Troubleshoot error code “H11” in Panasonic air-conditioning

  • Error: H11
  • Description: Communication problem between the internal and external cards of the air conditioner.
  • Cause: Voltage signal failure between the cards.
  • Solution: Review and possibly replace the affected cards.

If you’re here, your Panasonic air conditioner is likely causing headaches with an “H11” error message. Don’t worry; we’ll help you understand what it means and guide you through the steps to fix it without becoming an electronics expert.

What is H11 Code?

The H11 code on your Panasonic air conditioner is like a distress call between two friends who are not understanding each other. Imagine that the internal card and the external card are two people trying to talk on malfunctioning phones. H11 appears when these “people” cannot communicate properly.

Why is Card Communication Important?

When you turn on your air conditioner, these cards (one inside your house and the other outside) start sending electrical signals to coordinate how to cool your space. If one doesn’t receive the message from the other, they simply can’t do their job.

Steps to Review H11 Error

Before starting: Safety first! Always disconnect the air conditioner before any review. This is like pausing the game to avoid unpleasant surprises.

Review Connections

  1. Check connections:
    • Ensure that the cables are securely connected to the cards, both inside and outside your house. Think of this as making sure your headphone cables are well plugged in to listen to music without interruptions.

Measurements with Multimeter

  1. Measurement in the external unit:
    • Using a multimeter, measure the voltage between terminals 2 and 3 of the external unit. You should see values ranging from 20 to 70 VDC. If not, the external card may be damaged and need replacement.
  2. Measurement in the internal unit:
    • Now, make the same measurement in the internal unit. Here, you should see values between 20 and 50 VDC. If not, the internal card could be in trouble.

Important Note: If you make these measurements while the air conditioner displays the H11 error, you won’t be able to determine which card is failing. It’s like trying to figure out who missed the date without checking if anyone sent a message. You have to restart the system (lowering and raising the breaker or doing a reset with the remote control) before taking measurements.

Why Does This Happen?

Panasonic air conditioners are like high-performance athletes among appliances: efficient and energy-saving. But, like any athlete, inappropriate conditions can affect them. In this case, we’re talking about voltage fluctuations that can give the cards an “electrical shock” and damage them. That’s why it’s a good idea to have voltage protectors or transient meters to protect your equipment.

Need Replacement Parts?

If, after all these tests, you discover that you need a new card, whether for the internal or external unit, at, we can help you find the Panasonic spare parts you need.

Remember, if you don’t feel confident performing these tests or if you prefer a professional to take a look at your air conditioner, it’s always better to contact an authorized technician. Better safe than sorry!

We hope this article has been helpful, and you can soon enjoy your Panasonic air conditioner without errors. Good luck, and happy repairing!

Other error codes in Panasonic air-conditioning

Air Conditioner Error Codes for Panasonic

Air Conditioner Error Codes for Panasonic

When your Panasonic air conditioner starts acting up, the first thing you should do is check if it's displaying any error codes on its screen. These codes are a direct ...
Troubleshoot error code "H99" in Panasonic air-conditioning

Troubleshoot error code “H99” in Panasonic air-conditioning

How to eliminate H99 error in Panasonic air conditioning? Error: H99Description: Protection Antifreeze in the Interior UnitCause: Solution: - Refrigerant missing - dirty air filter More tips First, if you ...
Troubleshoot error code "H98" in Panasonic air-conditioning

Troubleshoot error code “H98” in Panasonic air-conditioning

How to eliminate H98 error in Panasonic air conditioning? Error: H98Description: High pressure protection in the interior unit (heating)Cause: Solution: - Dirty air filter - UD air recirculation. inside More ...