Mitsubishi Mini Split Head loud clicking
I was doing a cleaning service on a Mitsubishi mini split system and the owner pointed out that one of the heads will make a loud "Snap" during the night. The timing seems random but happens even with the head off (system on). it is particularly troublesome because it trigger his dog. even if the dog is in a different room.
The problem was addressed in February by a Mitsubishi Elite contractor that replaced the POWER P.C. BOARD, which reduced the noise frequency buy %80, by the customers estimate. but it still exists.
The customer recorded audio overnight and extracted this clip. I would describe what I hear as a knock then a loud snap, and then the knock again. The snap sounds like a contactor to me. listen to the attached file please.
The Heads is MSZ-GL12NA manufactured in 2017 part of a two head system using a branch box.
Also, the head has an older drain pan safety switch I have not seen before instead of interrupting power or communications, it interrupts one of the coil thermistor wires. strange to me…
Comments
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expansion contraction
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what is expanding and Contracting? I've installed a lot of Mini Splits and I've also cleaned a lot of heads and fixed a few here and there. I have never heard of this happening. If the head were starting up and shutting down I could see maybe there would be some expansion and contraction. But this is with the system off at random times during the night.
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the copper tubing through the galv sides.
how oversized is this head?1 -
Check for miswired head A to B instead of A to A.
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to be honest, I have not done a heat loss etc but its a 12k head serving the the upper floor on what my guess is a 2000 sqft house
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this system is at least 10 years old and the heads run correctly
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the head run constantly or the fan runs constantly?
mini split fans run 24 seven
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Im not sure I understand what you mean. The head and the fan do not run constantly when the head is turned off. And the fan doesn't run 24/7 when the head is turned off. When the head is turned on in any mode, of course the fan is running.
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is this a new development
My thought is it may be the way the unit is mounted, I had a different brand unit that made a few popping sounds and it turns out the mounting bracket was on so tight it had bent slightly backward (bowed slightly) when they changed the PCB they probably had to take the cover off which may have slightly relieved the bracket. just a guess of course! but if the fan isnt on I highly doubt its anything like that
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That's a good point, I haven't had this particular problem but have seen a few problems associated with mounting . Ran into a condensate leak problem that ended up being an un even wall causing the drain pan to bow. shimming the mounting bracket so that it was flat fixed it.
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to answer the first part of you responce, the owner has been in the house about a year. it been here since he has been here.
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Is this a new install?
Again what size head and how many Sq Ft?
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I don't know the exact size but Like I said, "The Heads is MSZ-GL12NA manufactured in 2017"
its probably a 2000 sqft house. this head is the only head on the upper floor.
so the head was made in 2017 probably not a new install.
lets just say it is oversized, whats your point?
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