Ideal Logic Boiler Fault Guide

Ideal Logic Boiler Fault Guide

Ideal Logic Boiler Faults: Understanding and Solutions

Ideal Logic Boiler Faults: Understanding and Solutions

Ideal Logic boilers are renowned for their reliability and efficiency. However, like any mechanical system, they can encounter faults. This blog post delves into common faults in Ideal Logic boilers and provides practical solutions to address them. We reference information from HomeServe, Maintracts Services Ltd, and 24|7 Home Rescue to offer a comprehensive guide.

Common Fault Codes and Their Meanings

F1 - Low Water Pressure: This indicates that the boiler’s water pressure is too low. The solution involves checking and refilling the boiler pressure, ensuring it is at 1.5 bars, and repairing any leaks.

F2 - Flame Loss: This fault suggests a problem with the gas supply. Ensure the boiler’s gas valve is open and the pilot light is functioning. If the issue persists, seek assistance from a qualified technician.

F3 - Fan Fault: A malfunctioning fan can trigger this error. The fan should be checked for proper operation, cleaned, or replaced if faulty. Persistent problems necessitate contacting a Gas Safe Engineer.

L1 - Flow Temperature Overheat or No Water Flow: This fault is typically due to an overheated flow temperature or blocked water flow. Inspect the flow of water, adjust the flow temperature by resetting the boiler, and seek professional help if the problem continues.

L2 - Ignition Lockout: This occurs when there’s an issue with the gas supply or the pilot light. Check these components and consult a Gas Safe Engineer if the problem doesn’t resolve.

C - Boiler in Hot Water Mode or Reached Desired Temperature: When your boiler is either operating in hot water mode or has reached the set temperature for central heating, this code will appear. Ensure the thermostat and hot water settings are correct.

Additional Codes

0: Indicates the boiler is in standby mode, waiting for a heating or hot water demand. This is normal and requires no action.

F4, F5, F6: These codes relate to various sensor faults like flow thermistor, return thermistor, and outside sensor failure, respectively. These typically require professional attention.

F7: Suggests low mains voltage. Check the mains voltage, and if it drops below 190 VAC, contact a professional.

F9: Indicates an unconfigured printed circuit board (PCB), often suggesting the need for a new boiler or professional repair.

Preventive Measures and Regular Maintenance

To prevent faults and ensure the longevity of your Ideal Logic boiler, regular maintenance is crucial. This includes annual servicing by a certified technician, regular checks of pressure levels, and ensuring that the system is free from leaks or blockages. Prompt attention to any unusual signs or fault codes can prevent more significant issues and prolong the life of your boiler.


Understanding the fault codes of your Ideal Logic boiler and knowing how to respond can significantly enhance your boiler’s efficiency and longevity. While some issues can be resolved through simple checks and resets, others may require professional intervention. Always prioritize safety and efficiency by seeking expert advice when needed.

Fault Codes Table

Fault Code Description Solution
F1 Low Water Pressure Check and refill the boiler to 1.5 bars; repair any leaks.
F2 Flame Loss Check the gas supply and pilot light; ensure gas valve is open.
F3 Fan Fault Check fan operation; clean or replace if necessary.
L1 Flow Temperature Overheat or No Water Flow Inspect water flow, adjust flow temperature, reset boiler.
L2 Ignition Lockout Check gas supply and pilot light; consult a Gas Safe Engineer if unresolved.
C Boiler in Hot Water Mode or Reached Desired Temperature Check thermostat and hot water settings.
0 Standby Mode No action needed; normal behavior.
F4 Flow Thermistor Fault Contact a Gas Safe Engineer for inspection and repair.
F5 Return Thermistor Fault Contact a certified professional for diagnosis and repair.
F6 Outside Sensor Failure Check sensor and wiring; replace if faulty.
F7 Low Mains Voltage Check mains voltage; contact a professional if below 190 VAC.
F9 Unconfigured PCB Consider a new boiler or professional PCB repair.
L5 5 Boiler Resets in 15 Minutes Investigate causes of frequent resets; consult a technician.
L6 False Flame Lockout Reset the boiler, check flame detection mechanism.
C0 Boiler Chip Card (BCC) Activation Fault Reset the boiler; if persistent, contact a technician.
C2 Boiler Chip Card (BCC) Fault Contact a technician for chip card inspection and replacement.
D Call for Hot Water but Boiler at Desired Temperature Check hot water temperature settings; consult a technician if unresolved.
Back to blog