Mitsubishi Mini Split
 

I have a mini split in my lanai that needs service. It was installed about 6 years ago and cools and heats perfectly except now it has started to hum intermittently, sometimes hours after the unit has been turned off. I've had one what I believe to be an outrageous estimate to replace the pump. Has anyone had experience with companies servicing these units and can give me a recommendation so I can get another estimate? Thanks for any advice.

Obviously the place it was purchased but sounds like you probably already tried that company. Unfortunately we live in a “throw away world” where it’s easier and many times less costly to replace instead of repair. I would try any company that sells and installed one. Good luck.

It is most likely that you have a bad capacitor. The part retails for 18.00 or so. I have replaced these myself. It is simple. You should pay a service call and whatever they charge for the capacitor.

Call during business hours for a non priority service call. It should cost approximately 150.00

It sounds like you may need a new condensate drain pump located in the inside unit. The pump will run even after the unit is turned off. You can buy one online for about $250, but you would probably need an HVAC technician to install it.

I recommend that you call Kalos for service, 352-243-0799. They installed my Mitsubishi about a year ago and I trust them for service.

I took my pump off and let gravity do the work.

OP, that sounds like a good idea to stop the humming noise, if you can drain the condensate line to the outside and either remove or disconnect the pump.

I had issues with my mini split also and found Daniels heating and A/C to be very good. They are authorized Mitsubishi dealer located near Inverness. They do many jobs in The Villages. Saved me $$ compared to the others.
Phone 352-726-5845

We use Munn’s for all our AC work.

We use Munn’s for all our heating & AC work.

Munn's

Sun Kool

Sunshine Air Conditioning

These are the main players in TV.

Try calling Eric Sword, Sword Heating and Air, 352 434 7550. Have been using him for years. If he can’t help you, he will tell you. Honest, courteous and professional.

My Mitsubishi mini split, installed a few years ago by Munns, has a 10 year parts and labor warranty, including the condensate pump. In case you haven't checked, perhaps you are still covered by a warranty?

Apparently, the pump is not a Mitsubishi part and does not have the same 10 year warranty. This according to Munns.

Thanks everyone. I knew I could get good info on this site.

I can't speak for yours, but my condensate pump has a 10 year parts and labor warranty, according to Munns, in writing. I have no doubt that it is not a Mitsubishi part. Who Munns get reimbursed from for warranty repairs, if anyone, is of no interest to me. I would not call Mitsubishi for a warranty repair - I would call Munns, their authorized dealer.

Good luck same thing happened to mine. Compressor. $$$

Capacitor. If it was a condensate pump issue the unit would be flooding inside your home.

It was Munns who told me it was the pump. I will definitely get another diagnosis and quote.

Try Sun Kool. We have been using them to service our main A/C unit for 15 years and they installed our new A/C last year and installed our mini split A few years ago. We find them to be honest and knowledgeable. I'm sure they could look at yours and advise you.

For the record you do not have a ten year warranty, you have a one year warranty with a nine year extended warranty which IS NOT from the OEM. The point of me mentioning this is the extended warranty, a contract, can cover non Mitsubishi parts. Read your service contract which was mailed to you approximately four weeks after the installation.

The premium for this extended warranty was built into the original price. In today's dollars it added about $265.00 to the price. You can/could of opted out of it.

Perhaps you have an Aspen mini white pump
 

Check that model out in Amazon to see if that is the one you have. They cost about $160 for a replacement pump. They are easy to replace. They also require periodic maintenance at 6 month intervals. Remove the front cover, unclip the reservoir and clean with a bacterial cleaning solution. Your problem may be that the float is stuck in the up position causing it to run continuously. Clean the float and install with the magnet facing upwards on the float retainer.

Mini-split Service
 

I use Tropic Air Solutions. Father and Son Bruce and Cory have taken good care of mine.
352-321-6656

Try to find out which company installed the mini-split by checking with your County's buildings dept. since a permit would have been needed. That company can then inform you of the warranty on your unit. I use Munn's for the maintenance on my home HVAC system and United Refrigeration in Ocala (aka United Heat & Air) for my Mitsubishi mini-split. I have been happy with both companies.

It sounds like the condensate line the pump pumps into may be plugged causing the pump to continue running. You may want to consider having the unit cleaned and checked. Check drain lines, check drain pan, check outside where the line drains out may be plugged with grass or dirt causing the blockage. On some of these systems the pumps were located above the ceiling in the attic space making it difficult to service. You can call DeSantis HVAC service 352-330-4433.

Thanks so much. The unit has been serviced - twice since it started to hum.

Where does it hum?

If it is inside it is not the capacitor.

Munn’s Electric