Component repair
Cold Room Defrost System Repairs in Sandton
Defrost systems melt ice off the evaporator so it can keep cooling. In freezer rooms and humid cold rooms, a failed defrost system is the most common cause of ice build-up and temperature loss.
What this component does
Defrost systems melt ice off the evaporator so it can keep cooling. In freezer rooms and humid cold rooms, a failed defrost system is the most common cause of ice build-up and temperature loss.
Common symptoms
- Ice build-up on the evaporator
- Room temperature rising
- Water leaking from the unit
- Compressor running continuously
- Defrost not running or incomplete
Common causes
- Failed defrost heater
- Defrost timer or controller schedule fault
- Defrost termination sensor fault
- Failed defrost contactor or relay
- Drain blocked or frozen
- Insufficient defrost frequency for conditions
Our diagnostic process
Defrost diagnosis checks heater continuity and operation, the defrost schedule, the termination sensor, the drain line and the drain heater. Ice build-up has several causes within the defrost system, and each needs a different repair. We diagnose before defrosting.
Repair options
Repair options include defrost heater replacement, defrost schedule correction, termination sensor replacement, drain clearing and drain heater repair, and contactor or relay replacement. We also adjust defrost frequency to suit the room conditions.
When replacement may be necessary
Where a defrost heater has failed and the coil has frozen solid, the heater is replaced and the system is allowed to defrost fully before restart. Repeated defrost failures may indicate a coil or controller issue requiring broader repair.
Preventative maintenance
Defrost system checks at every service visit are the most important maintenance task for freezer rooms. Drain lines must be kept clear to prevent water freezing in the drain.
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 component
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Cold Room Defrost System Repairs — 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.