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Friedrich Air Conditioner Error Codes

Error codes

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Troubleshooting error codes often requires the expertise of a licensed technician, but there are a few error codes you can easily fix at home. When you've encountered a problem with your Friedrich air conditioner, check out our troubleshooting guide and error code list to help you solve the issue at home!

List of Friedrich AC Error Codes

Friedrich Portable Error Codes

Error Code Meaning Possible Cause Solution
E1 Electrical sensor is short on both temperature and PCB. Refrigeration system error code. There may be a broken or short circuit on the ambient temperature sensor. Check if this is a sensor problem. If not, contact the technician to replace the PCB.
E2 Lack of power of temperature sensor copper tubes and PCB wires. Defective sensor error code. There may be a broken or short circuit on the brass temperature sensor (applicable only to the COOL / heat unit). Check if this is a sensor problem. If not, contact a technician to inspect the unit.
E4 Poor connection to the water tank. The signal indicates incomplete or poor contact to the unit's water tank. Take out the rubber stopper which is located at the bottom of the unit, allowing water to drain out. Check the plug is wired correctly.

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Friedrich Window AC Error Code List

AC Error Code Meaning
CH01 Discharge Air Temperature Sensor Error. Indoor air sensor open or small.
CH09 EEPROM read date error.
CH34 High pressure error. At high pressure, compile more than 10 bars in 1 hour.

Friedrich Packaged Terminal AC Error Code List

Error Code Meaning
E1 High pressure system protection
E2 Anti freezing protection
F0 Refrigerant defects
E4 High discharge temperature protection of compressor
E5 Overcurrent Protection
E6 Communication malfunction
E8 High Temperature Resistant Protection
EE EEPROM Malfunction
EU Frequency reduction due to high temperature of module
C5 Jumper cap malfunction protection
DC Bus bar PL voltage is too low
F1 Indoor ambient temperature sensor is open / small circuit
F2 Indoor evaporator temperature sensor is open / small circulated
F3 Outdoor ambient temperature sensor is open / small circulated
F4 Outdoor condenser temperature sensor is open / small circulated
F5 Outdoor discharge temperature sensor is open / small circulated
F6 Decrease frequency due to overload
F8 Frequency decrease due to overcrack
F9 Reduction in frequency of due to high air discharge
FH Decrease frequency due to anti freezing
H0 Frequency of decreases due to high temperature resistor during heating operation
H1 Defrosting
H2 Static surrender protection
H3 Overload protection for compressor
H4 System is abnormal
H5 IPM Security
H6 Internal motor (fan motor) does not operate
H7 Desynchronizing of Compressor
HC PFC Security
L3 Outdoor DC Fan Motor Malfunction
L9 Power Protection
LC Failure startup
LP Does not match indoor unit and outdoor unit
P0 Compressor minimum frequency in test state
P1 Compressor rated frequency at test stage
P2 Compressor maximum frequency in test state
P3 Compressor intermediate frequency in test state
P5 Overload protection of phase current for compressor
P7 Module temperature sensor circuit malfunction
P8 Module High Temperature Protection
PH Voltage too high for DC bus bar
U1 Malfunction of phase current detection circuit for compressor
U3 Malfunction of voltage dropping for DC bus bar
U5 Malfunction current detection of complete units
U7 Four-way valve is abnormal
U9 Zero-crossing Outdoor Unit Malfunction

Numerical AC Error Code List

Error Code Meaning Solution
Error Code: 02 Extremely low voltage conditions exist 198V for 230V units and 239V for 265V units Shutdown unit
Error Code: 03 Return air thermistor sensor open or short circuit Set the return air sensor = 75 ° F
Error Code: 04 Indoor coil temperature sensor open or short circuit Set ID coil temp = 40 ° F
Error Code: 05 Outdoor coil thermistor sensor open or short circuit Set indoor coil temp = 20 ° F.
Error Code: 06 Outdoor coil temperature over 175 °F Shut down unit for 5 minutes
Error Code: 07 Indoor coil temperature is below 30 ° F Shut down unit for 5 minutes. The compressor remains closed until the indoor coil thermistor reaches 45 ° F.
Error Code: 08 Low load conditions Contact technician
Error Code: 09 High load conditions Contact technician
Error Code: 10 Room Freeze Protection Trigger Keep unit running

Friedrich Heat Pump Error Code List

Error Code Meaning
E1 SHORT CYCLE SITUATION: Defined as a compressor that starts and stops more often (more than 6 times per hour).
E1 SHORT CYCLE SITUATION: Defined as a compressor that starts and stops more often (more than 6 times per hour).
E2 KEYBOARD ERROR: If a key button is stuck or pressed for 20 seconds or more, the unit gets stuck. If the key is stuck, it will be ignored until
E2 KEYBOARD ERROR: If the key button is stuck or pressed for 20 seconds or more, the unit gets stuck. If the key is stuck, it will be ignored unt
E3 AMBIENT (INDOOR) AIR PROBE OPEN or SHORT: Control will assume ambient temperature is 90 ° F when in cool mode and 60 ° F when in heat mode. The unit
E3 FROST PROBE OPEN: Normal operation allowed. Change the probe.
E4 EVAPORATOR TEMPERATURE PROBE OPEN or SHORT: Normal operation allowed. Change the probe.
E4 FROST PROBE SHORT: Normal operation allowed. Change the probe.
E5 CONDENSER TEMPERATURE PROBE OPEN OR SHORT: Normal operation allowed. Change the probe.
E5 INDOOR PROBE OPEN: The control assumes that the indoor ambient temperature is 90 degrees F and the unit will operate. Change the probe.
E6 INDOOR PROBE SHORT: The control assumes that the ambient temperature is 90 degrees F and the unit will operate. Change the probe.
E7 Motor operation error
E9 Heat pump failure

Friedrich Multi Zone Air Conditioner Error Code List

Error Code Meaning
00 No error
01 Indoor room themster error
02 Indoor in-piping sensor error
03 Remote controller error
04 Drain pump error
05 Communal error within and outside
06 Indoor out-piping sensor error
07 Different Mode Operation
09 EEPROM even error check
10 Indoor BLDC Fan Lock
21 DC Peak (IPM Error) – Over rated current off
22 CT2 (Max CT) – input of current off
23 DC Link Low Voltage – DC link voltage is below 140Vdc off
24 LP / HP Switch – Low / High Press Switch Open Close
25 Low voltage / over-voltage – abnormal AC voltage input off
26 DC Compressor Status Error – Compressor Start Fall Collapse Error
27 PSC / PFC error – inverter PCB input current is over100A (peak) for 2us off
28 DC Link High Voltage – Closed
29 Overcurrent error – inverter compressor turned off
32 D-Pipe High (INV) – Off Off
40 CT sensor (short/open) – CT circuit malfunction
41 INV. D-Pipe threshold – Open / Short Off
44 Outdoor Air threshold – Open / Short Off
45 Condenser Pipe threshold fault – Open / Short Off
46 Suction Pipe Fault – Short/Open Off
51 Overcapacity error - overloaded
52 Signal error between DSP board and main board
53 Signal error between indoor unit and outdoor unit.
61 Condenser Pipe threshold High
62 Heat Sink threshold High-Heat Temp. Drunk
65 Heat Sink threshold – Open / Short Off
67 Outdoor BLDC Fan Lock – Outdoor Fan Is Not Running Off
73 PFC Fault Error (S / W) – Overall Outdoor Unit PFC

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Staff Writer

This article is written by our passionate staff writers who seek to share our knowledge from our business

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