What Is A P1 Or P4 Error Code? - MRCOOL DIY Ductless Mini Split

I recently bought a 3rd gen mr cool mini split. I had professional plumber and electrician install. Once the unit was powered on I got a P4 error. I followed the troubleshooting guide and had them both check the plumbing and the voltage. Where do I go from here to get some help. I have yet to see it work as anything more then a fan.

New 24k BTU 20 SEER MrCool DIY Ductless Heat Pump Split System 3rd Generation installed and it keeps running for a short time then giving an Error of P4. Would low Freon cause this error code?

I have a 240V DIY 24k Mr Cool unit that has run for 2 years without an issue. I had to clean the drain line (indoor water leak) and correct a mounting issue with the indoor unit and then it would not turn on. No error codes or anything. After chatting with Mr Cool and doing some troubleshooting, I first replaced the indoor control board, and then the outdoor control board after that didn't work. I have also tried a new cable despite good continuity checks between the indoor and outdoor units to no avail. Supply voltage is present on both units. On the indoor board (new and old), The low voltage 5VDC doesn't show up at all with a meter which is why I assume the LED board isn't lighting up. Nothing seems visibly cooked on either of the boards boards. The new indoor board was replaced before I also replaced the outdoor board. Using the micro switch on the board did nothing as well. With the outdoor board, I'm getting a steady green light and a slow, then fast blinking yellow/orange light which I have only deduced likely means error. I hear a click from a relay or valve kick in when the outdoor unit is turned on but that is it. It then clicks again after power off and the caps drain out. I'm at a loss with it. I was sent to you guys for the replacement boards that I got by Mr Cool and Mr Cool has tried to help on the phone to no avail. I saw this Q and A and figured I would ask in case one of you guys have seen this or have any ideas on what could be going on. Would

I installed m second 12000 btu DIY unit. This unit powers through in cool mode(turbo works) but heat gives a p4 error(turbo doesn’t power on). I checked no leakage and wired right.

We purchased the 12000 BTU 19.5 SEER in July 2020, the outdoor unit is coming on running approximately 30 seconds and giving a P4 error. The unit has been turned off as instructed in the video, L1 and L2 has 118 volts on both.

Your site says that the P6 error code is for the 36K Units only but I have a 27K unit throwing that code. Any ideas?

I get no heat from my mr cool split unit i get a error code p4 what should i do, the voltage to the unit is fine

How do I troubleshoot a F3 error code on a MRCool DIY 3 zone with 2 air handlers installed? Only one of the air handlers displays the error, but neither zone works.

I have a 36k multi unit mr cool system. Im getting a p6 on all three air handlers and i took cover off of condenser outside and that is showing a p1 code. Also when i turn the mode to heat on all three air handlers nothing happens no air flow at all? What could yhe problem be?

I have a diy-hp-24 Mr cool and the control board on the indoor has no display.The unit will not respond to the remote if I try to power on.I tried replacing batteries and tried a new remote.If I push the force button on the unit the board displays temp and the fan comes on. But the remote will not turn unit on and display blank unless I force cool button

I just hooked up my 36K 4 zone DIY and when I turned the unit on the first time I got P6 errors on each indoor unit and the outdoor LED board displayed P2. Not sure what the problem is here?

I have a DIY 9 and it is giving me a 88 code? what do i look for?

My unit reads PO I have turned breaker off for several minutes trying to reset it doesn't change anything.

My 36k Mr. Cool DIY unit showed an FC code when first powered up after replacing indoor control board. It went away and unit began to run normally at start up. Then after 15 minutes indoor unit shuts fan down to low speed, disables remote functions except on and off functions. This will go on for 10 minutes or so and then fan begins to ramp back up and remote functions are enabled again. Outdoor unit will sometimes run during these events and sometimes it completely shuts down. This unit is behaving the same way it did before replacing the indoor control board except the turbo function now works with the heat mode with new board installed. What’s going on with this?

My contractor recently installed a Mrcool split unit in my new addition. It worked well for 2 months and now is displaying a PC 04 message. Along with that the outside unit shakes before the error code comes up. I’m not getting proper heat and it’s getting colder. What would your suggestion be to resolve this situation.

What does a "dF" code mean?

Have mini split... what does df mean

I have a Pioneer inverter Model# WS012GMF122HLD INDOOR S/N 24032423707732308D0053 OUTDOOR S/N 2403243120574180160003. This unit has a P4 code. I have turned off the units power and rebooted the unit and checked the voltage, the code is still showing P4. We have called and left a message with Mr. cool @ 270-366-0457 and also called the other number 270-575-9595 and left messages on both numbers. What else could it be?

We just installed a MrCool mini split and are testing three handlers. Each is running well, so far, but each also occasionally and recurring flash PC 03. I can't find any error codes just like that. Closest I find is on this site is a P3 code related to outside ambient temperature, but it is 71 outside so that shouldn't be the problem. Pretty weird to get error codes no one has listed. Any ideas?

The women talking is the crunchy mom from youtude!

Hello, I recently installed 2 36k multi zone mr cool systems. I meticulously followed all the directions while installing, including checking for leaks, ensuring I was careful when bending pre-charged lines, and opening the refrigerant lines at the compressor. When I started up the system, all air handling units worked well for about 1.5-2hrs, but then it threw “PC 02” code. I referenced the manual, and called Mr. Cool tech support, as well as your tech support(left voicemails on both, and waiting for a call back). I checked for leaks and verified there were no leaks. I shut down the system for 10 minutes, then restarting and it seemed to have went into the similar cycle; it ran well for about and hour, although now it threw “PC 03”. The “PC 03” code would flash a few times, then it would go back to set temperature and seem to have ran, but then in a few would flash “PC 03” again. I turned off the system yet again for 10 minutes, and it ran ok for 30 min-1hr, then it threw code “PC 03”. I understand these codes could mean: PC 02 Connection wires Outdoor PCB IPM module board High pressure protector System blockages PC 03 Connection wires Outdoor PCB Low pressure protector Refrigerant I have looked into most of the confections, at air handling units and both compressors, and they seem to be fine. I will verify the connections on the PCB board today, and give that feedback when I hopefully speak to tech support. I figured I would get on this to get some direction. Do you have any recommendations? It’s just a bit strange 2 systems/compressors would be showing the exact trouble codes. Your help is greatly appreciated!

I have a Mr. Cool 240 volt unit, giving me a P1 code I checked the voltage at l1 and l2 with 246 volts. Unit has been in for over a year with no issues.

What if it was not installed by a certified HVAC installer just by some random guy posing as a installer what do I do

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I encounter a P4 error on my carrier window type inverter ac. Is there a DIY means to fix it?

i had a p1 error code. turns out the 12k advantage unit is 220v, unlike the DIY 12k unit which is 110v. All of my ductless mini splits are working perfect now :)

What is a P7 error code. Our wifi mini split worked great and then kept showing offline, which meant no control of it through the app. I installed a new wifi kit and it worked for two months. Now I am back to Offline. Shortly after I get it to the AP mode, it displays P7 and the network is not displaying in my app. Any suggestions?

I have a P2 code on the heating cycle and the unit stopped. What needs to be done to correct this issue? I purchased the premier unit.

I have a new Mr Cool we had a blinking 88 and a data sign we replaced the inside blower motor it is doing the same thing again. What can the issue be

Installed a triple head Mr.Cool 6 months ago. P6 coming up all of a sudden on one unit only?

Hi i am getting p4 error on my midea fp-51ara010heiv-n4 is this something i can fix on my own or should i need a repair?

I installed the double head Mr cool unit four months ago. It has been working good in ac mood. Now it is getting cool and when the unit goes to heat mode a P0 code will start to flash as the unit satisfied and is winding down. It will start over with out doing nothing and will blow warm air until it satisfied and starts wind down and flashes the P0 agin.

Good evening I installed my mr cool diy 24000 unit worked great for a week now getting a p4 error code

I have the diy Mrcool 36,000 heat pump now after about 4 months of using it when I change the temp up or down I get a code ( OF not fo ) don,t see any thing about this,the temp does change but why the code.

New unit 18000 btu 220 no heat p4 code

I keep getting a p4 error code on my Michu-18avh2. An inverter compressor code. Everything is working fine but the compressor won’t turn on. How can I fix this problem?

My unit was installed by a certified HVAC TECH. I know nothing about how to test the electrical nor do I own a electrical testing meter. The only thing I can do is call the installer to come out and do your recommended testing. So who is going to pay the installer?

I get no error code but the suction line ices up at times, the indoor fan speed seems low even tho it is set to high. Filters are clean and the outdoor unit never shuts off. Why is the pipe icing?

Orient inverter p0 p4 p2 what is this

I installed a 30k dual zone Mr.Cool mini split and it seems to be working at first when I call for cooling. The outdoor fan comes on the Indoor fan seems to be blowing decent. But after about 5-10 minutes it will flash a p6 code for a few then go away and a couple times the outdoor unit turns off and will eventually kick back on. I opened the king valves connected all the lines property before turning the system on. Any reason for this code?

Have mod# A-18-HP-C-230B with 1 unit indoors . Have E3 code come up ,Indoor fan over speed , Shut down power ,pulled Batterys out of remote ,problem still there . Please advise . Thank you ,Frank

Recently installed mr cool mini-split. Customer called to report F5 code is showing. I will be going to check the unit. Since I do not have the manual in hand, what should I look for?

MrCool 36K, been running perfect and nearly non-stop since April. For the past month I've been getting an F0 error and no heat once the temp dips below 50F. Outside unit sounds like everything is going to work until the the moment the pump kicks on, then it immediately shuts back down. The fan remains running for 30-45 seconds. In AC mode, low side pressure reads 118-119 PSI. The unit keeps cycling through this process, I'm guessing every 5 minutes. Given these variables, what could throw the F0 error?

I have Klimaire mini split model KSIV012-H119-O it was installed 2-19-2020 and in the heat mode it just threw a P1 code. What do I do

Thank you Kyle for the message, installer came out checked unit and determined the actual code was P3 due to -35° wind chill in our area overnight. Built a wind break for future problems. Working Great now really appreciate your imput.

We installed a 12,000 btu mr cool system and when we turned it on we received a P1 error code. We turned off the system and turned it back on and while opening the head unit door that rotates upward the led turned off. We have been unable to get it to power on after that. Any ideas what may be wrong? (we already checked the led box and led control cable with another unit.

Looks like Mr Cool and Senville have the same error coding? Just installed a Senville 18000 BTU Dual Zone. Outdoor unit shows error code E5 and indoor units P1. According to Senville code list. E5 is Voltage problem and P1 is abnormal voltage. I guess it’s the same issue being registered indoor and outdoor?