Quick answer: A01 on a Vokera boiler means an ignition failure. The boiler tried to light but couldn’t detect a flame, so it locked out. Check your gas supply, make sure the condensate pipe isn’t frozen and reset once. If A01 comes back, a Gas Safe engineer will need to look at the ignition electrode, […]
Vokera A01 Fault Code: Causes and How to Fix It Read More »
Quick answer: When a Vaillant stops working without showing a fault code, the cause is usually outside the boiler: the power supply, the thermostat or timer, low pressure, the gas supply or a frozen condensate pipe. Work through those checks in order. If everything looks fine and it still won’t fire, call a Gas Safe
Vaillant Boiler Not Working but No Fault Code? What to Check Read More »
Quick answer: On older Ideal boilers such as the Isar HE, a D on the display means hot water is on. It’s a status, not a fault, so nothing needs fixing. On some models the reset button is also marked D, which is why you may be told to “press D” to restart the boiler.
Ideal Boiler Status D: What It Means and What to Do Read More »
Quick answer: Baxi E131 is widely reported as a flue overheat lockout. The boiler has detected the flue getting too hot, often after one or more E130 warnings, and has locked itself out. Check the pressure, make sure the flue outside isn’t blocked and reset once. If E131 comes back, call a Gas Safe engineer.
Baxi E131 Error Code: Causes and How to Fix It Read More »
Quick answer: Vaillant F25 means the flue gas temperature is too high, so the boiler has switched itself off for safety. Vaillant lists a faulty wiring harness or a tripped flue gas temperature monitor as the likely causes, and says this one is a job for an expert. Don’t keep resetting it. Call a Gas
Vaillant F25 Error Code: Causes and How to Fix It Read More »
Quick answer: Vaillant F64 means the boiler has found a fault with its electronics, a safety-related sensor or the wiring between them. Very often it’s a flow or return temperature sensor. Reset the boiler once. If F64 comes back, you’ll need a Gas Safe engineer to test the sensors and circuit board. Vaillant boilers are
Vaillant F64 Error Code: Causes and How to Fix It Read More »
Quick answer: Vaillant F70 means the boiler’s electronics don’t recognise which model they’re fitted to. The Device Specific Number (DSN) or coding resistor is missing or incorrect. It nearly always shows up after a circuit board or display has been replaced. A reset won’t clear it, but an engineer can usually set it in a
Vaillant F70 Error Code: Causes and How to Fix It Read More »
Quick answer: F3 on an Ideal boiler is a fan fault, meaning there’s a problem with the part that pushes waste gases out through the flue. Ideal’s own advice is to restart the boiler once. If F3 comes back, leave it switched off and call a Gas Safe engineer, because the boiler won’t run safely
Ideal F3 Fault Code: Causes and How to Fix It Read More »
Quick answer: DEAIR on a Baxi boiler isn’t a fault. It’s an automatic venting cycle that clears air from the boiler and heating system every time the power comes back on. On the Baxi Assure 500 it lasts 6 minutes 20 seconds, then the boiler starts working normally. Leave it alone and let it finish.
Baxi deAir Code: What It Means and How Long It Lasts Read More »
Quick answer: On a Worcester Bosch boiler, FD can mean two different things. The FD number on the data badge is a date code inside the serial number that tells you roughly when the boiler was made. On older badges it’s the 11th, 12th and 13th digits of the long serial number. If FD is
Worcester Bosch FD Code: How to Find Your Boiler’s Age Read More »
