Mitsubishi Electric Mini Split Error Code P1: How to Fix It

Q: What causes a Mitsubishi mini split P1 error code?

The P1 error is caused by a faulty intake air thermistor sensor that has developed an open or short circuit. This can happen due to age, moisture exposure, physical damage, or loose wiring connections.

Q: Can I continue using my mini split with a P1 error?

No, you should not continue operating the system with a P1 error. The faulty thermistor prevents proper temperature sensing, which can lead to inefficient operation, potential system damage, or safety issues.

Q: How much does it cost to fix a Mitsubishi P1 error?

If you replace the thermistor yourself, the part typically costs $15-40. Professional repair usually ranges from $150-300 including the service call, diagnosis, and parts replacement.

Q: How long does a mini split thermistor typically last?

Mini split thermistors usually last 8-15 years with proper maintenance. Factors like humidity, dust buildup, and electrical surges can affect their lifespan.

Q: Will cleaning the thermistor fix the P1 error?

Cleaning can fix the issue if the problem is caused by dirty connections or debris on the sensor. However, if the thermistor has an internal open or short circuit, it will need to be replaced.

Abstract

The P1 error code on your Mitsubishi Electric mini split indicates a problem with the indoor unit's intake air thermistor sensor. This sensor monitors air temperature but has developed an open circuit or short circuit, preventing proper temperature readings and system operation.