Common Boiler Error Codes
Here at A-M Plumbing, we deal with a wide range of boilers on a daily basis. We specialise in the repair and installation of Vaillant Boilers, Worcester Bosche and Ideal boilers. You can find a list of common boiler error codes below. If you cannot find your error code or do not know how to resolve your issue, call a member of our friendly team.
Vaillant Error Codes
F.22: This code indicates low water pressure in your system. You may need to check for leaks or top up the pressure.
F.XX (where XX is a number between 00 and 15): These codes typically point to NTC (Negative Temperature Coefficient) thermistor faults. NTC thermistors are sensors that monitor the temperature of the water in your boiler. A fault with one of these could mean it’s malfunctioning or not properly connected.
F.60 or F.61: These codes indicate a problem with the gas valve control. This could be a faulty cable connection, a defective gas valve or an issue with the electronic control system.
F.21: This code means the pilot flame has failed to ignite. There could be an ignition system problem or a gas supply issue.
Worcester Bosche Error Codes
You can view Worcester Bosche Error Codes here https://www.worcester-bosch.co.uk/support/troubleshooting/faqs/all-faqs/what-do-the-error-symbols-mean-on-my-boiler
Ideal Boiler Error Codes
Here is a list of common boiler Error codes. If you cannot find what you are looking for, Contact Us
L Codes (Flashing Light):
- L1: Flow temperature overheat or no water flow lockout. This could be due to blocked radiators, low water pressure, or a faulty pump.
- L2: Ignition lockout. This means the boiler struggled to ignite. It could be caused by low gas pressure, a faulty gas valve, or a problem with the flue.
- L5: Return thermistor fault. The thermistor that measures the return water temperature is malfunctioning.
- L6: False flame lockout. The boiler detected a flame when there wasn’t one, which could be a safety feature malfunction.
F Codes (Flashing Letter):
- F2, FN, LN: Flame loss or ignition lockout. Similar to L2, this indicates the boiler couldn’t ignite or maintain a flame.
- F3: Fan fault. The fan that expels fumes isn’t working properly.
- F4, L4: Flow thermistor fault. The thermistor that measures the flow water temperature is malfunctioning.
- F5: Return thermistor fault. Same as L5.
- F6: Outside sensor fault. The sensor that measures the outdoor temperature is malfunctioning.
- F7: Low mains voltage. The electrical supply to the boiler is too low.
C Codes (Flashing Letter):
- C2: BCC Chip fault. The BCC chip, which controls boiler functions, is malfunctioning.