If you’re noticing a smell from your heat pump, it’s trying to tell you that something is wrong. We’ve created a list of the top six heat pump smells, what causes them and how you can repair 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. The Heat Pump Has a Musty Smell

If your heat pump smells musty, there’s likely mold growing on damp evaporator coils or in the ductwork. This heat pump odor is often referred to as dirty sock syndrome. You can deter this by scheduling regular heat pump maintenance and air duct cleaning.

2. The Heat Pump Smells Like Fish

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

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

Electrical problems are unsafe, so shut your heat pump system off immediately at the breaker box and call us at 215-741-5505 for heat pump repair.

3. The Heat Pump Smells Like Sulfur

Usually when you are dealing with a rotten egg smell, you’ve got a gas leak. But your heat pump doesn’t utilize natural gas. If your heat pump smells like sulfur, a small animal may have creeped inside it for warmth and died. One of our Indoor Comfort Systems HVAC technicians can eliminate the smell by cleaning your heat pump.

4. The Heat Pump Has a Sewage Smell

As we reviewed earlier, your heat pump is electric, so any rotten egg smells are tied to a gas leak elsewhere. If your heat pump smells like sewer, you might have a backed-up or broken sewer line. We advise getting in touch with a company that does sewer line repair.

5. Your Heat Pump Smells Like Burning

You might have an electrical issue 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 serious and could lead to a fire. If you notice this smell, turn off your heat pump at the breaker and contact us at 215-741-5505.

6. Why Your Heat Pump Defrost Cycle Smells

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

It’s common for your heat pump to have to turn on defrost mode during heating season. When the air is much cooler, frost can form rapidly on the coils from condensation and interfere with heating. During defrost mode, your heat pump shortly switches to ac to clear away the frost.

Having a Indoor Comfort Systems HVAC HVAC technician clean the coils will help get rid of the odor.

You can Count on Us for Your Heat Pump Repair Needs

It can be hard to troubleshoot your heat pump by all by yourself. Your comfort matters to us at Indoor Comfort Systems HVAC, so you can count on our professionals to support you when you need us. When you need heat pump repair in Croydon that you can rely on, call us at 215-741-5505.