Fault guide
Cold Room Controller Fault — Sandton Repairs
A faulty controller can cause temperature swings, failed defrost, or false alarms — and is often misread as a refrigeration fault. Proper diagnosis avoids unnecessary refrigeration work.
Symptoms
- Temperature not holding at set point
- Defrost not running or running too often
- Alarm sounding incorrectly
- Controller display blank or showing error
- Room too cold or too warm
Possible causes
- Failed temperature sensor or probe
- Defrost timer or schedule fault
- Control board failure
- Incorrect settings after a power loss
- Wiring or connection fault
- Sensor out of calibration
Safe basic checks
- 01Check the set point has not been changed
- 02Check whether the display is blank or showing an error code
- 03Note whether defrost is running at all
When to call a professional
If the controller or sensor is suspected, call a technician — we test the sensor and control outputs before touching the refrigeration system.
Do not attempt electrical, refrigerant or internal mechanical work. Call 069 268 0988.
Repair options
Sensor replacement, defrost schedule correction, control board repair or replacement, recalibration, or controller replacement where obsolete.
Maintenance prevention
Controller and sensor checks at each service visit catch drift and faults before they affect stock.
Speak to a technician
069 268 0988 012 546 6670 WhatsApp usFor urgent cold room breakdowns, call or WhatsApp to check technician availability for your site.
FAQ
Questions about this fault
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Cold Room Controller Fault — book a repair
Contact us to check technician availability for your site in Sandton. Send your machine make, model and fault description and we will advise on the next step.