Mini split units are nice to have and usually very reliable heating and cooling units.
Unfortunately, errors can happen, which is usually displayed on the indoor wall unit.
This error can be looked up in a manual to see what the meaning is.
For example, an E1 error code on a Pioneer Mini Split means there is a problem with the Indoor/Outdoor unit’s communication.
Often error codes can be manufacturer-specific, and sometimes, different models can have different errors codes.
The best way to troubleshoot any code is to have the manual for your unit.
Sometimes finding a manual can be difficult, so here we list the known error codes for big-name mini split manufacturers.
Keep in mind that there may be differences between models, but most of the codes should match.
Pioneer Mini Split Error Codes and Meanings
Display | Status |
---|---|
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) |
Read Here for full Pioneer Mini Split Error Codes List with Causes and Fixes
Carrier Mini Split Error Codes and Meanings
Display | Status |
---|---|
08 | Defrost Mode 1 |
0A | Defrost Mode 2 |
F3 | Outdoor ambient temperature sensor malfunction |
F4 | Outdoor mid ---coil temperature sensor malfunction |
F5 | Outdoor discharge air temperature sensor |
F7 | Cooling oil return cycle |
E1 | System high pressure protection |
E2 | Indoor freeze protection |
E3 | System low pressure protection |
E4 | Compressor discharge high temperature protection |
E6 | Communication error between indoor and outdoor |
E7 | Mode conflict |
E8 | System overload protection |
E9 | Cold Blow Protection |
dd | Test mode |
Fo | Pump down mode |
P0 | PM Rest |
P5 | Compressor current protection |
P6 | Communication error between the inverter drive and main board |
P7 | Heat sink temperature sensor malfunction |
P8 | IPM over temperature protection |
P9 | Open Contactor |
Pc | Current sensor malfunction |
Pd | Current sensor mis ---wiring protection |
PA | Input current protection |
PF | Inverter board ambient temperature sensor malfunction |
PL | Low voltage protection |
PH | High voltage protection |
PP | Abnormal input AC voltage |
PU | Capacitor charging malfunction |
H1 | Defrost or heating oil return cycle |
H3 | Compressor overheat protection |
H5 | IPM Protection |
H7 | Compressor speed reduction |
Hc | PFC board protection |
L9 | Compressor high voltage protection |
Lc | Compressor start ---up failure |
Ld | Compressor phase loss protection |
LE | Compressor stalling |
LF | Compressor over ---speed protection |
A5 | Condenser coil inlet temp sensor malfunction |
A7 | Condenser outlet temperature sensor malfunction |
EE | Memory card error |
En | Frequency limitation for module circuit protection |
EU | Frequency limitation for module temperature protection |
F6 | Frequency limitation for overload protection |
F8 | Frequency limitation for system circuit protection |
F9 | Frequency limitation for module circuit protection |
FH | Frequency limitation for freeze protection |
HE | Compressor demagnetizing protection |
LP | Indoor and outdoor units mismatch |
U1 | Compressor phase detection malfunction |
U3 | Low DC bus voltage |
dn | Communication error between main board and EXV |
Read Here for Full Carrier Mini Split Error Codes List
Cooper and Hunter Mini Split Error Codes and Meanings
Error Code | Power LED | Status |
---|---|---|
E1 | OFF 3s and blink once | High pressure protection of system |
E2 | OFF 3S and blink twice | Antifreezing protection |
F0 | In defect of refrigerant |
|
E4 | OFF 3S and blink 4 times | High discharge temperature protection of compressor |
E5 | OFF 3S and blink 5 times | 5 Overcurrent protection |
E6 | OFF 3S and blink 6 times | Communication Malfunction |
E8 | OFF 3S and blink 8 times | High temperature resistant protection |
EE | EEPROM malfunction |
|
EU | Limit/ decrease frequency due to high temperature of module |
|
C5 | OFF 3S and blink 15 times | Malfunction protection of jumper cap |
Fo | OFF 3S and blink 1 times | 1 Gathering refrigerant |
F1 | Indoor ambient temperature sensor is open/short circuited |
|
F1 | Indoor ambient temperature sensor is open/short circuited |
|
F2 | Indoor evaporator temperature sensor is open/short circuited |
|
F3 | Outdoor ambient temperature sensor is open/short circuited |
|
F4 | Outdoor condenser temperature sensor is open/short circuited |
|
F5 | Outdoor discharge temperature sensor is open/short circuited |
|
F6 | Limit/ decrease frequency due to overload |
|
F8 | Decrease frequency due to overcurrent |
|
F9 | Decrease frequency due to high air discharge |
|
F9 | Decrease frequency due to high air discharge |
|
FH | Limit/ decrease frequency due to antifreezing |
|
PH | Voltage for DC bus-bar is too high |
|
PL | Voltage of DC bus-bar is too low |
|
P0 | Compressor Min frequence in test state |
|
P1 | Over Voltage or Low Voltage Protection | |
P2 | Compressor maximum frequence in test state |
|
P3 | Compressor intermediate frequence in test state |
|
P5 | Overcurrent protection of phase current for compressor |
|
PU | Charging malfunction of capacitor |
|
P7 | Malfunction of module temperature sensor circuit |
|
P8 | Module high temperature protection |
|
P8 | Module high temperature protection |
|
H0 | Decrease frequency due to high temperature resistant during heating operation |
|
H2 | Static dedusting protection |
|
H3 | Overload protection for compressor |
|
H4 | System is abnormal |
|
H5 | IPM protection |
|
H5 | Module temperature is too high |
|
H6 | Internal motor (fan motor) do not operate |
|
H7 | Desynchronizing of compressor |
|
HC | PFC protection |
|
L3 | Outdoor DC fan motor malfunction |
|
L9 | power protection |
|
LC | Failure startup | |
U1 | Malfunction of phase current detection circuit for compressor |
|
U5 | Malfunction of complete units current detection |
|
U7 | The four-way valve is abnormal |
|
U9 | OFF 3S and blink 18 times | Zerocrossing malfunction of outdoor unit |
H1 | Defrosting |
Daikin Mini Split Error Codes and Meanings
Error Code | Status |
---|---|
00 | NORMAL |
U0 | REFRIGERANT SHORTAGE |
U2 | OVER-VOLTAGE DETECTION |
U4 | SIGNAL TRANSMISSION ERROR (BETWEEN INDOOR AND OUTDOOR UNIT) |
A1 | INDOOR UNIT PCB ABNORMALITY |
A5 | FREEZE-UP PROTECTION OR HEATING PEAK-CUT CONTROL |
A6 | FAN MOTOR (DC MOTOR) ABNORMALITY |
C4 | INDOOR HEAT EXCHANGER THERMISTOR ABNORMALITY |
C7 | FRONT PANEL OPEN /CLOSE FAULT |
C9 | ROOM TEMPERATURE THERMISTOR ABNORMALITY |
EA | FOUR WAY VALVE ABNORMALITY |
E1 | OUTDOOR UNIT PCB ABNORMALITY |
E5 | OL ACTIVATION (COMPRESSOR OVERLOAD) |
E6 | COMPRESSOR LOCK |
E7 | DC FAN LOCK |
F3 | DISCHARGE PIPE TEMPERATURE CONTROL |
H0 | COMPRESSOR SYSTEM SENSOR ABNORMALITY |
H6 | POSITION SENSOR ABNORMALITY |
H8 | DC VOLTAGE / CURRENT SENSOR ABNORMALITY |
H9 | OUTDOOR TEMPERATURE THERMISTOR ABNORMALITY |
J3 | DISCHARGE PIPE THERMISTOR ABNORMALITY |
J6 | OUTDOOR HEAT EXCHANGER THERMISTOR ABNORMALITY |
L4 | RADIATION FIN TEMPERATURE RISE |
L5 | OUTPUT OVERCURRENT DETECTION |
P4 | RADIATION FIN THERMISTOR ABNORMALITY |
Read Here for Full Daikin Mini Split Error Codes List
My Boreal split system is showing an error code of ; HC. What does this mean?
My senville wall unit keeps shutting off and pc than 3 pops up what does that mean
I am getting an Fy Code but I cant Find this code in any of the manuals.
Does anyone know what this is:?
we have a Rovsun 12000 BTU, 230v–shows “FY” code, cools only (NO HEAT), seller provides NO manual, seems “FY” is also an anomaly here as well.
my pipe is freezing up but no cold air, have a error 43 and 44 on controller board using a mr. cool split ac unit. I’ve been using unit for over a year never a problem
I’m getting a E9 on my Gibson mini split. Anyone know what E9 is? My manual is missing.
My Pioneer Inverter mini split will not run two heads at the same time….the digital display shows 2 hyphens (- -)
Both units must be in same mode….both cool, both heat, not one on cool and other on heat .
The temp LED’s are showing – -, two dashes and the unit shuts off????
Did you ever find out what caused this – – ? I have the same issue.
Have Air Com unit is on heat and unit is showing err code L3 ?
IPC mini split heat pump model … DLF4HH12K1A1 error code F3 . Could you tell me what it means.
Thanks
Gary
My Pioneer Mini Split 9000 BTU is beeping every ten seconds or so and showing 88 and the WiFi signal. Not sure what code that is as it is not on the list. Any help or info would be appreciated
My air temp shuts down 6-8 times in 24 hr period, power light comes on temperature stays light up but 3 mins later it comes back on as normal. It only started since I turned on the heat and only use to be once a day but now it’s 6-8 times a day or every 3-4 hrs.
you might want to check the batteries on your remote. Highest temp read is 88 degrees. Seems your remote is stuck on 88 for that reason? just guessing…
I have a Carrier unit giving me an L3 code – don’t see it listed above. Any ideas what might be going wrong? It’s not heating…
I have a d2 code and I can’t find the error answer
I have a d2 code too on my pioneer split unit and cannot find out what it means. I spoke with a technician who told me he doesn’t know either. Did you happen to find out what it means?
I also have this same d2 code on mine. Did you ever figure out what it means?
How to fix h3 Compressor overheat protection?
My two indor units show an F1 error, it is brand new out of the box and had an ac guy put the vacuum pu,p and all the connections, we tested all the power and grounds, we looked at the mother board and could not find any loose connections.
Code h7. What is it and how do I fix it