If you’re recognizing a odor from your heat pump, it’s attempting to tell you that something is wrong. We’ve put together a list of the most popular six heat pump smells, what causes them and how you can correct them.

  1. Heat pump smells musty
  2. Heat pump smells like fish
  3. Heat pump smells like sulfur
  4. Heat pump smells like sewer
  5. Heat pump smells like burning
  6. Heat pump defrost cycle smells

1. Heat Pump Smells Musty

If your heat pump smells musty, there’s most likely mold growing on moist evaporator coils or in the ductwork. This heat pump odor is often known as dirty sock syndrome. You can avoid this by scheduling routine heat pump maintenance and air duct cleaning.

2. Heat Pump Smells Like Fish

If your heat pump smells like fish, there could be a couple of things wrong:

  • Overheated motor
  • Wiring problems
  • Plastic components or coating is melting
  • Other mechanical issue

Electrical problems are serious, so turn your heat pump system off right away at the breaker box and get a hold of us at for heat pump repair.

3. Heat Pump Smells Like Sulfur

Usually when you have a rotten egg smell, you have a gas leak. But your heat pump doesn’t utilize natural gas. If your heat pump smells like sulfur, a small animal may have gotten inside it for warmth and died. One of our Street Heating and Cooling experts can remove the smell by cleaning your heat pump.

4. Heat Pump Smells Like Sewer

As we mentioned above, your heat pump is electric, so any rotten egg smells are connected to a gas leak somewhere else. If your heat pump smells like sewer, you might currently have a backed-up or broken sewer line. We recommend contacting a company that does sewer line repair.

5. Heat Pump Smells Like Burning

You might have an electrical problem if your heat pump smells like burning, burning plastic or burning rubber. This burning smell can be caused by melting plastic on electrical wires. Electrical issues in HVAC systems are unsafe and could cause a fire. If you notice this smell, turn off your heat pump at the breaker and contact us at .

6. Heat Pump Defrost Cycle Smells

Like we mentioned earlier, a dirty socks smell can happen when your evaporator coils need cleaning. You might encounter this smell when your heat pump is in defrost mode.

It’s ordinary for your heat pump to have to use defrost mode during heating season. When the air is much colder, frost can form fast on the coils from condensation and impede heating. During defrost mode, your heat pump shortly switches to ac to clear away the frost.

Having a Street Heating and Cooling HVAC technician clean the coils will help get rid of the odor.

Depend on for Your Heat Pump Repair Needs

It can be confusing to troubleshoot your heat pump by yourself. Your comfort matters to us at Street Heating and Cooling, so you can count on our specialists to help you when you need us. When you need heat pump repair in that you can count on, call us at .