold). Solution: Check door seals, condenser cleanliness, and ambient conditions. Resolve cause of temp deviation; controller will alarm until temp normalizes. |
| DO | Door open alarm | Door left open or not sealing, causing temp rise. Solution: Close the door properly or replace damaged gaskets. The alarm clears when the door is secured. |
| (flash) cL | Condenser clean warning | (If equipped) Indicates condenser overheating (dirty). Solution: Clean the condenser coil to restore airflow. The warning light resets once temperature normalizes. |
References: Williams user manual (fault codes), Williams service FAQ, and Williams error code guide. Always consult the Williams official manual for your model. (e.g., Operating Manual for Williams Cabinets)