Hoymiles Temperature Sensor Error – Meaning, Causes &... | solardiagnostics.org

Technical Background:

The Hoymiles inverter uses a temperature sensor to monitor its internal temperature and ensure safe operating conditions. If the sensor detects temperatures outside the normal operating range, or if it fails to provide accurate readings, the inverter triggers a fault code. This can occur due to issues such as high insulation resistance (RISO) measurements, which indicate potential grounding problems, or if the inverter overheats due to insufficient ventilation. The inverter relies on accurate temperature readings to maintain efficiency and prevent damage, making the temperature sensor a critical component of its operation.

Symptoms:

Homeowners may notice an alert on their monitoring app indicating a temperature sensor error. The inverter's LED may blink in a specific pattern, often signaling a fault. Additionally, there may be a drop in energy production as the inverter may enter a protective mode to prevent damage.

Possible Causes:

Faulty temperature sensor due to environmental exposure or manufacturing defect.
Loose or corroded connections at the temperature sensor terminals.
Inverter overheating due to inadequate ventilation or high ambient temperatures.
Software glitches within the inverter's firmware affecting sensor readings.
Improper system or routing of the temperature sensor wiring, leading to damage or interference.

Solution:

1

Disconnect the inverter from the AC and DC sources using an MC4 disconnect tool.
2

Inspect the temperature sensor and its wiring for any visible damage or corrosion.
3

Use a multimeter to test the resistance of the temperature sensor, comparing it to the manufacturer's specifications.
4

Reconnect any loose terminals and ensure all connections are secure and free from corrosion.
5

If the sensor is faulty, replace it with a compatible unit as specified by Hoymiles.
6

Reconnect the inverter and monitor the system through the app for any recurring alerts.
7

Conduct a thermal inspection of the inverter to ensure proper cooling and ventilation.

Safety Warning:

Always ensure that work on the solar system is performed by a licensed electrician or certified solar installer to prevent electrical hazards.

Prevention:

To prevent future temperature sensor errors, ensure that the inverter is installed in a well-ventilated area away from direct sunlight and extreme weather conditions. Regularly inspect the wiring and connections for signs of wear or corrosion. Keep the inverter’s firmware updated to avoid software-related issues.

Frequently Asked Questions

•What causes a Hoymiles Temperature Sensor Error?

The error can be caused by overheating, faulty sensors, or wiring issues. It's important to check the sensor's connections and the inverter's temperature readings.

•How can I fix the Temperature Sensor Error?

To resolve the error, inspect the temperature sensor for damage and ensure proper installation. If issues persist, consider replacing the sensor or consulting a technician.

Hoymiles Temperature Sensor Error – Meaning, Causes & Solution

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Frequently Asked Questions

•What causes a Hoymiles Temperature Sensor Error?

•How can I fix the Temperature Sensor Error?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention: