Rust on Mitsubishi Mini Split Evaporator Coil

[LG63]

Is this amount of rust on the coil end plate normal? This is after 3 seasons of primarily A/C use. The unit works great, no other issues. I only noticed because I had it apart for cleaning.

 

[gmcgeo]

Evaporator Coil Leaks Caused by Corrosion

Bryant specializes in air conditioning, heating, and plumbing services in Lincoln, NE | Evaporator Coil Leaks Caused by Corrosion

bryantlincoln.com

thats a good read on evap coils and corrosion

 

[chrispyny]

In comparison to my 24kbtu fuji i installed 5 summers ago, and my 18kbtu pioneer i installed 4 summers ago, yours looks Horrible. i have zero corrosion on both mine. Sure the copper isnt shiny anymore but thats it. That looks like a defect in materials UNLESS you live on or near salt water. Then all bets are off. Good luck.

 

[LG63]

In comparison to my 24kbtu fuji i installed 5 summers ago, and my 18kbtu pioneer i installed 4 summers ago, yours looks Horrible. i have zero corrosion on both mine. Sure the copper isnt shiny anymore but thats it. That looks like a defect in materials UNLESS you live on or near salt water. Then all bets are off. Good luck.

Yeah I was afraid of that. Oddly it still performs great so it must not take much of a leak to start the corrosion process. I guess the next step is to see what, if any warranty applies.

 

[finn]

What’s that other thing at the top of the picture that’s also corroded?

Sure you don’t have something dripping on the unit perpetually?

 

[LG63]

That's the bracket that attaches the coil to the plastic housing. This is in a living area so no corrosives coming from the environment that I can think of. The summer months are humid and it does produce a lot of condensate so I suspect the coil is continually wet. Seems like that would be a very common situation though.

 

[Jim greengo]

I'd guess it was **** plating on the steel with condensation sitting on it.
I've seen lots of older A coils in split systems do that that weren't leaking.

 

[LG63]

I'll be thrilled if it's just crappy plating. Was hoping for an explanation other than a leak.

 

[jjrbus]

What brand is the mini??

 

[finn]

What brand is the mini??

The title says Mitsubishi.

 

[Terry D]

I think corrosion will eventually cause a leak, not a leak will cause corrosion.

 

[Jackfre]

I would call Mitsu’s tech dept. Demand a case number so it is documented that there is a problem. That can give you some leverage on extending the warranty.