I got tons of knowledge from your videos, very appreciate. I have some experience to fix this type of issue, the red wire, and the white wire at the terminal board, compose of the communication lines between indoor and outdoor, they should have PWM signals when setting at DC voltage. There is an open circuit at the implanted power switch on the board, check DC voltage at the power switch and trace the PCB, you should find a component "O.L.", you may check a few resistors, diodes and a Voltage Regulator in the loop.
I just installed a 2 ton Fijitsu mini-split last weekend, and was literally praying I would not have to trouble shoot it till I got done watch'n this video!
Hey Chris, mini splits are only as hard as you make them!!!! Always remember if you get stuck on one you can always call the manufacturer, as a matter of fact they want you to call them. Thanks for watching
This is super helpful thanks. I broke the CN3 (RT64 thermistor) wire on the power board with the capacitors on it. What's the best way to change that board out? Do I have to remove this front board first? Thank you.
I think the problem on the board is ZD 652, there is a cold soldering you can see that the print is dark around the soldering , maybe changing zener diode and / or soldering it again Regards Niels
I really wanted to get a video on the first control board I installed but by the time I got there to do the job it was dark and I had to install it by using a flash light. I was bummed out because I didn't get to film it. So this video does prove they do break and you might come across one. Thanks for watching, I'm glad I could help
nice job on Mitsubishi here in North Canada we get lots of power issues surges outages and I do lots of boards still customers don't want surge protectors go figure what about there?
Hey Ray I'm one of those guys that learn from watching, that's why I like RUclips!!!! I've learned a lot from the other guys as well. Also reading peoples comments help too
Hi guys, the noises on power up are the exv( electronic expansion valves ) opening.E6 fault? He'll there are so many things that can fail, the c&n 801 pink plug should have 325- - dc .Then the fuse f64 behind the front if blow would mean the power board has failed. Near this fuse are white resistors 10 ohms 5w . Make sure you check them and again the left power board would fail these.On the power board with three blue caps- red probe to n and black to p(yes) power off there should be hi resistance in k ohms and between u v w, not low ohms.Check those exv ,s are not corroded on valve stems- it will blow out resistors where they plug in.If a exv fails and no spares 2 curved magnets will open it turned like a tap. C/w shut and cc/w openHope I've helped somebody .Roy in nz
So why exactly would the corrosion on the exp valve cause it to blow the resistors. Are these resistors controlling the exp valves or is the valve remaining shut and causing high pressure on the compressor and therefore overloading the drive circuitry that the resistors are part of? Very curious thanks.
2 boards in one month? Wow, how much do these boards cost and what is the average labor cost to perform the repair if not covered by the warranty? Is this a common problem and if not what do you think is causing this frequent failure of the control board thank you in advance!
Ha man like the vid.. I do see these mini spits down in Florida. I wrk on them sometimes but I like the technical part. So now I no if I run in this problem I will have your video saved. Thks for the advice and the lesson.
Can you help me, my 18 k is ok but the two 9k are not communicating with the out door unit I can turn them on with the remote the luvers open and the fan comes on. What is the most likely cause on the pproblem? cheers Walter
I accidentally wired the active cable for my main power in to a signal terminal where the sdi cable goes. Is there a high chance I would've blown the board? My ac split system runs but it doesn't cool..it's pretty much a fan lol
T&N Services LLC. Ralph do you know if Mitsubishi makes a unit that can handle the cold up my way? I know we're installing a mini-split heat pump in a enclosed porch but I think it's a Fuji.
you will die when you see how big the building is. I've got a video on the building, I was driving by it one day. I might check on going to the M&P class myself as a refresher as a diamond contractor they give us one class a year for free.
Hi t&n , check those expansion valve and stems for corrosion. Swap unused for the two circuits in use. Just a thought after you replacing the board more than once.(:
Hi, I mean if you thought electronic expansion valves were,t opening on power up and may be or giving problems you could use spare un used from indoor circuit d. Swap the head and plug. They are at the bottom back.
I so do not like circuit boards. They're always way too expensive. The companies go out of business or the company changes to a different board or stops making that board or every electric issue causes a problem and you can't get anywhere with the utility company or you have to call a 1-800 number for technical assistance and after an hour of fustration talking to some guy in india decifering his english you get nowhere. Why do you need them. I've come across older AC systems on restaurants that have obsolete circuit boards, I removed them and installed a compressor contactor, a blower contactor a time delay a 24v transformer and a new thermostat...easy...strong and works long term like a refrigeration system and I didn't have to take a $1500.00 course to work on the units circuit boards. Sorry for the rant, I drank too much coffee, I have to go fix a bakery freezer. (no circuit board) My glycemic level goes up just smelling the confectionary sugar there, it's a sweet job.
If I was King for a day I'd outlaw circuit boards, and louvers on AC condensers, and gold toothed sun tanned golf sweater wearing maintence contract salesmen who take your customers on Jan 1 when you need them the most, after taking care of them all summer.
I know this is a older video, but it gives one of the best explanations of how each board gets its power. And what each board does. Thank You
I got tons of knowledge from your videos, very appreciate. I have some experience to fix this type of issue, the red wire, and the white wire at the terminal board, compose of the communication lines between indoor and outdoor, they should have PWM signals when setting at DC voltage. There is an open circuit at the implanted power switch on the board, check DC voltage at the power switch and trace the PCB, you should find a component "O.L.", you may check a few resistors, diodes and a Voltage Regulator in the loop.
I just installed a 2 ton Fijitsu mini-split last weekend, and was literally praying I would not have to trouble shoot it till I got done watch'n this video!
Hey Chris, mini splits are only as hard as you make them!!!! Always remember if you get stuck on one you can always call the manufacturer, as a matter of fact they want you to call them. Thanks for watching
T&N Services LLC. I'm calling you !! LOL.
This is super helpful thanks. I broke the CN3 (RT64 thermistor) wire on the power board with the capacitors on it. What's the best way to change that board out? Do I have to remove this front board first? Thank you.
Great video Ralph on explaining the circuitry of the unit
Thanks Harry
Nice video/ thanks for all your current help with the big M
I think the problem on the board is ZD 652, there is a cold soldering you can see that the print is dark around the soldering , maybe changing zener diode and / or soldering it again
Regards
Niels
Betcha that extra silicone blob on the new board is to keep the part from vibrating and breaking a leg due to fatigue.
Those systems are becoming a little less intimidating, thanks to your videos. Thanks for roughing it one-handed to get the video.
I really wanted to get a video on the first control board I installed but by the time I got there to do the job it was dark and I had to install it by using a flash light. I was bummed out because I didn't get to film it. So this video does prove they do break and you might come across one. Thanks for watching, I'm glad I could help
nice job on Mitsubishi here in North Canada
we get lots of power issues surges outages and I do lots of boards still customers don't want surge protectors go figure what about there?
Just add them in your price. Customer don’t know what they want sometimes
Nicely done and taught Ralph !! Take care, Brett
Thanks Brett
Nice video Ralph, things are so much easier when you have seen them done. Keep up the good work.
Ray
Hey Ray I'm one of those guys that learn from watching, that's why I like RUclips!!!! I've learned a lot from the other guys as well. Also reading peoples comments help too
Doing one tomorrow.
Great video Ralph. You have some good tips there.
I just had an hvac contractor quote me $645. labor to replace the circuit board on a Mitsubishi mini-split outdoor unit!
Those noises just after power-on were self-test. Sounded like it was poking the motors with short pulses.
great video Ralph on these mini split thanks for posting
Hi guys, the noises on power up are the exv( electronic expansion valves ) opening.E6 fault? He'll there are so many things that can fail, the c&n 801 pink plug should have 325- - dc .Then the fuse f64 behind the front if blow would mean the power board has failed. Near this fuse are white resistors 10 ohms 5w . Make sure you check them and again the left power board would fail these.On the power board with three blue caps- red probe to n and black to p(yes) power off there should be hi resistance in k ohms and between u v w, not low ohms.Check those exv ,s are not corroded on valve stems- it will blow out resistors where they plug in.If a exv fails and no spares 2 curved magnets will open it turned like a tap. C/w shut and cc/w openHope I've helped somebody .Roy in nz
So why exactly would the corrosion on the exp valve cause it to blow the resistors.
Are these resistors controlling the exp valves or is the valve remaining shut and causing high pressure on the compressor and therefore overloading the drive circuitry that the resistors are part of?
Very curious thanks.
John Thimakis
Philippe Martin
Yes sir. You mentioned me.
What is it ? 🤔
I have two 2 ton mr slims with bad boards. thank you so much
Actually I saw several spots that seems burned. You did it so fast but it looked like a little capacitor was burned.
2 boards in one month? Wow, how much do these boards cost and what is the average labor cost to perform the repair if not covered by the warranty? Is this a common problem and if not what do you think is causing this frequent failure of the control board thank you in advance!
What causes the boards to fail? Can the consumer to anything to prevent failure?
Ha man like the vid.. I do see these mini spits down in Florida. I wrk on them sometimes but I like the technical part. So now I no if I run in this problem I will have your video saved. Thks for the advice and the lesson.
Hey Eddie it's not often you should have to work on them but when you do it's nice to get to see a video on them
why does the AC control board damaged so easily, is it due to surge?
Can you help me, my 18 k is ok but the two 9k are not communicating with the out door unit I can turn them on with the remote the luvers open and the fan comes on. What is the most likely cause on the pproblem?
cheers Walter
Are multi zoned mini split are a good alternative to a regular central unit?
I accidentally wired the active cable for my main power in to a signal terminal where the sdi cable goes. Is there a high chance I would've blown the board? My ac split system runs but it doesn't cool..it's pretty much a fan lol
Man Ralph you are the King of mini splits! Great video! You need a laptop or ipad to troubleshoot those inverter systems don't you?
Thanks Wayne, as far as needing a laptop it's not necessary, I've got a 1-800 number LOL
Nice video Ralph and most definitely learned a lot
Thanks Nicholas
Nice work I learned a lot. Thanks Ralph
Thanks Zack
T&N Services LLC. Ralph do you know if Mitsubishi makes a unit that can handle the cold up my way? I know we're installing a mini-split heat pump in a enclosed porch but I think it's a Fuji.
Hey Rob, They do make one, I would go talk to the supplier or give the applications department at Mitsubishi a call to see which one the suggest
hi what state are you in? looking for good service in Baytown, tx.
do you know a good supplier for boards for Quietside? Thanks, robert
Good video Ralph , thanks for the info and explain.
No problem Justin
Nice video. I am actually going to the mitsubishi m & p class near atlanta in septemeber.
you will die when you see how big the building is. I've got a video on the building, I was driving by it one day. I might check on going to the M&P class myself as a refresher as a diamond contractor they give us one class a year for free.
thanks for the info Ralph it's really helpful
Is it hard to change an expansion valve?
Hey Ralph, where can I buy this circuit board? Thanks in advance
Thanks for the lesson
No problem hvacman
Can you help me, I have a Friedrich model # MR36TQY3F ser# ABFT 02178 for 5yrs. working ok but now the 18
Good video!
Thanks Clemons
Thanks Clemsons
Anybody seen video on the board on top of the unit?
Hi t&n , check those expansion valve and stems for corrosion. Swap unused for the two circuits in use. Just a thought after you replacing the board more than once.(:
what did you mean by swap unused for the 2 circuits in use? Where is the expansion valve and stem in the outdoor unit?
Hi, I mean if you thought electronic expansion valves were,t opening on power up and may be or giving problems you could use spare un used from indoor circuit d. Swap the head and plug. They are at the bottom back.
😂😂 I found out the hard way one day when my hands was damp why you don't play with that pink molex plug cuz I took that DC voltage to my hand ouch
Thanks for the info. 👍
I so do not like circuit boards. They're always way too expensive. The companies go out of business or the company changes to a different board or stops making that board or every electric issue causes a problem and you can't get anywhere with the utility company or you have to call a 1-800 number for technical assistance and after an hour of fustration talking to some guy in india decifering his english you get nowhere. Why do you need them. I've come across older AC systems on restaurants that have obsolete circuit boards, I removed them and installed a compressor contactor, a blower contactor a time delay a 24v transformer and a new thermostat...easy...strong and works long term like a refrigeration system and I didn't have to take a $1500.00 course to work on the units circuit boards. Sorry for the rant, I drank too much coffee, I have to go fix a bakery freezer. (no circuit board) My glycemic level goes up just smelling the confectionary sugar there, it's a sweet job.
because if you want high efficiency it's needed.
My liters on the circuit board are flashing 3 flashes
nice job!!!!
If I was King for a day I'd outlaw circuit boards, and louvers on AC condensers, and gold toothed sun tanned golf sweater wearing maintence contract salesmen who take your customers on Jan 1 when you need them the most, after taking care of them all summer.
Jim your in a roll today!!!! I don't know who ruffled your feathers but I like your comments this fine Friday morning
More than likely a sensor issue not the board if the sensor resistance isn't correct there will be a lock out relay activated on the board
Dean Perry can the lock out be reset? Cheers
@@reneparon7105 yes by replacing the sensor or sensors with the correct resistance reading for that model problem solved
But the new board got it running not a sensor.
Customer is lucky it's the control board and not the power board. That big ass power board is expensive as F@#k.
this shit would be allot simpler if we listened to TESLA.... LOL Chasing electricity seems to be our biggest job, or mopping water up...