Heat pumps · Priority

Heat Pump Icing Up

Ice forms on the evaporator coil and does not clear between cycles.

This fault is normally treated as priority work because the plant is still running but is damaging itself or wasting energy while it does.

Where a site runs on borehole water, hardness and iron content shorten service intervals considerably and are worth testing before setting a maintenance plan.

069 268 0988 info@reyds.co.za

Equipment: Heat pumps
Priority: Priority
Call: 069 268 0988

What we find

Likely causes

Defrost sensor or board failure
Low refrigerant charge
Restricted airflow from a dirty coil
Fan motor running slow or intermittently
Unit sited in a cold, unventilated position

Test sequence

How we diagnose it

Observe a full defrost cycle
Check defrost sensor resistance
Airflow and coil condition inspection
Charge verification

Repair route

Services that resolve this fault

Heat Pump Repairs

Fault-finding and repair of air-source hot water and pool heat pumps.

Industrial Heat Pump Repairs

High-capacity and cascade heat pump repairs for plants and process water.

Commercial Heat Pump Repairs

Hotel, guesthouse, gym and complex heat pump repairs with minimal downtime.

Heat Pump Maintenance

Scheduled servicing that keeps COP high and prevents compressor failure.

Heat Pump Installation

Sizing, plumbing, electrical and commissioning for new heat pump plant.

Heat Pump Regassing

Leak detection first, then correct-charge regassing by weight.

Heat Pump Troubleshooting

Structured diagnostics for intermittent and error-code faults.

Commercial Heat Pump Regassing

Leak repair and charge correction on multi-unit commercial plant.

Coverage

Attendance by area

Also check

Related faults

Heat Pump Not Heating Water

The unit runs but water stays cold or only reaches lukewarm temperatures.

Heat Pump Keeps Tripping the Breaker

The circuit breaker or earth leakage trips shortly after the heat pump starts.

Heat Pump Leaking Water

Water pooling under or around the unit, sometimes continuously.

Heat Pump Making Noise

Rattling, grinding, screeching or loud humming during operation.

Heat Pump Compressor Fault

The compressor will not start, hums and trips, or cuts out on overload.

Heat Pump High Pressure Fault

The unit locks out on a high pressure error, often after running for a while.

FAQs

Frequently asked questions

What causes heat pump icing up?

The usual causes are defrost sensor or board failure, low refrigerant charge, restricted airflow from a dirty coil, fan motor running slow or intermittently. Which one it is can only be confirmed by measurement, not by symptom alone.

How do you diagnose it?

Observe a full defrost cycle; Check defrost sensor resistance; Airflow and coil condition inspection; Charge verification. The readings are recorded so the repair decision is based on data.

Can I keep using the system in the meantime?

Usually yes, for a short period, but efficiency and component life are both being lost while the fault persists.

Where do you attend this fault?

Across Johannesburg, Ekurhuleni, West Rand, Midrand, Centurion and Pretoria.

Get heat pump icing up diagnosed

Priority attendance across Johannesburg, Ekurhuleni, West Rand, Midrand, Centurion and Pretoria.

069 268 0988 Request a quote