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Error codes

Search error codes & find solutions!

Mini Split Code Guide

E0/EH00 - Error code - the indoor unit has an EEPROM (electrically erasable programmable read-only memory) parameter error.

E1/EL01 - Error code - there is a communication error between the indoor and outdoor unit.  In new installs, they should shut down the unit immediately to prevent damage and check their wiring and electrical voltages.  Can also be caused by interference from high frequency electronics near where the line set runs (flatscreens, computers, microwaves, etc).  Existing installs, it is commonly a board issue.  Perform AC electrical test and confirm and then do DC test.

E2/EH02 - Error code - there is a zero-crossing signal detection error.

E3/E88/EH03 - Error code - indoor fan speed has been out of control.

E4/EH60 - Error code - indoor room temperature sensor T1 is in open circuit or has short circuited.  The T1 sensor connected to the indoor board is loose or has gone out.

E5/EH61 - Error code - evaporator coil temperature sensor T2 is in open circuit or has short circuited.  The T2 sensor connected to the indoor board is loose or has gone out.

EC/EL0C - Error code - refrigerant leakage detection.  You will need to find the source of the leak, either through a very thorough soapy water test across the system or by having an HVAC tech come out and perform a leak detection test.

EH0b - Error code - indoor PCB/Display board communication error

F0 - Error code - loose wire on outdoor unit, incorrect voltage, or outdoor board

F1/EC53 - Error code - outdoor ambient temperature sensor T4 is in open circuit or has short circuited.  The T4 sensor connected to the outdoor board is loose or has gone out.

F2/EC52 - Error code - condenser coil temperature sensor T3 is in open circuit or has short circuited.  The T3 sensor connected to the outdoor board is loose or has gone out.

F3/EC54 - Error code - compressor discharge temperature sensor T5/TP is in open circuit or has short circuited.  The T5/TP sensor connected to the outdoor board is loose or has gone out.

F4/EC51 - Error code - outdoor unit EEPROM (electrically erasable programmable read-only memory) parameter error.

F5/EC07 - Error code - outdoor fan speed has been out of control.

F6/EC56 - Error code - Evaporator coil outlet temperature sensor T2B is in open circuit or has short circuited.  This is a multi zone error code.  It means that the T2B cable has come loose during shipping or due to vibration.  Shut down the unit and turn it off at the breaker.  Remove the top and side panels of the unit and then search around inside for a large white Molex plug.  The location can vary, but this is usually located below the circuit board and terminal block.  Ensure that the plug is securely seated and then replace the panels before restarting the unit.

P0/PC00 - Error code - IPM malfunction or IGBT over strong current protection.  Check AC electrical readings on the unit and confirm.

P1/PC01 - Error code - over voltage or over low voltage protection.  Check AC electrical readings on the unit and confirm.

P2/PC02 - Error code - high temperature protection of IPM module or high pressure protection.  This error is generally restriction related.  You should double check all of your line set connections at air handlers, condenser, and any extension couplers to make sure they are tightened down fully with no threads showing and that your service valves are opened all the way to the locking ring and slightly snugged.  If the unit is a multi-zone unit (not including dual zone gen 4 units), then you should also confirm that the king valves are opened on the two vertically running lines on the condenser just above the normal service line set connections.

PC03 - Error code - low pressure protection.  This error is generally restriction related.  You should double check all of your line set connections at air handlers, condenser, and any extension couplers to make sure they are tightened down fully with no threads showing and that your service valves are opened all the way to the locking ring and slightly snugged.  If the unit is a multi-zone unit (not including dual zone gen 4 units), then you should also confirm that the king valves are opened on the two vertically running lines on the condenser just above the normal service line set connections.  After that, if the unit is still displaying PC03, then you should have pressures in the system checked to ensure that the unit has the correct pressure levels.

P3 - Error code - For a P3 on an Advantage system, this indicates that the outdoor ambient temperature is too low.  If outside temperatures are lower than -13 degrees for more than an hour it will show.  It can also be caused by the sensor being in ice, a dirty coil or low charge.  It can also very rarely be caused by temp sensor or board issues.

P4/PC04 - Error code - inverter compressor drive error.  This error is generally restriction related.  You should double check all of your line set connections at air handlers, condenser, and any extension couplers to make sure they are tightened down fully with no threads showing and that your service valves are opened all the way to the locking ring and slightly snugged.  If the unit is a multi-zone unit (not including dual zone gen 4 units), then you should also confirm that the king valves are opened on the two vertically running lines on the condenser just above the normal service line set connections.

PC08 - Error code - current overload protection.  Check AC electrical readings on the unit and confirm.

P6/PC06 - Error code - discharge temperature sensor.  This error is generally refrigerant related.  You should double check all of your line set connections at air handlers, condenser, and any extension couplers to make sure they are tightened down fully with no threads showing and that your service valves are opened all the way to the locking ring and slightly snugged.  While you're checking the fitting you can look for oil residue that could indicate a leak.  If the unit is a multi-zone unit (not including dual zone gen 4 units), then you should also confirm that the king valves are opened on the two vertically running lines on the condenser just above the normal service line set connections.  

P7 - Error code - USB Smart Controller module is not installed.

PCOL - Error code - Temperature outside is too low, condenser shut off for safety reasons

-- (double dash) - Error code - indoor unit modes conflict (one heating and another cooling).  Commonly seen in multi zone systems when the user is running the system in auto.  This is caused by one air handler trying to heat while another is trying to cool.

88+wifi symbol - Error code - indicates bad wiring configuration at the unit.  Confirm that your wiring is connected correctly at the condenser and air handler (wires 2 and 3 at the condenser are common mistakes).  If the unit is an existing install that has had no change to its wiring, then it could be a bad wire/etc.  DIY wires will generally run red, white, black/1 2 3.  Advantage wiring will depend on how they wired to the air handler, but is instructed to run red, black, white/1 2 3.

PC31 (outdoor board) - Error code - low pressure restriction or low pressure sensor disconnected.  You should double check all of your line set connections at air handlers, condenser, and any extension couplers to make sure they are tightened down fully with no threads showing and that your service valves are opened all the way to the locking ring and slightly snugged.  If the unit is a multi-zone unit (not including dual zone gen 4 units), then you should also confirm that the king valves are opened on the two vertically running lines on the condenser just above the normal service line set connections.

CF - Error Code - try raising/lowering the temperature by a couple degrees.

DF - Mode code - unit is currently running defrost mode at the condenser.

FP - Mode code - unit is currently running in freeze protection mode.

FC - Mode code - unit is currently running in forced cooling mode.