Warm Air Boiler Error Codes: A Homeowner’s Guide for Johnson and Starley

If you're a homeowner in London with a Johnson and Starley warm air boiler, you can rest assured that even with their advanced safety features, boilers can sometimes experience problems. We understand how frustrating it can be when your boiler throws an error code, but these safety features are designed to protect you and your home.

Let's talk about what error codes mean, possible causes, how to prevent them, and why it's important to call a professional for a reliable boiler repair.

Regular maintenance is key to understanding how to manage your warm air boiler and keep your home warm efficiently. It can help prevent issues and ensure the efficient operation of your boiler.

Johnson and Starley Boiler Error Codes

Understanding warm air boiler error codes is crucial as they are indicators that help to alert your boiler to a problem. These codes can indicate specific issues within the boiler system.

Some errors can be due to minor faults, while others require immediate attention from a professional. This knowledge empowers homeowners to manage their warm air boilers effectively.

Common Johnson and Starley Error Codes and Their Causes

1) Error Code 1 – Flame Lockout

Cause: Flame not detected
Action: Check gas supply, gas valve operation, and ignition electrode. Ensure the gas reaches the burner and that the spark is functioning correctly.

When you encounter Error Code 1 on your Johnson and Starley boiler, it indicates a flame lockout after multiple attempts to ignite. This frustrating situation happens when the boiler can't detect a flame, which interrupts the heating process.

In such situations, first, check if the gas supply or gas cock is closed, as this would prevent fuel from reaching the burner.

If your burner does manage to ignite but the error code lingers, it's time to inspect the flame sensor or the wiring connected to the control board. The issue might even stem from a malfunctioning gas valve.

Always get support from a professional warm air heating service that can ensure your home's safety.

2) Error Code 2 – False Flame Lockout

Cause: Incorrect flame detection.
Action: Inspect the wiring on the ESYS control board for loose connections or damage.

False Flame Lockout on a Johnson and Starley boiler arises when the system mistakenly senses a flame, preventing the boiler from igniting properly. Typically, this points to an electrical fault, particularly involving the ESYS control board wiring.

To address this problem, a thorough inspection of the ESYS wiring is necessary to identify any loose connections, corrosion, or shorts.

3) Error Code 3 – Condensate Pump Failure

Cause: Power interruption to the pump.
Action: Check for blockages in the condensate drain and verify the power supply to the pump.

The condensate pump of a boiler is responsible for removing condensation. However, this issue often stems from an interruption in power, potentially caused by electrical faults, a tripped fuse, or loose wiring.

So, it's important to check the pump for any visible blockages and ensure it receives power.

If the issues persist, we advise you to contact a professional Gas Safe engineer near you so you can prevent complications, such as water backup, that could damage the system.

4) Error Code 5 – No Tacho from Fan

Cause: Fan malfunction or wiring issue.
Action: Ensure the combustion fan is running and check the wiring between the fan and ESYS.

This error code points to a problem with the combustion fan. It typically arises when the fan fails to operate or a wiring issue disrupts communication between the fan and the ESYS control board. Since the fan is crucial for maintaining proper airflow and combustion, any malfunction can hinder the performance of your heating system.

To start fixing the issue, check if the fan is running. If it works, the problem may lie with the ESYS control board or its wiring. However, if the fan doesn't function, it likely requires repair or replacement.

Additionally, inspect the wiring connections between the fan and the ESYS to ensure they are secure.

5) Error Code 7 – Flue Gas Protection

Cause: High flue gas temperature.
Action: Inspect air flow, check for blockages, and ensure the fan operates correctly.

This error code indicates that the boiler's flue gases are getting too hot, exceeding the safe limits. To protect itself from overheating, the boiler shuts down. This usually happens when there's a problem with airflow. If the vents or airways are blocked, or the fan isn't working right, the gases can't escape properly. This causes them to build up and get hotter.

To fix this, make sure all the vents and airways are clear and check that the fan is working.

6) Error Code 8 – Flame Circuit Error

Cause: Flame sensing lead shorted to earth.
Action: Examine the flame detection lead for wear or disconnection.

When encountering Error Code 8, a flame circuit error it usually stems from the flame sensing lead being shorted to earth. This issue disrupts the transmission of the electrical signal from the flame sensor to the ignition control board. This issue commonly occurs because the wiring is damaged or not placed correctly.

To solve this problem, an engineer needs to check the flame detection wire for any wear, disconnection, or short circuits. They should make sure the wiring between the sensor and the ignition control board is secure and in good condition.

7) Error Code 9 – Valve Driver Circuit Error

Cause: Gas valve not detected.
Action: Check the flame detection lead for secure connections.

Valve Driver Circuit or Error code 9 signals a problem with the gas valve detection in your warm air boiler, potentially disrupting your home's heating. This issue typically arises from faulty connections or malfunctioning boiler components.

It's important to check the flame detection lead. This wire connects the sensor to the ignition control board. Make sure it's tight and not damaged. If it is correctly fixed, the gas valve might work correctly again. This will help your boiler run properly.

8) Error Code 13 – Remote Reset Lockout

Cause: More than five remote resets within an hour.
Action: Reset the boiler by turning the power off and on

This error code means the boiler has been reset more than five times within an hour. It's a safety feature to prevent damage.

To fix it, just turn off the boiler and then turn it back on.

9) Error Code 21 – ADC Error

Cause: Fault in the Analog to Digital Converter.
Action: Replace the ESYS module.

If you've encountered error code 21 on your boiler, it means there's a problem with the Analog Digital Converter (ADC). This component is crucial for accurately measuring temperature and ensuring your boiler operates efficiently.

When the ADC malfunctions, your boiler may struggle to receive or process data from its sensors. This can lead to heating problems. To resolve this issue, the best solution is to replace the Electronic System (ESYS). The ESYS controls many important boiler functions, and replacing it will not only fix the ADC error but also improve your boiler's overall performance and safety.

If you see error code 21, don't try to fix it yourself. Contact a Gas Safe registered engineer for a proper diagnosis and repair. They can assess your boiler and determine if replacing the ESYS is the best course of action.

10) Error Code 25 – CRC Error

Cause: Mismatched software versions.
Action: Change the ESYS module for compatibility.

CRC Error on Johnson and Starley warm air boilers signals a communication problem arising from incompatible software versions between the boiler's control board and the ESYS module. This error can cause your heating system to malfunction.

To fix it, you need to replace the ESYS module. This will make sure it works properly with your boiler's software.

11) Error Code 26 – Flame Lost Signal (5 times in 4 minutes)

Cause: Flame sensing error or gas pressure issues.
Action: Check the flame sensor, gas supply, and heat exchanger.

This issue may arise from a faulty flame sensor, fluctuating gas pressure, or blockages in the system. When the burner ignites, a drop in gas supply pressure or a compromised heat exchanger can contribute to this error.

To address the issue, start by inspecting the flame detection lead for any damage and ensuring all connections are secure. It's also important to verify that the gas supply remains stable during operation.

Additionally, checking the heat exchanger and fan for any blockages or dirt build-up is crucial, as this can restrict airflow.

12) Error Code 30 – Duct Air Temperature

Cause: Shorted sensor or failure.
Action: Inspect wiring for shorts and check sensor resistance.

This signals a malfunction with the duct air temperature sensor, which might be shorted to earth or completely failed. This malfunction can result in inaccurate temperature readings, negatively impacting the boiler's efficiency and heating capabilities.

So, it's important to inspect the wiring and connections for any signs of a short circuit and check the sensor's resistance. Ensuring the sensor operates correctly is vital for maintaining your home's comfort and optimal performance.

13) Error Code 31 – Duct Air Temperature Sensor Open Circuit

Cause: The sensor was not connected or failed.
Action: Verify wiring connections and check sensor continuity.

This error signifies that the temperature sensor monitoring the duct air is either disconnected or malfunctioning, preventing the system from accurately measuring the air temperature. Consequently, this can impact the boiler's efficiency and overall performance.

To resolve the issue, it is crucial to inspect the wiring connections for security and damage, as well as to test the sensor's continuity.

Check out here for the engineer's guide to troubleshooting error codes on Johnson and Starley warm air boilers.

14) Error Code 34 – Low Mains Supply Voltage

Cause: Electrical supply fault or faulty appliance wiring.
Action: Check the incoming mains supply and appliance wiring.

Error Code 34 on a Johnson and Starley warm air boiler signals a low mains supply voltage, potentially disrupting its operation. This problem can stem from an electrical supply fault in the property or faulty wiring linked to the boiler. Homeowners are encouraged to start by checking the incoming mains supply for adequate voltage.

It's also important to inspect the wiring leading to the boiler, as any faulty connections can result in performance issues or system failures. By addressing these electrical concerns promptly, homeowners can ensure their boilers operate efficiently and reliably, maintaining a warm and comfortable home.

Check out our blog for everything you need to know about warm air boilers!

15) Error Code 43 – Return Air Temperature Short Circuit

Cause: Temperature sensor shorted to earth.
Action: Inspect wiring connections and check sensor resistance.

Error Code 43 points to a return air temperature short circuit, usually caused by the sensor being shorted to earth. This disrupts the boiler's ability to measure air temperature accurately, which can affect heating efficiency.

To fix the issue, start by checking the wiring connections for any shorts to earth and ensure everything is properly connected. It's also important to test the sensor's resistance to make sure it's working correctly.

16) Error Code 44 – Return Air Temperature Sensor Open Circuit

Cause: The sensor was not connected or failed.
Action: Ensure wiring connections are secure and check sensor continuity.

This means the return air temperature sensor has an open circuit. This could happen if the sensor isn't properly connected or has stopped working.

Start by checking the wiring to make sure everything is secure. If the connections look fine, test the sensor for continuity to see if it's working.

17) Error Code 45 - Flue gas temperature sensor short circuit

Cause: Short circuit in wiring between sensor and control board
Action: Check the wiring to the sensor, Check the electrical resistance of the sensor

Error Code 45 on warm air boilers points to a flue gas temperature sensor short circuit. This happens when the wiring between the sensor and control board is damaged or improperly connected, affecting the boiler's ability to monitor flue gas temperatures.

Resolving the issue involves inspecting the wiring for faults and checking the sensor's electrical resistance, as the sensor itself could also be faulty.

18) Error Code 46 - Flue gas temperature sensor open circuit

Cause: Temperature sensor not connected or failed
Action: Check wiring connections, Check sensor continuity

This signifies an open circuit in the flue gas temperature sensor, indicating that the sensor might be disconnected or malfunctioning. This error can severely impact the boiler's efficiency and safety.

To resolve this, begin by examining the wiring connections to ensure they are secure and undamaged. If everything looks good, test the sensor's continuity to check its functionality. Should the sensor fail to show continuity, a boiler replacement will be necessary to restore the boiler's proper operation.

19) Error Code 57 – Restricted airflow

Cause: Blocked filters or return air ducts.
Action: Check and clean filters and ducts to restore proper airflow.

This means the airflow is restricted, which can affect heating performance. This usually happens because blocked filters or air ducts limit air circulation. When airflow is poor, the boiler may have trouble maintaining the right temperature, use more energy, and risk overheating.

To fix the problem, clean the filters and ducts thoroughly.

20) Error Code 99 - Communication MMI-ESYS lost

Cause: Connection between MMI & ESYS incorrectly made
Action: Check wiring and connections, Check limit switch continuity.

Error Code 99 on the Johnson and Starley warm air boiler means the system has lost communication between the MMI (Man Machine Interface) and the ESYS (Electronic System), which can interrupt the boiler's operation. This usually happens due to incorrect or loose connections between these components.

To fix it, you'll need to inspect the wiring and ensure everything is properly connected. Checking the continuity of the limit switch can also help identify any hidden faults.

These error codes are just a few examples. Every error code gives a clue about what might be wrong, from wiring issues to airflow problems or sensor failures.

How to Prevent Boiler Error Codes?

Prevention is key to avoiding error codes. Here are some simple tips to maintain your boiler and avoid unexpected breakdowns:

Get your boiler serviced annually by a professional. This ensures that all components are checked and cleaned, reducing the chance of issues developing.

Blocked filters are a common cause of restricted airflow and overheating. Regularly cleaning or replacing filters will help your boiler run efficiently.

Make sure air vents are not blocked. Clear any obstructions near your boiler to ensure proper air circulation.

Ensure your thermostat and timer are set correctly to avoid unnecessary strain on the boiler.

Why You Should Call a Gas-Safe Engineer?

When your boiler shows an error code, it's essential to call a qualified Gas-Safe engineer. Attempting to fix a boiler yourself can be dangerous, especially when dealing with gas or electrical issues.

A Gas Safe engineer has the expertise to safely and effectively repair your boiler, preventing potential hazards like emergency gas leaks or electrical faults.

Additionally, professional engineers can properly diagnose the root cause of the error code, ensuring that the issue is fully resolved rather than a temporary fix. They will also ensure that your boiler complies with all safety regulations, giving you peace of mind.

How to Maintain Your Boiler?

Regular maintenance is crucial to keep your Johnson and Starley boiler running smoothly. Here are a few basic tips:

Book an annual boiler service with a gas-safe engineer. They will inspect, clean, and test your boiler, ensuring all parts are in good working order.

Check and clean the air filters regularly to prevent blockages that can cause error codes like "restricted airflow" (Error Code 57).

Ensure there is no obstruction in air vents and ducts. Proper ventilation is key to your boiler's performance.

Monitor your system for any signs of water leaks or unusual noises. Addressing these early can prevent more serious issues.

By following these tips and calling a professional when needed, you can ensure your warm air boiler runs efficiently, avoiding breakdowns and keeping your home comfortable year-round.

Call Serviceteam Heating Engineers for Reliable Repairs in London

When you face any error codes or issues with your Johnson and Starley boiler, don't hesitate to call Serviceteam heating engineers in London.

Our team of qualified Gas Safe engineers has extensive experience with warm air systems. If you're interested in learning more about warm air heating systems, check out our blogs. Whether it's a minor fault or a major repair, we ensure reliable, professional service to keep your home warm and your boiler running efficiently.

If your boiler is showing error codes or you just want regular service to prevent problems before they occur, contact us today for peace of mind and expert service.

Check out our boiler error code section for more knowledge on boiler error codes.