Friedrich AC
Error Codes| Troubleshooting
The Frederich Smart Center constantly
monitoring the operation of the PT-AC unit and will store the service code if
certain conditions are witnessed. In some cases the unit may take action and
shut down the unit until the conditions are corrected.
PTAC – PD Series
Packaged Terminal Air Conditioner
Packaged Terminal Heat Pumps
Packaged Terminal Air Conditioner
Packaged Terminal Heat Pumps
Error code problem
E1 high pressure
system protection
E2 antifreezing
protection
F0 in refrigerant
defects
E4 High discharge
temperature protection of compressor
E5 Overcrout
Protection
E6 communication
malfunction
E8 High Temperature
Resistant Protection
EE EEPROM Malfunction
EU limit / freq-uency
reduction due to high temperature of module
C5 jumper cap
malfunction protection
Foam collecting refrigerant
Foam collecting refrigerant
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 limit / decrease freq-uency
due to over lode
F8 freq-uency decrease
due to overcrack
F9 Reduction in
freq-uency of due to high air discharge
FH limit / decrease
freq-uency due to antifreezing
PH voltage too high
for DC bus bar
DC bus bar PL voltage
is too low
P0 compressor minimum
freq-uency in test state
P1 compressor rated
freq-uency at test stage
P2 compressor maximum
freq-uency in test state
P3 compressor
intermediate freq-uency in test state
P5 Overcrack
protection of phase current for compressor
Capacitor PU charging fault
Capacitor PU charging fault
P7 module temperature
sensor circuit malfunction
P8 Module High
Temperature Protection
H0 freq-uency of
decreases due to high temperature resistor during heating operation
H1 Defrosting
H2 static surrender
protection
H3 over lode
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
LP does not match
indoor unit and outdoor unit
LC failure startup
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 Zerocrossing
Outdoor Unit Malfunction
Digital Control Diagnostics and Test Mode
Digital Control Diagnostics and Test Mode
Error Code: 02
Code Translation: Extremely low voltage conditions exist <198V for 230V units and <239V for 265V units
Action taken by the unit: shutdown unit. Display error code and flash. Power is restored once the voltage is increased for the normal level system
Possible reasons:
Supply insufficient power supply
Defector§
Use Blown Fuse
Code Translation: Extremely low voltage conditions exist <198V for 230V units and <239V for 265V units
Action taken by the unit: shutdown unit. Display error code and flash. Power is restored once the voltage is increased for the normal level system
Possible reasons:
Supply insufficient power supply
Defector§
Use Blown Fuse
Error Code: 03
Code Translation: Return air thermistor sensor open or short circuit
Action taken by the unit: set the return air sensor = 75 ° F. Optional flash set point and error code. Quit running unit
Possible Cause: Defective sensor
Code Translation: Return air thermistor sensor open or short circuit
Action taken by the unit: set the return air sensor = 75 ° F. Optional flash set point and error code. Quit running unit
Possible Cause: Defective sensor
Error Code: 04
Code translation: Indoor coil thermistor sensor open or short circuit
Action taken by the unit: Set ID coil temp = 40 ° F. Optional flash set point and error code. Quit running unit
Possible Cause: Defective sensor
Code translation: Indoor coil thermistor sensor open or short circuit
Action taken by the unit: Set ID coil temp = 40 ° F. Optional flash set point and error code. Quit running unit
Possible Cause: Defective sensor
Error Code: 05
Code Translation: Outdoor coil thermistor sensor open or short circuit
Action taken by the unit: setaud coil temp = 20 ° F. Optional flash set point and error code. Automatically change to electric heat mode only. Quit running unit
Possible Cause: Defective sensor
Code Translation: Outdoor coil thermistor sensor open or short circuit
Action taken by the unit: setaud coil temp = 20 ° F. Optional flash set point and error code. Automatically change to electric heat mode only. Quit running unit
Possible Cause: Defective sensor
Error Code: 06
Code Translation: If O.D. Coil temperature> 175 deg F for 2 consecutive minutes. (Heat pump model only)
Action taken by the unit: optional flash set point and error code. Shut down unit for 5 minutes, then try again 2 times, if it fails for the 3rd time, close the unit.
Possible reasons:
Coil Dirty Coil
Failure Fan Motor Malfunction
Restricted air flow§
. Non-condensation in refrigeration system
Code Translation: If O.D. Coil temperature> 175 deg F for 2 consecutive minutes. (Heat pump model only)
Action taken by the unit: optional flash set point and error code. Shut down unit for 5 minutes, then try again 2 times, if it fails for the 3rd time, close the unit.
Possible reasons:
Coil Dirty Coil
Failure Fan Motor Malfunction
Restricted air flow§
. Non-condensation in refrigeration system
Error Code: 07
Code translation: ID coil temperature <30 deg for 2 consecutive minutes
Action taken by the unit: optional flash set point and error code. The compressor remains closed until the indoor coil thermistor reaches 45 ° F, and then continue operating the fan, activating the compressor. However, the compressor must still wait for a lockout time of 180 to 240 seconds
Possible reasons:
Filters Dirty Filters
Coil Dirty Coil
Failure Fan Motor Malfunction
Restricted airflow§
Improper refrigerant charge§
. Restriction in refrigerant circuit
Code translation: ID coil temperature <30 deg for 2 consecutive minutes
Action taken by the unit: optional flash set point and error code. The compressor remains closed until the indoor coil thermistor reaches 45 ° F, and then continue operating the fan, activating the compressor. However, the compressor must still wait for a lockout time of 180 to 240 seconds
Possible reasons:
Filters Dirty Filters
Coil Dirty Coil
Failure Fan Motor Malfunction
Restricted airflow§
Improper refrigerant charge§
. Restriction in refrigerant circuit
Error Code: 08
Code translation: if unit cycle (heat or cold demand)> 9 times per hour
Action taken by the unit: optional flash set point and error code. Keep unit running
Possible reasons:
Unit§ Maintenance
Low load§ conditions
Code translation: if unit cycle (heat or cold demand)> 9 times per hour
Action taken by the unit: optional flash set point and error code. Keep unit running
Possible reasons:
Unit§ Maintenance
Low load§ conditions
Error Code: 09
Code translation: if unit cycle (heat or cold demand) <3 times per hour
Action taken by the unit: optional flash set point and error code. Keep unit running
Possible reasons:
Un unit underestimated
High Load§ Conditions
Code translation: if unit cycle (heat or cold demand) <3 times per hour
Action taken by the unit: optional flash set point and error code. Keep unit running
Possible reasons:
Un unit underestimated
High Load§ Conditions
Error Code: 10
Code Translation: Room Freeze Protection Trigger
Action taken by the unit: optional flash set point and error code. Keep unit running
Possible reasons: room temperature drops below 40 ° F
Code Translation: Room Freeze Protection Trigger
Action taken by the unit: optional flash set point and error code. Keep unit running
Possible reasons: room temperature drops below 40 ° F
