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Air conditioning - Any recommendations please??

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Old 18-02-2017, 10:29 AM   #9331
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Hello, it be could pcb problem, could also be the thermometer problem. Or there is an issue w the expansion valve. Just a few guesses. Might need to get someone to check.

Hi All,

I am seeking help from aircon experts here as I am out of ideas already. I am having problems with my 6 years MHI aircon.

All 3 fancoils shut down together after 1-2 hours. Error light blinking. Switch it on again and it switches off again after 1-2 hours. Keeps repeating.

Is it the fuse or fan or motor or pcb?

Any suggestions from anyone? Any clues to the problem, please? Thanks!!!
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Old 18-02-2017, 10:30 AM   #9332
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Hello! Personally I wouldn't say LG is the best. Family friend who is an aircon technician was saying Mitsubishi is not bad. You can take a look !

im currently shopping for a aircon for my bto 4 rm and LG current offer stood out the most. anyone got bad things to say about their LG aircons in general?
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Old 18-02-2017, 01:23 PM   #9333
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Hello, it be could pcb problem, could also be the thermometer problem. Or there is an issue w the expansion valve. Just a few guesses. Might need to get someone to check.
Thank you so much for your reply. May I ask if you know how aircon specialist check the condenser? Is it just a visual check that can be done? I got aircon service and the guy open up the cover and look in and then said nothing is wrong. It looks compact inside, don't one have to hold up some parts and do technical check?
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Old 18-02-2017, 05:13 PM   #9334
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Nowadays, the fan speed will varies too as its an inverter unit.
Best to get a technician to assess it.

Thanks for you prompt reply.

Actually even if only 1 unit is on, the noise level vary from time to time.

But if I on more units, confirm louder.

But I did stand by the window to see the outdoor compressor unit, the noise starts when the fan operates. However, I think the fan operates only when the compressor operates.

Does fan speed changes?

Thanks in advance!
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Old 20-02-2017, 08:44 AM   #9335
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Hi, I've gotten 2 quotes of the same price from 2 companies but the materials they use vary slightly. Can anyone advise which would be a better choice?

1. Copper pipes SWG 21 + 1/2" Kemflex, combination of 13mm and 16mm PVC drainage pipes (no insulation)

2. Copper pipes SWG 22 + 1/2" Armaflex, 16mm PVC drainage pipes (with 1/4" insulation)
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Old 20-02-2017, 01:06 PM   #9336
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im currently shopping for a aircon for my bto 4 rm and LG current offer stood out the most. anyone got bad things to say about their LG aircons in general?
my sister in law got bad dream from LG aircon. now change to mitsubishi electric so far so good
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Old 20-02-2017, 01:14 PM   #9337
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Hi, I've gotten 2 quotes of the same price from 2 companies but the materials they use vary slightly. Can anyone advise which would be a better choice?

1. Copper pipes SWG 21 + 1/2" Kemflex, combination of 13mm and 16mm PVC drainage pipes (no insulation)

2. Copper pipes SWG 22 + 1/2" Armaflex, 16mm PVC drainage pipes (with 1/4" insulation)
I just done my aircon works. here is something i can share with you:

the minimum standard of copper pipe is G23, normally upgrade to G22 is good enough I think. my husband said no point to use even more thicker copper pipe if the installer didn't do well. for my new house design, almost all trunking are hide inside cabinet and ceiling. so we decide to use G22 and 1/2" thickness Armaflex to minimize the future problems.

as my aircon contractor told me, there's different Class for Armaflex. and she show me the difference when they come down for site check.

if you decided go with 1/2" armaflex, just get Class 0 grade, and make sure the installers do the proper work. i saw some of my neighbour piping, works been short cut by installers, didn't give what they have promise at first.
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Old 20-02-2017, 02:07 PM   #9338
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Hi All,

I am seeking help from aircon experts here as I am out of ideas already. I am having problems with my 6 years MHI aircon.

All 3 fancoils shut down together after 1-2 hours. Error light blinking. Switch it on again and it switches off again after 1-2 hours. Keeps repeating.

Is it the fuse or fan or motor or pcb?

Any suggestions from anyone? Any clues to the problem, please? Thanks!!!
have to check which light is blinking and how many times blink. there's a page of error code on your user manual. you can check out or you can get a technician to check on but mostly tell you PCB problem.
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Old 20-02-2017, 05:50 PM   #9339
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I just done my aircon works. here is something i can share with you:
Hi,
I intend to change my house air-cond too. can you PM me the company that you buy & install from?

Thanks.
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Old 20-02-2017, 06:16 PM   #9340
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I just done my aircon works. here is something i can share with you:

the minimum standard of copper pipe is G23, normally upgrade to G22 is good enough I think. my husband said no point to use even more thicker copper pipe if the installer didn't do well. for my new house design, almost all trunking are hide inside cabinet and ceiling. so we decide to use G22 and 1/2" thickness Armaflex to minimize the future problems.

as my aircon contractor told me, there's different Class for Armaflex. and she show me the difference when they come down for site check.

if you decided go with 1/2" armaflex, just get Class 0 grade, and make sure the installers do the proper work. i saw some of my neighbour piping, works been short cut by installers, didn't give what they have promise at first.
Hi rainbowdreamer, can share your aircon company contact?
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Old 20-02-2017, 10:35 PM   #9341
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Can consider Daikin 3mks50fsg for system 3
Understand that the 3mks50fsg is only 18k btu. My 3 bedroom size range fr 150 to 170sqft. I intend to install 12k btu FCU for the 170sqft master bedroom and 2x9k btu FCU for the other 2 bedrooms. Will the 18k compressor be sufficient when all 3 bedrooms FCU are on at the same time? Thanks
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Old 21-02-2017, 12:05 AM   #9342
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Hi RainbowDreamer,

Im not an ezpert in aircons. But after reading about 30 to 40 pages on this thread. I finally made my mind on either Daikin or ME. Point is lots of users down here talks about ME a lot and the issues the face. But 1 thing I have to agree with them is that, if the installation is screwed up then no matter what brand we use its still useless.

If you don't mind sharing can you PM me which company you hire to do your aircon installation and how much does it cost you?

I'm planning to install system 4 for my house. Maybe 3x 9kbtu and 1x 12k but for my living room. Any advise. My house is about 19yrs old. No aircon bracket. I bought this on resale. It's 5room, 125sqft.
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Old 21-02-2017, 03:36 PM   #9343
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Experience sharing for an air con contractor (No naming and number )

Contractor A quote my parent 2.5k for ME System 2 with standard piping.
During site survey, parent wanted to install above room entrance but he insist FCU too big to install there. All other proposed FCU position difficult to do , only position nearest to compressor is ok.

Called him up to clarify with him on the quote and work. Told him others quote market rate of 2.3K for same model. Immediately he told me ok, price is negotiable just let him know what price i want.

Further probe on how he do the work, he insist copper pipe for both room will be insulated in one Armflex tube to reduce trunking size. He have done this many times and no problem so far.

Hearing that, i told him thank you and hang up the phone.

Found another contractor who came and installed the FCU above the room entrance with proper insulation done..

Last edited by keiichiro; 21-02-2017 at 03:47 PM..
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Old 21-02-2017, 04:36 PM   #9344
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150 sq ft requires around 7.5k btu.
When all 3 all on, the individual fcu BTU will auto decrease.
Whats the sq ft of the other 2 rooms?

Understand that the 3mks50fsg is only 18k btu. My 3 bedroom size range fr 150 to 170sqft. I intend to install 12k btu FCU for the 170sqft master bedroom and 2x9k btu FCU for the other 2 bedrooms. Will the 18k compressor be sufficient when all 3 bedrooms FCU are on at the same time? Thanks
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Old 21-02-2017, 04:38 PM   #9345
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5 room living room, 12k seems insufficient.
Need 22/24k btu.


Hi RainbowDreamer,

Im not an ezpert in aircons. But after reading about 30 to 40 pages on this thread. I finally made my mind on either Daikin or ME. Point is lots of users down here talks about ME a lot and the issues the face. But 1 thing I have to agree with them is that, if the installation is screwed up then no matter what brand we use its still useless.

If you don't mind sharing can you PM me which company you hire to do your aircon installation and how much does it cost you?

I'm planning to install system 4 for my house. Maybe 3x 9kbtu and 1x 12k but for my living room. Any advise. My house is about 19yrs old. No aircon bracket. I bought this on resale. It's 5room, 125sqft.
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