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What does a blue light on a boiler mean?
Should I be worried about this, or is it something that can wait? I have a normal guy who deals with my boiler but can't ring him to ask
Expert Trade Answers
"Steady blue light means boiler got power, flashing blue means boiler got fault"
Answered on 9th Dec 2025 - Member since Aug 2024 -
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"Hi Jackie,
A blue light on most modern boilers usually indicates that the boiler is operating normally and the flame is lit. However, if the light is flashing, changing colour, or the boiler is not heating properly, then it could be signalling an issue such as:
• Flame detection problem
• Low pressure
• Ignition fault
• Sensor issue
If the boiler is working fine otherwise, it’s not an emergency, but it’s still a good idea to have it checked when your engineer is available—just to ensure everything is running safely and efficiently."
A blue light on most modern boilers usually indicates that the boiler is operating normally and the flame is lit. However, if the light is flashing, changing colour, or the boiler is not heating properly, then it could be signalling an issue such as:
• Flame detection problem
• Low pressure
• Ignition fault
• Sensor issue
If the boiler is working fine otherwise, it’s not an emergency, but it’s still a good idea to have it checked when your engineer is available—just to ensure everything is running safely and efficiently."
Answered on 9th Dec 2025 - Member since Apr 2025 -
report
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