P22 fault on sanyo dc outdoor unit,after changuing pcb,will error code still display and not work or auto reset? or what should i do once card is changed please?

you did not state what brand, here is the answer for Mitsubishi
Mitsubishi Electric define UF / U6 / UP faults as follows

• UF - Compressor overcurrent interruption (when compressor locked). Abnormal if overcurrent of DC bus or compressor is detected within 30 seconds after compressor starts operating.
• U6 - Power module abnormal. Check abnormality by driving power module in case overcurrent is detected. (UF or UP error condition).
• UP - Compressor overcurrent interruption. Abnormal if overcurrent DC bus or compressor is detected after compressor starts operating for 30 seconds.

Common issues that can cause U6 / UF / UP faults

• Failure or the Power PCB in outdoor unit
• Electrical failure or fusion of Compressor
• Seized bearings in the Compressor
• Disconnected/broken wiring to the compressor
• Closed service valves at outdoor unit
• Low voltage at outdoor unit

Tests to determine faulty components
Testing your Mitsubishi Electric air conditioner to determine the cause of a U6, UF or UP fault is relatively straight forward if you know what to look for. Below is the main checks to determine what component has caused this fault. These test are not DIY and will require a Mitsubishi Electric specialist to test correctly.
Disclaimer - Electricity is dangerous and can kill you. The following information is for educational purposes only. Tests must be performed by an authorised service provider or Mitsubishi Electric specialist. Do not try this to perform these test without the proper expertise and qualifications.

• Check for correct voltage at the outdoor unit, 240v or 415v
  • If power feed is incorrect, contact a licensed electrician or SA Power Networks to rectify power supply to unit/property
• Check both outdoor service valves are fully open
  • If valves are shut, open valves
• Check for visual damage to the Outdoor Power PCB. This could include lizard or rodent damage
  • If damage is found replace Power PCB then further test unit operation
• Check for visual damage to the wiring between the Power PCB and the compressor. This could include lizard or rodent damage
  • If damage is found, replace damaged cable
• Check for correct DC voltage to the compressor is equal and correct
  • If DC voltage is incorrect, replace Power PCB
• Check for equal voltage output from the Power PCB diodes using an inverter checker
  • If inverter checker LED's are unequal, replace Power PCB
• If the voltage and diodes have tested correctly and no visual damage is found, it is likely the compressor bearings have seized
  • The compressor will need to be replaced and the unit further tested

U4 - Communication error between indoor and outdoor units/outdoor and BS units - A mistake with the interconnection wires, or an indoor/outdoor PCB fault.

Daikin Air Conditioning Fault Codes Explained [Infographic ...

14.2.2 To Make a Diagnosis1 Timer LED starts to blink and the unit automatically stops the operation.
2 Press the CHECK button on the remote control continuously for 5 seconds.
3 "- -" will be displayed on the remote control display.
Note: Display only for "- -" (No signal transmission, no receiving sound and no Power LED blinking)
4 Press the TIMER ? or ? button on the remote control. The code "H00" (no abnormality) will be displayed
and signal will be transmit to the main unit.
5 Each press of the button (? or ?) will increase error code
number and transmit error code signal to the main unit.
6 When the latest abnormality code on the main unit and
code transmitted from the remote control are matched,
Power LED will light up for 30 seconds and a "beep" sound
(continuously for 4 seconds) will be heard. If no codes are
matched, Power LED will light up for 0.5 seconds and no
sound will be heard.
7 The breakdown diagnosis mode will be canceled unless
pressing the CHECK button continuously for 5 seconds or
operating the unit for 30 seconds.
8 The LED will be off if the unit is turned off or the RESET
button on the main unit is pressed.
Diagnosis
display Abnormality / Protection control Abnormality
Judgement Emergency operation Primary location to verify H00 No abnormality detected - Normal operation H11 Indoor / Outdoor abnormal communica
tion > 1 min after starting
operation Indoor fan operation
only • Internal / external cable connections
• Indoor / Outdoor PCB H14 Indoor intake air temperature sensor
abnormality Continue for 5 sec. - • Intake air temperature sensor (detec
tive or disconnected) H15 Outdoor compressor temperature sensor
abnormality Continue for 5 sec. - • Compressor temperature sensor
(detective or disconnected) H16 Outdoor Current Transformer open cir
cuit - - • Outdoor PCB
• IPM (Power transistor) module H19 Indoor fan motor mechanism locked 7 times occurance
continuously - • Indoor PCB
• Fan motor H23 Indoor heat exchanger temperature sen
sor abnormality Continue for 5 sec. O
(Cooling only) • Heat exchanger temperature sensor
(detective or disconnected) H24 Indoor heat exchanger temperature sen
sor 2 abnormality Continue for 5 sec. - • Heat exchanger temperature sensor
(detective or disconnected) H27 Outdoor intake air temperature sensor
abnormality Continue for 5 sec. O • Outdoor temperature sensor (detec
tive or disconnected) H28 Outdoor heat exchanger temperature
sensor abnormality Continue for 5 sec. O • Outdoor heat exchanger temperature
sensor (detective or disconnected) H30 Outdoor discharge air temperature sen
sor abnormality Continue for 5 sec. - • Outdoor temperature sensor (detec
tive or disconnected) H33 Indoor / Outdoor wrong connection - - • Indoor / Outdoor supply voltage H38 Indoor / Outdoor mismatch (brand code) H50 Ventilation motor abnormality 7 times occurance
continuously - • Indoor PCB
• Ventilation motor H51 Nozzle lock abnormality 2 times occurance
continuously - • Nozzle H52 Limit switch abnormality - - • Indoor PCB H97 Outdoor fan motor mechanism locked 2 times occurance
within 30 minutes - • Indoor PCB
• Fan motor H98 Indoor high pressure protection - - • Air filter dirty
• Air circulation short circuit H99 Indoor heat exchanger anti-freezing pro
tection - - • Insufficient refrigerant
• Air filter dirty F11 Cooling / Heating cycle changeover
abnormality 4 times occurance
within 30 minutes - • 4-way valve
• V-coil F90 PFC control 4 times occurance
within 10 minutes - • Voltage at PFC F91 Refrigerantion cycle abnormality 2 times occurance
within 20 minutes - • No refrigerant
(3-way valve is closed) F93 Compressor rotation failure 4 times occurance
within 20 minutes - • Compressor F95 Cool high pressure protection 4 times occurance
within 20 minutes - • Outdoor refrigerant circuit F96 IPM (power transistor) overheating pro
tection 4 times occurance
within 30 minutes - • Excess refrigerant
• Improper heat radiation
• IPM (Power transistor) F97 Outdoor compressor overheating protec
tion 4 times occurance
within 10 minutes - • Insufficient refrigerant
• Compressor F98 Total running current protection 3 times occurance
within 20 minutes - • Excess refrigerant
• Improper heat radiation F99 Outdoor Direct Current (DC) peak detec
tion 7 times occurance
continuously - • Outdoor PCB
• IPM (Power transistor)
• Compressor

Note:
"O" - Frequency measured and fan speed fixed.
The memory data of error code is erased when the power supply is cut off, or press the Auto Switch until "beep" sound heard following by pressing the "CHECK" button at remote controller.
Although operation forced to stop when abnormality detected, emergency operation is possible for certain errors (refer to Error Codes Table) by using remote controller or Auto Switch at indoor unit. However, the remote controller signal receiving sound is changed from one "beep" to four "beep" sounds.

Feature : E7 Error code on indoor unit display panel

• Answer :Reason:
  Communication fault between indoor and outdoor unit
  Solution:
  This may be caused by:
  1.wrong connection of cable,
  2.indoor PCB, outdoor PCB fault, or power module fault
  3.cable connection loose
  

P05-Current value sent from MDC on outdoor unit control PCB is low. No AC power input for 3
minutes or longer: pre-trip - 5

Solution:
1. Check R/S/T power.
2. Check inverter control PCB.
3. Check outdoor unit control
PCB.

Thanks.

There is no CS code. Please read as C5.
Fault Code 05 and 53 (CH05 is displayed at indoor unit, 53 is displayed at outdoor unit)
This fault code indicates a communication error between the indoor and outdoor units; this is usually caused
by wiring errors or condensate pumps connected to the inter-connecting cable.
The communication between the units is a fluctuating DC voltage commonly called a serial signal, it can be
easily lost if the wiring is not done correctly. If there is a communication error fault CH05 will appear within 5
mins of powering up the system.
Testing
• Check Outdoor and Indoor Power Supply Voltages ( 230V ±10% ) and correct as necessary.
• Check for any mis-wiring or loose connections and correct as required.
• Check the resistance between communication line and GND. (Normal: Over 2M).
• If one Indoor unit operates normally Outdoor PCB is generally normal.
Turn on the power and start the indoor unit in cooling, set the temperature to 18ºC; the serial communication
signal will only be present for the first 3 mins of operation.
Set your meter to DC Volts, Test between terminals 5 (Red probe) and 2 or Earth (Black probe) of the outdoor
unit, you should see a fluctuating 0-72 Vdc.
If the Voltage is not present disconnect the terminal 5 cable, test the Voltage between this wire (Red probe)
and 2 or Earth (Black probe), you should see a steady voltage in the range of -0.1 to -10.0 Vdc. If No Voltage
is present either the cable or Indoor PCB must be faulty. This can be determined by checking the voltage
output on the Comms terminal of the Indoor unit, with the Comms wire disconnected. If No Voltage is present
the Indoor PCB must be faulty, if present, cable must be at fault.

Fault Code 05.
This fault code indicates a communication error between the indoor and outdoor units; this is usually caused
by wiring errors or condensate pumps connected to the inter-connecting cable.
The communication between the units is a fluctuating DC voltage commonly called a serial signal, it can be
easily lost if the wiring is not done correctly. If there is a communication error fault CH05 will appear within 5
mins of powering up the system.
Testing
• Check Outdoor and Indoor Power Supply Voltages ( 230V ±10% ) and correct as necessary.
• Check for any mis-wiring or loose connections and correct as required.
• Check the resistance between communication line and GND. (Normal: Over 2M).
• If one Indoor unit operates normally Outdoor PCB is generally normal.
Turn on the power and start the indoor unit in cooling, set the temperature to 18ºC; the serial communication
signal will only be present for the first 3 mins of operation.
Set your meter to DC Volts, Test between terminals 5 (Red probe) and 2 or Earth (Black probe) of the outdoor
unit, you should see a fluctuating 0-72 Vdc.
If the Voltage is not present disconnect the terminal 5 cable, test the Voltage between this wire (Red probe)
and 2 or Earth (Black probe), you should see a steady voltage in the range of -0.1 to -10.0 Vdc. If No Voltage
is present either the cable or Indoor PCB must be faulty. This can be determined by checking the voltage
output on the Comms terminal of the Indoor unit, with the Comms wire disconnected. If No Voltage is present
the Indoor PCB must be faulty, if present, cable must be at fault. Helpful?

To work out what the error code is press the orange start/stop button on the remote controller so unit operation is stopped.
Then press and hold "energy save" and "zone control" button simultaneously for at least five seconds, the error code will be along the lines of En:nn where the "En:" is the error code and the ":nn" indicates the indopor unit address if there are multiple indoor units connected to the one controller. If the upper vertical bar on the capital E is missing so it looks maybe like a 2 or something don't worry for some reasons they just do that
Some common error codes are:
E0 Communication error between indoor unit and wired remote control, check if there is 12VDC between terminal 1 + 3 at remote control and 8-9VDC pulsating between terminal 2 + 3. If DC volts out of Indoor pcb is below about 11.6VDC it will cause this error, the problem is normally dry capacitors in the 12 VDC power supply section. This model has two power supply sections on indoor pcb.
E1 Communication error between indoor unit and outdoor unit,
EF Discharge temperature abnormal