What is an E1 Error Code? - MRCOOL DIY Ductless Mini Split • Ingrams Water & Air

What is an E1 Error Code? - MRCOOL DIY Ductless Mini Split

If an E1 error code shows up in your air handler, that means there is a communication error either with the indoor unit or the outdoor unit. The causes for this could be a wiring mistake, or a faulty control board with the indoor unit or the outdoor unit.

Troubleshooting An E1 Error Code

One thing you can do to try and troubleshoot the E1 error code is power off the MRCOOL DIY mini split then wait two minutes and restart it. If the E1 error code displays again, however, you may want to measure the unit's voltage. If you are not comfortable working with electricity, you may want to call MrCool tech support at 270-366-0457. For the outdoor unit, take off the side wiring cover with a screw driver. Then, using a multi-meter, test the voltage. For a unit running off of 120 volts, touch the ends to L1 and Ground. For a unit running off of 240 volts, you will want to touch the ends to L1 and L2. For the indoor unit, you will want to place the ends of the multi-meter on 1 and 2 to make sure the unit is getting voltage. For a 120 volt unit, you will want to go between 1 and Ground. Doing these things will help you determine if the unit is wired correctly. If it is not a wiring issue, it is possible your control board may need to be replaced in either the indoor unit or the outdoor unit. This is when it is important to call the MRCOOL Warranty Department so they can help you determine the reason for the E1 error code.

Other MrCool DIY Error Codes

E0 - Indoor unit EEPROM parameter error
E1 - Indoor / outdoor units communication error
E2 - Zero-crossing signal detection error
E3 - Indoor fan speed has been out of control
E4 - Indoor room temperature sensor T1 open circuit or short circuit
E5 - Evaporator coil temperature sensor T2 open circuit or short circuit EC - Refrigerant leakage detection
F0 - Overload current protection
F1 - Outdoor ambient temperature sensor T4 open circuit or short circuit
F2 - Condenser coil temperature sensor T3 open circuit or short circuit
F3 - Compressor discharge temperature sensor TP open circuit or short circuit
F4 - Outdoor unit EEPROM parameter error
F5 - Outdoor fan speed has been out of control
P0 - IPM malfunction or IGBT over-strong current protection
P1 - Over voltage or over low voltage protection
P2 - High temperature protection of IPM module or compressor top
P3 - Outdoor ambient temperature too low
P4 - Inverter compressor drive error
P5 - Indoor units mode conflict (multi-zone ONLY)
P6 - Low pressure protection(Only for 36K)

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David Bonzell

I have a DA2421-H21 24,000 btu Ductless Air unit. Once a week I notice error code P4 at the Display window and a hissing of R410A inside the evap unit coils. This continues for 15 seconds, and the code and hissing clears. Can you reply on the cause?

Steven

We don't sell the DuctlessAire line of mini-splits, so we wouldn't know for sure what the issue may be. However, if it were the MrCool DIY line of mini-splits, this video may help: https://iwae.com/resources/videos/p1-p4-error-code-mrcool-diy-ductless-mini-split.html

Bev

On really cold mornings the display is E1 .And I haven't even touched anything.Stays like that till the sun comes up .It comes on when it gets warmer.Meanwhile I freeze.Had a person come round saud he couldn't find anything wrong with it.Still charged $137.00 Unit is 13yrs old and a Gujjar.Should I replace it.Goes fine normally.

Steven

We've never heard of a Gujjar air conditioning system. If you paid an HVAC technician to diagnose the problem and they couldn't find anything wrong, but there is evidently something wrong, then I would suggest you get a second opinion from a different HVAC technician. The entire system may need replacing, or it may be a fairly simple fix to continue with the current system.

ken

How do I determine witch control board it is for e1 code

Dan Danowski

This requires a voltmeter set to the DC scale. The probes are used on terminals 2 and 3 at the outdoor unit with the system turned on. If the DC voltage is a fixed value, the indoor board is the problem. If the DC voltage is a varying valve and does not change polarity, then the outdoor board is the problem.

Adam

I installed ducted eco air ac unit and got a E-1 error code. I checked my wire between outdoor and indoor unit and I have continuity and also I got proper voltage. I changed thermostat and checked all connections and fuses. Indoor fan works fine but no cooling. Please help

Dan Danowski

I'm sorry, but we don't carry Eco Aire and we're not that familiar with it. The owner's manual should have a troubleshooting section that might help.

David

Have a dual ductless MRCOOL. Less than a year old. Tested voltage where specified. Reset CB for 5mins. Both units will work after resetting but will go back to E1 after a while, sometimes half a day or just a few minutes.MULTI2-18HP230V1, Outside unit. O-MULTI12HP-WMAH-230 inside unit.

Paul Yuccas

Interested in a response to David’s comment earlier. I am having the same issue.

Mike Main

Purchased 3 Mr Cool systems outdoor M# DIY-Multi3-27HP230, 2 installed, one installed mid September second installed mid October, 2021 for both units, on Sunday one unit had error code P1 reset by turning off then on power, worked fine, today I’m showing E1, full power to both indoor and outdoor units. Did everything in the trouble shooting guide, pushed the black button for digital light, but it never came on.

Dan Danowski

Give us a call at 270-575-9595 and speak with tech support.

Jordyn Dietzler

I have a minisplit with 2 indoor units, I Installed June 6th 2021. I had both heat and ac wotking just fine. But now that it's winter I hadn't had it on in a few months. I woke up one morning and both indoor units had an E1 code. I reset the breaker a few times and waited 10 minutes. And E1 keeps showing up.

Rebekah Muller

That error code is indicative of a communication error between the indoor and outdoor units. Please give us a call at 270-575-9595 so that our tech support team can assist you.

Jason Ross

I just installed the DIY 27k multi unit with 9k & 12k indoor units. I had just finished running the initial test and I got a P6 error code on both indoor units I can't find any information on how to correct it on a 27k unit what does a P6 error code mean

Rebekah Muller

Please give us a call at 270-575-9595, or contact the manufacturer.

Tony

We have 36k Mr Cool condenser with 4 air handlers. We got a P4 error on all 4 air handlers. Ingraham tech said it must be the warrantied control board. We switched out the control boards. Now we get E1 error message. Turned off units for 2 minutes, turned them back on same error code E1. Checked L1L2 240 volts AC and needle was steady on 240. Checked A,B,and C and all were steady on 240 Volts AC. Error code E1. No cool air. new control board.

Rebekah Muller

Please give us a call at 270-575-9595 as soon as you possibly can.

Tony

What is the small button you can press on the control board?

Rebekah Muller

This button reconfigures the line sets and electrical automatically in case there was an installation issue.

jeff gray

I have a 3 year old advantage series mr cool 24K BTU mini split I’ve used for a couple years at my shop, after a recent storm, I came in and found it, not running, and the breaker was tripped, and when I reset the breaker it now comes up with an E1 code . I checked the voltage on the outdoor unit on wires two and three and it’s showing a negative value only, Ac power was around 24v on power wires

Rebekah Quarles

Please give us a call at 270-575-9595 so we can assist you with this issue.

Mike Titus

I have a 3rd generation 36,000 BTU Mr. Cool. I started using the Cielo Breeze Lite to control my mini splits in Florida and wanted to use this app to control my Mr. Cool in Maine. I set up my Cielo app to control the Mr Cool with my Cielo Breeze Lite in Maine and the signals work fine, unfortunely the Mr Cool remote and the MR. Cool Smart Controller are still sending commands. How do I stop the commands from the Mr. Cool Smart Controller? My family has lost the Mr. Cool Smart Controller, but the signals keep coming. Any help will be greatly appreciated, Mike Titus

Rebekah Quarles

The MrCool Smart Controller is a USB adapter in the front of the unit that connects to the Smart HVAC App. The USB adapter is in the front panel on the inside of the air handler and can be removed at any time.

Abel

I have mini split Mr.Cool and I get E1 code on the display, so I checked voltage on L1, to ground 120 volts, L2 to ground 120, also at the number 1 for the indoor unit 120v, number 2 en ground the same 120 volts. But the number 3 to the ground is reading 70 volts. So I reset the unit and it’s working for around 2 to 3 minutes and after this I got the E1 again Also my out door Coil fan is not working Please help.

Rebekah Quarles

Please give us a call at 270-575-9595 as soon as you possibly can.

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