Friedrich Air Conditioner Error Codes

If you’re having trouble with your Friedrich AC, start by checking the error codes to troubleshoot the issue. 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!

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List of Friedrich AC Error Codes

Friedrich Portable Error Codes

错误代码	原因	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	原因
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.

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Friedrich Packaged Terminal AC Error Code List

错误代码	原因
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	跳线帽故障保护
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	除霜
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

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Numerical AC Error Code List

错误代码	原因	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

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Friedrich Heat Pump Error Code List

错误代码	原因
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

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Friedrich Multi Zone Air Conditioner Error Code List

错误代码	原因
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

If you’re experiencing issues with your unit, you can reach their support team online: https://www.friedrich.com/consumer/contact-us