Ideal Boiler Fault Codes
FD
No Water FlowProblem
This fault could be caused by the air locks, pump or wiring and usually relates to an issue with installation. It could also be caused by a lack of water in the system or poor water circulation.
Solution
As this isn’t a boiler issue but an installation issue, repressuring the boiler can sometimes help. If not, it’s best to call a professional boiler installer to take a further look.
F1
Low Water PressureProblem
This fault occurs when there’s not enough water in the steam and the pressure becomes low.
Solution
This issue is usually solved by topping up the water pressure using the filling loop.
F2
Flame LossProblem
This usually means the flame has gone out during operation which could be caused by incorrect gas pressure, a flue issue, a gas valve fault, a fan fault or an incorrect adjustment of a valve.
Solution
This is a fault most commonly found with older boilers and systems that are not efficient. You can try resetting the boiler and checking other gas appliances. You may need to invest in a new boiler.
F3
Fan FaultProblem
This is caused by a loose or damaged fan, which may be related to a more complex issue. There may be damaged connections, damage from a boiler leak, air pressure faults or a printer circuit board issue.
Solution
A qualified engineer will be needed to solve this problem, as there are a wide range of causes and solutions.
F4
Thermistor FaultProblem
This shows a problem with the flow thermistor or its operation, and it can lead to issues with circulation.
Solution
A Gas Safe registered engineer will be needed to solve this problem.
F5
Return Thermistor FaultProblem
This signifies a fault with the return thermistor or its operation. It usually relates to a faulty NTC return thermistor, a damaged connection, a differential temperature that’s too high or a faulty printed circuit board.
Solution
A Gas Safe registered engineer will be needed to solve this problem.
F6
Outside Sensor FaultProblem
This shows the outside sensor on the system is broken or faulty and it may relate to the printed circuit board.
Solution
This can be related to a fault with the weather compensator installation, so it’s worth checking. If you don’t have a weather compensator, an engineer will be able to diagnose the problem.
F7
Low Mains VoltageProblem
This could mean an issue with the mains electricity source, if it’s dropped below 190vac, and the boiler will stop working until the fault is resolved.
Solution
This is not a boiler fault, but a boiler installer may be able to help.
F9
Printed Circuit Board (PCD) FaultProblem
This usually relates to an unconfigured printed circuit board.
Solution
Solving this issue can be costly and often a brand new boiler is a better option.
L1
Lack of Water FlowProblem
If the resistant reading temperature is reading too low or too high, the boiler will stop working to ensure safety.
Solution
Resetting the boiler can help, but if not you should contact a qualified engineer. It’s usually older and less efficient boilers than have problems with overheating.
L2
Ignition LockoutProblem
This means the boiler has locked itself as a matter of safety, which can be caused by a variety of things.
Solution
Resetting the boiler may solve the fault. If there’s a rumbling noise coming from the system, the condensate pipe is blocked. There could also be an issue with the flue, both of which require a qualified engineer to fix.
L3
No Flow Thermistor FaultProblem
This means that the printed circuit board has been changed and the wrong boiler chip card has been used.
Solution
A qualified engineer is needed to fix this problem.
L9/H9/HA/LA
OverheatingProblem
This could mean that the temperature on the resistance reading is too high.
Solution
Check the pressure reading on the system and bleed the radiators. If this does not work, contact a Gas Safe engineer as overheating is often a sign of a more complex problem.
LF
Ignition FaultProblem
This means the boiler has locked itself as a matter of safety, which can be caused by a variety of things.
Solution
Check to see if other gas appliances in the property are still working, if they are then reset the boiler. If there’s a rumbling noise coming from the boiler, the condensate pipe could be blocked.
L5
Boiler Return Pipe ProblemProblem
This could be due to someone resetting the boiler five times within a 15 minute period.
Solution
Turn off power to the boiler at the fuse spur, then turn it back on again. Contact a Gas Safe engineer if the problem continues.
L6
Flame Detection FaultProblem
This happens when the flame appears before the gas comes on.
Solution
Reset the boiler. If the problem persists and the system is covered by a warranty, contact the manufacturer.
C2
Boiler Chip Card FaultProblem
The boiler chip card has an internal error.
Solution
Reset the boiler. If this does not solve the problem, contact an engineer.
C0
Central Heating Signal IssueProblem
If the hot water is still working, the boiler could be experiencing a pump overrun due to poor heating circulation.
Solution
Contact a qualified engineer, the thermostat and the radiators will need to be checked.
Other Ideal Logic Boiler Problems
No Display
Problem
There is an issue with the printed circuit board.
Solution
Turn the power off by the fuse spur and turn it back on again. If the problem continues, contact an engineer.
Noisy Boiler
Problem
Kettling is a common issue and a humming/rattling noise could include a number of problems, such as loose components or high pressure.
Solution
Check the central heating system for loose components and try repressurising the boiler. If the problem continues, contact an engineer.
Noisy Ignition
Problem
This could indicate a problem with the condensate pipe, gas or flue.
Solution
Contact a Gas Safe registered engineer.
No Hot Water or Poor Hot Water Supply
Problem
If the heating is working but there’s no hot water, or a lack of hot water, it’s not usually a fault with the boiler.
Solution
Contact a Gas Safe registered engineer.
No Heating or Poor Heating
Problem
If the hot water is working but there’s no heating, or poor healing, it’s usually an issue with the radiators.
Solution
Contact a Gas Safe registered engineer.
High Gas Bill
Problem
This could be due to an inefficient boiler or using the heating incorrectly.
Solution
Check the boiler’s efficiency rating. It may be worthwhile to invest in a new boiler.
Pressure Loss
Problem
This usually means water is escaping somewhere in the system or it could be due to the expansion valve failing.
Solution
Try to repressurise the boiler, but if not contact a Gas Safe registered engineer.
Any questions?
If you are looking for a heating engineer within the Milton Keynes area for anything from boiler installations to fixing a tap, or would like some friendly advice please call Mitch directly today on 01908 034194
Areas we cover
- Aylesbury
- Bedford
- Leighton Buzzard
- Northampton
- Olney
- Towcester
- Woburn Sands
REQUEST AN APPOINTMENT
Use our calendar appointment request form and we will confirm back to you as soon as we can! We look forward to hearing from you.
Request a call back
If you have any questions regarding our services, would like to arrange a quotation or would like to book a call out please contact us using the form below. You can also request an appointment through our contact form. We look forward to hearing from you!