What does LG AC error code CH 01 mean?

CH 01 indicates a communication error between the indoor unit and system, usually caused by wiring issues or connection failure.

How do I fix LG CH 03 error?

Check drain hose blockage, inspect drain pump, clean drain pan, and restart the unit.

Is LG CH 38 dangerous?

Yes. CH 38 indicates a refrigerant leak. Turn off immediately and contact a technician.

Can LG AC errors reset automatically?

Some errors reset after turning off power for 5–10 minutes and restarting the unit.

Why does my LG air conditioner keep showing error codes?

Common causes include sensor failure, dirty filters, wiring issues, or unstable power supply.

When should I call a technician for LG AC errors?

Call a technician if there is compressor failure, refrigerant leak, PCB issue, or repeated errors after reset.

Canon Printer Error Codes

Complete Canon Printer Guide

This guide explains all Canon Printer error codes (CH series) with simple troubleshooting steps to help you identify and fix common issues safely before calling a technician.

READY

Canon Printer Ready Status

Printer is powered on and ready for use.
No action required.
Start printing jobs normally.
Ensure device is selected as default printer.

ERR 01

Print Head Communication Failure

Remove and reinstall ink cartridges.
Clean cartridge contacts gently.
Check compatibility of ink cartridges.
Restart printer to reset system.

ERR 02

Paper Feed / Tray Issue

Reload paper correctly into tray.
Adjust paper guides properly.
Remove any jammed paper.
Clean feed rollers if needed.

ERR 05

Ink System Error

Check ink levels and replace if low.
Reinstall ink cartridges properly.
Run ink system reset or cleaning.
Restart printer.

ERR 06

Scanner Unit Malfunction

Restart printer/scanner device.
Clean scanner glass surface.
Ensure lid is fully closed.
Update printer firmware.

ERR 10

Print Job / File System Error

Clear print queue.
Restart printer and computer.
Resend document to print.
Check file format compatibility.

ERR 20

Mechanical Feed Failure

Check paper path for obstructions.
Remove jammed paper carefully.
Inspect rollers for wear or dust.
Service feed mechanism if needed.

ERR 30

Internal System Fault

Restart printer.
Unplug power for 1 minute.
Update firmware if available.
Contact service center if unresolved.

ERR 40

Power Supply Error

Check power cable and outlet.
Try a different power source.
Inspect adapter for damage.
Replace power unit if needed.

ERR 50

Main Board Communication Failure

Restart printer system.
Check internal ribbon cables.
Update firmware.
Replace main board if required.

ERR 60

Print Head Alignment Failure

Run print head alignment tool.
Clean print head nozzles.
Use recommended paper type.
Replace print head if needed.

ERR 70

Print Processing Error

Restart printer and computer.
Clear print queue.
Update printer driver.
Reduce print job size.

ERR 80

Electrical System Fault

Turn off and unplug printer.
Check for moisture or dust inside.
Inspect wiring connections.
Service internal board.

ERR 90

Paper Jam System Error

Remove jammed paper carefully.
Check rollers and feed path.
Reload paper correctly.
Clean paper sensors.

ERR 100

Memory Write Failure

Clear print queue.
Restart printer.
Reduce large print jobs.
Update firmware.

ERR 110

Ink Cartridge Recognition Issue

Reinsert ink cartridges properly.
Clean cartridge contacts.
Use compatible cartridges only.
Replace faulty cartridge.

ERR 120

Overheating Warning

Turn off printer and allow cooling.
Improve ventilation around device.
Avoid continuous heavy printing.
Remove dust buildup.

ERR 130

USB / Network Connection Failure

Check USB or LAN cable connection.
Restart router and printer.
Reinstall printer drivers.
Try different cable or port.

ERR 140

Firmware Conflict

Reset printer settings.
Update to latest firmware.
Remove external accessories.
Perform factory reset if needed.

ERR 999

Unknown System Error

Restart printer.
Unplug power cable and reconnect.
Check all connections.
Contact Canon support.

FAQ

Canon Printer Common Issues

Check power and connection if printer is not printing.
Ensure Wi-Fi or USB connection is stable.
Replace ink cartridges if print quality is poor.
Restart device to fix temporary errors.

FAQ

Canon Printer Connectivity Issues

Verify Wi-Fi password and network settings.
Move printer closer to router if signal is weak.
Restart router and printer.
Reinstall printer driver if needed.

FAQ

Canon Printer Maintenance

Clean print heads regularly.
Use proper paper type and size.
Keep firmware updated.
Avoid long continuous printing sessions.

Frequently Asked Questions

What does PRN01 Canon Printer Not Ready mean?

Check power connection, ensure printer is turned on, verify USB or Wi-Fi connection, and restart printer and computer.

What does PRN02 Blank Print Output Detected mean?

Check ink cartridges, run print head cleaning, ensure correct print settings, and replace empty or clogged cartridges.

What does PRN03 Printer Offline / Not Responding mean?

Check USB or Wi-Fi connection, restart printer and computer, set printer as default, and clear print queue.

What does PRN04 Wi-Fi Connection Failure mean?

Verify Wi-Fi password, restart router and printer, move closer to router, and reconfigure wireless settings.

What does PRN05 Poor Print Quality Detected mean?

Check ink levels, clean print head, use correct paper settings, and align print head if needed.

What does PRN06 Streaks or Lines on Print mean?

Clean print head and nozzles, remove dust inside printer, check ink cartridges, and run deep cleaning cycle.

What does PRN07 Paper Jam Detected mean?

Remove jammed paper carefully, check rollers for debris, reload paper properly, and ensure correct paper size.

What does PRN08 Multi-Feed Paper Error mean?

Fan paper before loading, avoid overloading tray, clean rollers, and use dry flat paper.

What does PRN09 Unusual Noise Detected mean?

Check for foreign objects, inspect rollers, clean internal parts, and stop use if noise continues.

What does PRN10 Printer Not Detected mean?

Check USB or network connection, reinstall drivers, try different port, and restart devices.

What does PRN11 Slow Printing Performance mean?

Lower print quality, close background apps, check network stability, and restart printer.

What does PRN12 Print Job Not Saving or Stuck mean?

Clear print queue, check storage space, restart print spooler, and reinstall printer driver.

What does PRN13 Connection Instability mean?

Replace USB cable, check Wi-Fi signal, update firmware, and restart router and printer.

What does PRN14 Print Interrupted Error mean?

Check paper feed, remove jams, restart print job, and update drivers.

What does PRN15 General System Failure mean?

Restart printer, reset settings, check power connection, and contact support if issue persists.

What does PRN16 Overheating Warning mean?

Turn off printer, allow cooling, ensure ventilation, and avoid continuous heavy printing.

What does PRN17 Restart Loop Detected mean?

Check power supply, update firmware, reset settings, and inspect internal hardware.

What does PRN18 Power Failure mean?

Check power cable, test outlet, inspect adapter, and replace faulty power supply if needed.

What does PRN19 Network Connection Lost mean?

Restart router, reconnect Wi-Fi, check network stability, and update network settings.

What does PRN20 System Reset Required mean?

Power off printer, wait 30–60 seconds, restart system, and test printer operation.

What does PRN21 Memory Overflow Error mean?

Reduce print size, clear queue, restart printer, and update firmware if needed.

What does PRN22 Maintenance Required mean?

Clean print head, check rollers, run calibration, and replace worn parts if needed.

Important: Always disconnect power before performing repairs. Contact a qualified technician if the issue persists.