Quick Answer: Most heat pump problems come down to poor maintenance or worn-out parts. Regular servicing every 12 months keeps your heat pump running efficiently, prevents costly breakdowns, and can extend its lifespan by 5+ years. If your heat pump is not heating, blowing cold air, or making strange noises, it likely needs professional repair.
What’s in This Guide
- Signs Your Heat Pump Needs Repair
- Heat Pump Maintenance Checklist
- Heat Pump Repair Costs in NZ
- How Often Should You Service Your Heat Pump?
- Why Choose Weka Electrical
- FAQs
Signs Your Heat Pump Needs Repair
Catching heat pump problems early saves you money and keeps your home comfortable year-round. Here are the most common warning signs that your heat pump needs professional attention.
Heat Pump Not Heating (or Not Cooling)
If your heat pump is not heating your home properly, the most common causes include low refrigerant levels, a faulty reversing valve, or a blocked outdoor unit. Sometimes the fix is as simple as checking your remote settings, but if the unit runs without producing warm air, you need a qualified technician to diagnose the issue.
Blowing Cold Air in Heating Mode
A heat pump blowing cold air when set to heat mode often points to a defrost cycle problem, low refrigerant charge, or a faulty compressor. In Wellington’s cold winters, this is the last thing you want. Do not ignore it, as running a heat pump with low refrigerant can cause permanent compressor damage.
Strange Noises
Grinding, rattling, or squealing sounds typically indicate loose components, worn bearings, or debris caught in the fan. A clicking sound during startup is normal, but persistent unusual noises during operation mean something is wrong internally.
Ice Buildup on the Outdoor Unit
A thin layer of frost on your outdoor unit during winter is normal and should clear during the defrost cycle. However, thick ice buildup that does not melt suggests a failing defrost timer, low refrigerant, or restricted airflow. Left untreated, ice can damage the compressor and coils.
Unpleasant Smells
Musty or mouldy smells coming from your heat pump usually mean the filters, coils, or drain pan need cleaning. A burning smell is more serious and could indicate an electrical fault. Turn off the unit immediately and call a licensed electrician.
Unusually High Power Bills
If your electricity bill has jumped without a change in usage, your heat pump may be working harder than it should. Dirty filters, refrigerant leaks, or failing components all reduce efficiency and drive up running costs.
Heat Pump Maintenance Checklist
Regular heat pump maintenance is the single best way to avoid expensive repairs. Some tasks you can do yourself, while others require a qualified technician.
DIY Maintenance Tasks (Every 2-4 Weeks)
- Clean or replace filters: Slide out the front filters and wash them with warm soapy water. Let them dry completely before reinserting. Clogged filters are the number one cause of reduced performance.
- Wipe down the indoor unit: Use a soft cloth to remove dust from the vents, louvres, and casing. Do not use harsh chemicals.
- Clear the outdoor unit: Remove leaves, grass clippings, and debris from around the outdoor condenser. Keep at least 50cm of clear space on all sides for proper airflow.
- Check the remote batteries: Weak batteries can cause inconsistent operation and error codes.
- Inspect the drain line: Make sure the condensate drain is not blocked. A clogged drain can cause water leaks inside your home.
Professional Maintenance Tasks (Annual Service)
A professional heat pump maintenance service covers everything you cannot safely do yourself:
- Refrigerant level check: Low refrigerant means reduced heating/cooling capacity and higher power consumption. Only a licensed technician can legally handle refrigerant in New Zealand.
- Electrical connection inspection: Checking wiring, capacitors, contactors, and control boards for wear or damage.
- Coil cleaning: Deep cleaning the evaporator and condenser coils to restore heat transfer efficiency.
- Compressor performance test: Measuring amp draw and pressures to ensure the compressor is operating within specifications.
- Thermostat calibration: Verifying the temperature sensor reads accurately so your heat pump heats and cools to the correct temperature.
- Fan motor and bearing inspection: Checking for wear that could lead to noisy operation or failure.
Heat Pump Repair Costs in NZ
Understanding typical heat pump repair costs helps you budget and decide whether repairing or replacing your unit makes more financial sense.
| Repair Type | Typical Cost (NZ$) | Timeframe |
|---|---|---|
| Diagnostic call-out | $80 – $150 | 30-60 mins |
| Filter clean & basic service | $120 – $200 | 1 hour |
| Refrigerant top-up | $200 – $400 | 1-2 hours |
| PCB / control board replacement | $400 – $800 | 1-3 hours |
| Compressor replacement | $1,200 – $2,500 | Half day |
| Full coil replacement | $800 – $1,800 | Half day |
| Fan motor replacement | $300 – $600 | 1-2 hours |
Prices are indicative and vary by brand, model, and location. Contact us for an accurate quote.
When to Repair vs Replace Your Heat Pump
Use this general rule: if the repair cost exceeds 50% of a new unit’s price, or your heat pump is over 12-15 years old, replacement is usually the better investment. Newer models are significantly more energy efficient, which means lower running costs from day one.
Other signs it is time to replace rather than repair:
- Frequent breakdowns (more than 2 repairs in 12 months)
- R22 refrigerant system (this gas is being phased out and is expensive to source)
- Noticeable drop in heating or cooling performance even after servicing
- Your energy bills keep climbing despite regular maintenance
How Often Should You Service Your Heat Pump?
The short answer: at least once a year. But the ideal schedule depends on your usage, location, and environment.
| Task | Frequency | Who |
|---|---|---|
| Filter cleaning | Every 2-4 weeks | Homeowner |
| Outdoor unit clearance check | Monthly | Homeowner |
| Full professional service | Annually (autumn) | Technician |
| Deep coil clean | Every 2-3 years | Technician |
| Refrigerant check | Annually | Technician |
Wellington-Specific Maintenance Advice
Wellington’s unique climate creates extra challenges for heat pumps that homeowners in other parts of New Zealand do not face:
- Salt air exposure: If you live near the coast (Lyall Bay, Island Bay, Seatoun, Oriental Bay), salt spray accelerates corrosion on outdoor units. Consider a blue fin or gold fin coated unit, and rinse the outdoor unit with fresh water every few months.
- Wind debris: Wellington’s notorious winds blow leaves, dust, and debris into outdoor units more frequently. Check and clear your outdoor unit at least fortnightly during autumn and winter.
- Temperature swings: Wellington can go from mild to freezing quickly. Make sure your heat pump’s defrost cycle is working properly before winter hits. Book your annual service in March or April to get ahead of the rush.
- Humidity and mould: Wellington’s damp climate means your heat pump’s indoor unit is more prone to mould growth on the coils and in the drain tray. A professional anti-bacterial treatment during your annual service prevents musty smells and health issues.
Why Choose Weka Electrical for Heat Pump Repairs
When your heat pump stops working, you need it fixed fast and fixed right. Our team of licensed electricians and heat pump technicians have been keeping Wellington homes comfortable for years. Our heat pump installation and repair service in Wellington covers all major brands including Mitsubishi Electric, Daikin, Fujitsu, Panasonic, and Haier.
- Same-week service: We understand a broken heat pump in a Wellington winter is urgent. We prioritise repair call-outs and aim to get to you within days, not weeks.
- Upfront pricing: No surprises. We provide a clear quote before starting any work, including parts and labour.
- Licensed and insured: All our technicians are registered electricians and qualified heat pump installers.
- All brands serviced: Whether you have a Mitsubishi, Daikin, Fujitsu, Panasonic, or any other brand, we can diagnose and repair it.
- Maintenance plans available: Book annual servicing to keep your unit running efficiently and catch problems before they become expensive.
Frequently Asked Questions
How much does a heat pump service cost in NZ?
A standard annual heat pump service typically costs between $120 and $200 in New Zealand. This includes filter cleaning, coil inspection, refrigerant pressure check, and electrical testing. More extensive repairs like refrigerant top-ups or part replacements are quoted separately.
Why is my heat pump not heating my house?
The most common reasons a heat pump is not heating include dirty filters restricting airflow, low refrigerant levels, a faulty reversing valve, or incorrect thermostat settings. Start by cleaning your filters and checking the remote is set to heat mode. If that does not fix it, call a technician to check the refrigerant levels and internal components.
Can I service my heat pump myself?
You can handle basic maintenance like cleaning filters, wiping down the unit, and clearing debris from the outdoor unit. However, anything involving refrigerant, electrical components, or internal coils should only be done by a qualified technician. Working with refrigerant requires a licence in New Zealand.
How long do heat pumps last in NZ?
A well-maintained heat pump typically lasts 12-15 years in New Zealand. With regular professional servicing and consistent filter cleaning, some units last up to 20 years. Coastal homes in areas like Wellington’s south coast may see slightly shorter lifespans due to salt air corrosion.
What does a heat pump service include?
A professional heat pump service includes cleaning or replacing filters, deep cleaning the evaporator and condenser coils, checking refrigerant levels and pressures, testing electrical connections and components, inspecting the drain line, verifying thermostat accuracy, and checking the defrost cycle. Some technicians also apply anti-bacterial treatments to prevent mould.
Is it worth repairing an old heat pump?
Generally, if the repair cost is more than half the price of a new unit, or if your heat pump is over 12-15 years old, replacement is the better option. Newer heat pumps are significantly more energy efficient, so the savings on your power bill can offset the higher upfront cost within a few years.
