I have error code 4-2 on my display on the wall mounted remote. The door seems to be operating ok

To display memorized error (Protective operation)
status:
1. Turn power on.
2. Press the CHECK button on the remote controller
continuously for 5 seconds.
3. "- -" will be displayed on the remote controller display.
Note: Display only for "- -". (No transmitting signal, no
receiving sound and no Power LED blinking.)
4. Press the "TIMER" or button on the remote
controller. The code "H00" (no abnormality) will be
displayed and signal will be transmitted to the main
unit. The power LED lights up. If no abnormality is
stored in the memory, three beeps sound will be
heard.
5. Every press of the button (up or down) will increase
abnormality numbers and transmit abnormality code
signal to the main unit.
6. When the latest abnormality code on the main unit
and code transmitted from the remote controller 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 same diagnosis can be repeated by turning
power on again.
• To clear memorized error (Protective operation) status after repair:1. Turn power on.
2. Press the AUTO button for 5 seconds (A beep
receiving sound) on the main unit to operate the unit
at Forced Cooling Operation mode.
3. Press the CHECK button on the remote controller for
about 1 second with a pointed object to transmit
signal to main unit. A beep sound is heard from main
unit and the data is cleared.
• Temporary Operation (Depending on breakdown status)
1. Press the AUTO button (A beep receiving sound) on
the main unit to operate the unit. (Remote control will
become possible.)
2. The unit can temporarily be used until repaired

Hi Anonymous,
For all wall mounted and Artcool split system codes

Error code = C1 or CH1
Flashing Light = 1
Fault = Indoor temperature sensor open or closedcircuit.
Display = Indoor.
Indoor Operation = ON

Error code = C2 or CH2
Flashing Light = 2
Fault = Outdoor temperature sensor open orclosed circuit.
Display = Indoor Outdoor.
Indoor Operation = ON

Sounds like a faulty outdoor controller board. If you are in Australia, call Prime Electronics or Statewide Appliances for spares.
Part number: NPCWA743383

• To make a diagnosis
1. Timer LED start to blink and the unit automatically stops the operation.
2. Press the CHECK button on the remote controller continuously for 5 seconds.
3. "- -" will be displayed on the remote controller display.
Note: Display only for "- -". (No transmitting signal, no
receiving sound and no Power LED blinking.)
4. Press the "TIMER" or button on the remote controller. The code "H00" (no abnormality) will be displayed and signal will be transmitted to the main unit.
5. Every press of the button (up or down) will increase abnormality numbers and transmit abnormality code signal to the main unit.
6. When the latest abnormality code on the main unit and code transmitted from the remote controller 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 by pressing the CHECK button continuously for 5 seconds or without any operation the remote control 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.

Or better yet, get a tech to check first.

Hi Tania,
Have you gone through this checking sequence.? it's from a Panasonic a/c manual. It could be something as simple as a clogged filter. Once you have rectified the fault, you will probably have to clear the fault code as described at bottom below, before it will condescend to work again.
David

• Once error occurred during operation, the unit will stop its operation, and Timer LED blinks.
• Although Timer LED goes off when power supply is turned off, if the unit is operated under a breakdown condition, the LED will ON again.
• In operation after breakdown repair, the Timer LED will not blink. The last error code (abnormality) will be stored
  in IC memory.

14.2.2 To Make a Diagnosis

1. 1 Timer LED starts to blink and the unit automatically stops the operation.
2. 2 Press the CHECK button on the remote control continuously for 5 seconds.
3. 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. 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. 5 Each press of the button (? or ?) will increase error code number and transmit error code signal to the main unit.
6. 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. 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. 8 The LED will be off if the unit is turned off or the RESET button on the main unit is pressed.

14.2.3 To Display Memorized Error Code (Protective Operation)

1. 1 Turn power on.
2. 2 Press the CHECK button on the remote control
3. 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. 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. 5 Each press of the button (? or ?) will increase error code number and transmit error code signal to the main
   unit.
6. 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. 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. 8 The same diagnosis can be repeated by turning power on again.

14.2.4 To Clear Memorized Error Code after Repair (Protective Operation)

1. 1 Turn power on (in standby condition).
2. 2 Press the AUTO button for 5 seconds (a "beep" sound is heard) on the main unit to operate the unit at Forced Cooling Operation Mode.
3. 3 Press the CHECK button on the remote control for about 1 second with a pointed object to transmit signal to
   main unit. A "beep" sound is heard, and the Error Code is cleared

Check to see if the wall control has 3 buttons. If it does one of them is the lock button and you need to press and hold this for 3 seconds. The lock button has an icon of a padlock. If you do not have a 3 button wall control programming the remotes should cure it.

It sounds like you have a problem with your wall button. I would remove the button from the wall and then disconnect the 2 wires on the back. Remember where they go as they are color coded. You can then momentarily touch the two wires together to check the operation. There isn't enough voltage there to bother you.

One thing to remember. If when the door reverses the main light flashes 10 times it is a door sensor problem and nothing else.

Press and hold for 3 seconds the button on the wall control with the lock icon.

The sensor eye - or more likely, the other end, the sensor light - probably got knocked out of alignment. The eye should have an LED on it - possibly one that glows green when it's ready to close or red when it's obstructed or out of alignment. Try adjusting the light until the LED on the receiver glows green.

Make sure the code set inside the remote is the same as in the main reciving unit code.

Hello,
Wire the two openers in parallel. If its wireless, set both to the same code.