Troubleshooting and fixing fault code 702 “Zone 2 send sensor defective”
on your Ariston E-Combi One Boiler
The Ariston E-Combi One boiler is known for its efficiency and reliability, but like any sophisticated appliance, it may encounter occasional faults. One common issue user may face is the “702 Zone 2 Send Sensor Defective” error. Understanding this fault, recognizing red flags, and learning how to troubleshoot it can assist homeowners and engineers in promptly addressing the problem. In this blog, we’ll delve into the details of the 702 error, explore warning signs to watch out for, provide troubleshooting tips for homeowners, and discuss actions an engineer can take to resolve the issue.
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Understanding the Fault 702 Error:
The “702 Zone 2 Send Sensor Defective” error on the Ariston E-Combi One boiler indicates a potential problem with the Zone 2 send sensor. The send sensor is a critical component responsible for measuring and sending temperature data from Zone 2 (an additional heating zone) to the boiler’s control system. When this error occurs, it typically signifies that the send sensor in Zone 2 is either malfunctioning or not providing accurate data, leading to issues with heating zone control.
Red Flags!
Error Code Display: The primary indicator of the 702 error is the display of the specific error code on the boiler’s control panel.
Zone 2 Heating Issues: Zone 2 may experience insufficient or no heating, resulting in discomfort in the affected area.
Fluctuating Temperatures: The heating system may experience inconsistent temperatures in Zone 2 due to inaccurate temperature readings from the send sensor.
Boiler Lockouts: Frequent boiler lockouts and repeated triggering of the 702 error indicate that the issue requires immediate attention.
Differential Heating: There might be a noticeable difference in temperatures between Zone 2 and other heating zones in the home.
Check out what your allowed to do:
Homeowners – What you can do as a homeowner?
Qualified Gas Engineers – Troubleshooting Tips, And What to Do as a Qualified Gas Engineer?
Troubleshooting Tips:
Before seeking assistance from an engineer, homeowners can attempt some preliminary troubleshooting steps to address the 702 error:
- Power Cycle: Turn off the boiler using the power switch and unplug it from the power source. Wait for a few minutes before plugging it back in and restarting the boiler. This simple power cycle may clear minor glitches.
- Check Wiring Connections: Inspect the wiring connections between the Zone 2 send sensor and the boiler’s control unit. Ensure all connections are secure and undamaged.
- Inspect the Sensor: Visually inspect the Zone 2 send sensor for any visible damage or signs of wear. Clean the sensor if necessary.
- Swap Sensors: If possible, swap the Zone 2 send sensor with another functional sensor to determine if the issue lies with the sensor itself.
- Reset Boiler Parameters: After completing the checks, reset the boiler to its factory settings to see if the error persists.
What can you do as a Homeowner?
Apart from troubleshooting, homeowners can adopt proactive measures to prevent the 702 error and maintain optimal boiler performance:
- Regular Maintenance: Schedule annual servicing by a qualified engineer to keep the boiler in excellent condition and identify potential issues early.
- Monitor Zone Temperatures: Regularly check and compare temperatures in Zone 2 and other heating zones to detect any discrepancies.
- Educate Household Members: Inform everyone in the household about the importance of proper heating zone usage and care.
- Keep Heating Zones Clear: Ensure that heating zones are not obstructed by furniture or objects, allowing for efficient heat distribution.
- Zone Valve Maintenance: If your system has zone valves, have them inspected regularly to ensure proper functionality.
What to do as a Qualified Gas Engineer?
If the 702 error persists or if homeowners are unable to troubleshoot the issue, it’s time to call a qualified engineer. Here’s what an engineer might do:
- Inspect Send Sensor: The engineer will thoroughly inspect the Zone 2 send sensor for faults and test its accuracy.
- Check Wiring and Connections: All wiring and connections related to the send sensor will be examined to ensure they are secure and functioning correctly.
- Sensor Replacement: If the send sensor is defective, the engineer will replace it with a new, compatible sensor.
- Calibrate System: After replacing the sensor, the engineer will calibrate the system to ensure accurate temperature readings.
- Check Heating Zone Valves: If applicable, the engineer will inspect and maintain the zone valves for proper operation.
How To Fix the Fault Code 702 on an Ariston E-Combi One Boiler
FAQ's
The 702 error is not inherently dangerous but indicates an underlying issue that requires attention. It may lead to inefficient heating and discomfort in the affected zone.
Replacing the send sensor is a complex task that should only be performed by a qualified engineer. DIY attempts may lead to further complications.
The send sensor can become defective due to wear and tear, electrical issues, or exposure to harsh environmental conditions.
Annual servicing is recommended to ensure the boiler operates efficiently and safely. Regular maintenance can prevent issues like the 702 error from occurring.
Continued operation with a defective send sensor can lead to inefficient heating and potential damage to the system. It’s best to turn off the boiler and seek professional help.
Conclusion
The 702 “Zone 2 Send Sensor Defective” error on the Ariston E-Combi One boiler requires immediate attention to ensure efficient heating and optimal boiler performance. Homeowners can attempt basic troubleshooting, but a qualified engineer should be called upon if the error persists. Regular maintenance, proper care, and awareness of boiler safety protocols can help prevent such errors and extend the lifespan of the heating system. By understanding the fault and taking appropriate actions, homeowners can enjoy consistent and comfortable heating throughout their homes.
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More help & advice:
Take a look at more error/ fault codes for the Ariston E-Combi One Boiler.
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