How to clean your heat pump - Consumer NZ
Getting the best out of your heat pump only takes a vacuum cleaner and a few minutes of your time.
At this time of year, you’ll often see flyers and adverts flogging heat pump servicing. Don’t do it. You can do your own clean and check in less than 10 minutes, and probably save yourself at least $100 in the process.
It all comes down how often you run your heat pump. If you use it sparingly in winter, then you can probably get away with once a year. If you use it a lot throughout summer and winter, you should be thinking at least 4 times a year.
Indoor unit clean
Grab your vacuum and clip on the dusting brush attachment – if you don’t have one, chuck on the upholstery tool and make sure the vacuum power is dialled back a touch. Flip up the heat pump cover and remove the filters (usually they’re pretty clogged up with dust if you haven’t cleaned them for a few months). Vacuum the filters with the brush attachment before passing the vacuum over the vanes and fins inside the heat pump itself. Pop the filters back in place and flip down the cover, then wipe down the outside of the unit.
Check around the outdoor unit to make sure there’re no vegetation growing in the vicinity and that nobody’s left anything leaning against it. If there’s anything growing close to the unit, trim it right back or remove it. Now you can take a close look at the outdoor unit itself, look for any signs of insect nests or evidence that there’s some colony present – think ants and cockroaches. You’ll probably be able to treat the problem yourself, but for big jobs you might be better off calling in an exterminator.
Now look for signs of corrosion. If you see something, you should deal with it – or get it dealt with – to extend the life of the heat pump.
Don’t worry if there’s a bit of water on the ground by the outside unit. That’s normal and exactly where you want the water to be. If it’s inside the house, you have a problem.
Head back inside and turn the heat pump on. Have a listen to make sure everything sounds fine and that there is a good amount of heat coming from the unit – you’ll notice a big jump in performance if your filters were particularly clogged. Pop outside and do the same with the outdoor unit, and from there you’re good to go.
When to call in the technician
You can still call the pros every few years for a servicing if you want that peace of mind that everything is running well, as they’ll run some diagnostic checks at the same time. Other than that, the only time you’ll need a technician is when the heat pump actually develops a fault. It’ll be clear that you have a problem if you notice strange noises, leaking inside or poor performance after cleaning the filters yourself.
I have discovered mould can grow in the internal unit on the inner surfaces, on the fan blades and heat exchanger grills leading to bad smells and possibly a health hazard. Cleaning is very difficult involving partial disassembly of the wall mounted unit and specialized grill foam sprays. Good luck finding a repair guy it's DIY.
When I had that problem I ran the coil dry setting. That solved it.
Not so easy to access filters when the heat pump is high on a wall. Even standing on a chair (and I’m tall), quite tricky to reach up to open the cover & get the filters out. I’m 70+ and fairly agile but there will come a day when I will have to pay someone to clean the filters for me.
Prabandha K & Choudhury S.
DIY HEAT PUMP CLEANING
Great tips including vedio DIY. Also timely reminder - thanks.