Boilers are essential devices that provide heating and hot water for homes and workplaces. However, malfunctions may occur from time to time due to various reasons. Boiler error codes are highly beneficial in identifying the source of the problem and offering quick solutions. In this article, we provide comprehensive information on boiler error codes, common issues, and solutions.
Boilers use an electronic panel to notify users of malfunctions or problems through error codes. These error codes may vary depending on the brand and model of the boiler. However, in general, these codes help both technicians and users easily understand the issue.
Boiler error codes provide crucial information for fault detection and resolution. Users can identify the cause of faults and apply appropriate solution steps using the following list. Here are detailed error codes and solutions for Ecodense WT-S ONE Premix Condensing Boilers
E01 - Failed Ignition
Description: A lockout signal appears when no flame is detected, and ignition attempts stop.
Solution:
E02 - Faulty Flame Formation
Description: Flame formation is detected even though there is no heat demand.
Solution:
E03 - Sensor Overheating Error
Description: High limit temperature protection is triggered in the flow or return temperature sensor.
Solution:
E05 - Fan Feedback Error
Description: This error occurs when the fan driver does not receive a tachometer signal from the fan.
Solution:
E08 - Ignition Circuit Error
Description: The detected flame level is outside the expected limits.
Solution:
E09 - Gas Valve Feedback Fault
Description: The gas valve feedback cannot communicate with the control board.
Solution:
E12 - EEPROM (Software) Fault
Description: EEPROM verification failed, and data is corrupted.
Solution:
E15 - Sensor Temperature Drift Error
Description: The drift sensor validation has failed.
Solution:
E16 - Return Temperature Sensor Lockout Error
Description: During the test, the return temperature sensor locks up.
Solution:
E17 - Flow Temperature Sensor Lockout Error
Description: During the test, the flow temperature sensor locks up.
Solution:
E18 - NTC Sensor Crack Error
Description: The NTC sensor is faulty or cracked.
Solution:
E21 - Electronic Board Fault
Description: The electronic board is not functioning properly; ADC test failed.
Solution:
E33 - Return Temperature Sensor Fault
Description: The return temperature sensor is outside the normal range (short circuit or open circuit).
Solution:
E35 - Flow Temperature Sensor Fault
Description: The flow temperature sensor is outside the normal range (short circuit or open circuit).
Solution:
E03 - High Limit Temperature Fault
Description: Flow or return temperature exceeds 100°C.
Solution:
F13 - Excessive Reset Error
Description: The device triggers an error if it is reset more than 5 times within one hour.
Solution:
F33 - Return Temperature Sensor Fault
Description: The sensor may be faulty or disconnected.
Solution:
F35 - Flow Temperature Sensor Fault
Description: The sensor is outside the normal operating range.
Solution:
F40 - Low Water Pressure Fault
Description: This error appears when the water pressure is low.
Solution:
F47 - High Water Pressure Fault
Description: The water pressure exceeds 3 bar.
Solution:
Description: An error occurs when the flow or return temperature exceeds 100°C.
Solution:
Description: This error occurs if a signal is received from the contactor despite no command being sent.
Solution:
Description: The test between the central heating flow and return temperature sensors fails.
Solution:
Description: This error appears if the device is reset more than 5 times within one hour.
Solution:
Description: This error occurs when the return temperature sensor is not connected or has a short circuit.
Solution:
Description: This error occurs when the flow temperature sensor is not connected or has a short circuit.
Solution:
Description: The error appears when water pressure is low or if there’s a short circuit in the cable.
Solution:
Description: The error occurs when the water pressure exceeds 3 bar.
Solution:
Description: The error occurs when the domestic hot water temperature sensor is not connected or has a short circuit.
Solution:
If the pump is not operated for 24 hours, it automatically runs for 5 seconds to prevent locking.
The three-way valve changes position for 10 seconds if it is not operated for 24 hours to prevent locking.
To activate anti-freeze protection, the following conditions must be met:
Recommendation: Use antifreeze or drain the system to prevent water in the pipes from freezing.
Note: Anti-freeze protection only protects the boiler, not the system pipes.
While error code naming may vary by brand, some common error codes are shared across most boilers:
To minimize boiler faults, apply regular maintenance and checks:
While some error codes can be resolved with simple solutions, others require professional intervention.
Benefits of Technical Service:
Boiler error codes are essential for diagnosing and understanding faults in your system. By interpreting these codes correctly, you can resolve minor issues on your own. However, for complex and technical problems, it is essential to contact a professional service. With regular maintenance and checks, you can minimize boiler faults and enjoy long-term, efficient performance.