P7
Electrolux Split AC
Severity: ModerateWhat Does This Error Mean?
P7 means one of the temperature sensors in the AC system has an open or short circuit fault. Sensors monitor air and pipe temperatures to control the system safely — a failed sensor stops operation. A technician is usually needed to identify which sensor has failed and replace it.
Affected Models
- Electrolux EXH09HL1W
- Electrolux EXH12HL1W
- Electrolux ESV09CRK
- Electrolux EWHI09
- Electrolux Inverter Split System
Common Causes
- Indoor ambient temperature sensor has an open or short circuit
- Indoor evaporator pipe temperature sensor has failed
- Outdoor ambient temperature sensor is damaged or disconnected
- Outdoor condenser pipe sensor has developed a fault
- Sensor connector pulled loose from the PCB due to vibration over time
How to Fix It
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Turn off the AC at the remote and switch off the circuit breaker.
Allow the system to power down fully before inspecting any components.
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Remove the indoor unit front cover and locate the temperature sensor — a small probe attached to the coil or clipped near the air inlet.
The sensor looks like a small thermistor bulb on a thin wire. Check that the wire is not kinked or broken.
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Gently check that the sensor connector is firmly plugged into the indoor PCB.
A loose connector is an easy fix — push it in firmly and try restarting.
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Restore power and restart the AC to see if P7 clears.
If a connector was loose, P7 should disappear and the AC should operate normally.
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If P7 persists, call a licensed technician to test sensor resistance with a multimeter.
Each sensor has a specific resistance range — a reading outside that range confirms the faulty sensor.
When to Call a Professional
Call a technician to diagnose P7 — there are multiple sensors and only a technician with a multimeter can test resistance values. Sensor replacement is low-cost and straightforward once the faulty sensor is identified. Do not run the AC with a faulty sensor — the system cannot regulate temperature safely.
Frequently Asked Questions
How do I know which sensor caused P7?
P7 does not specify which sensor has failed — it only indicates a sensor circuit fault. A technician uses a multimeter to test the resistance of each sensor individually. Once the faulty sensor is found, it is inexpensive to replace (usually $20–$60 for the part).
Can a temperature sensor fail suddenly or does it degrade over time?
Sensors can fail both ways — sudden wire breakage or gradual resistance drift. Exposure to moisture, vibration, and temperature extremes causes sensors to degrade over time. A sensor that fails intermittently (P7 comes and goes) is close to full failure.
Is it safe to run the AC with P7 showing?
No — the AC will not operate correctly without accurate temperature sensor data. Without proper sensor feedback, the system cannot regulate cooling or heating safely. Leave it off until the faulty sensor is replaced.