Author name: connor

Quick answer: Vaillant F54 means the boiler isn’t getting enough gas pressure to start up, and it often shows alongside F28 or F29. Check the gas is on at the meter, the gas tap under the boiler is open, your hob works and your prepay meter has credit, then reset once. If your gas supply […]

Quick answer: Baxi E110 means the boiler’s water got too hot, or heated up too quickly, and the overheat safety thermostat shut it down. Poor circulation is usually to blame, such as a sticking pump, trapped air or low pressure. Let the boiler cool, check the pressure, bleed any cold radiators and reset once. If

Quick answer: Vaillant F20 means the boiler’s overheat safety cut-out has tripped because the water got too hot, so it shut off the gas. Low pressure, trapped air and poor circulation are the usual causes, though a faulty temperature sensor can trigger it too. Let the boiler cool, check the pressure and reset once. If

Quick answer: Baxi E125 means water isn’t circulating properly through the boiler. After the burner lit, the temperature either didn’t rise or shot up too fast, so the boiler locked out to protect itself. Low pressure and trapped air are common causes you can check yourself. A failing pump or a build-up of sludge needs

Quick answer: On most Vaillant boilers, F61 means the control board can’t operate the gas valve, because of a fault in the valve, its wiring or the circuit board. On the newest ecoTEC plus models, F61 means an internal control board timing fault instead. Either way it’s engineer work. Try one reset, then call a

Quick answer: A boiler error code tells you why your boiler has stopped. Most codes fall into four groups: low water pressure, ignition or flame failure, overheating, and circulation or sensor faults. Low pressure is often something you can fix at home. Almost everything else needs a Gas Safe engineer. A code flashing on the

Quick answer: Vaillant F72 means the boiler’s two water temperature sensors, on the flow and return pipes, are giving readings that don’t make sense together. It’s usually a faulty sensor or a wiring problem, and now and again poor circulation. Check your pressure and try one reset. If F72 keeps coming back, a Gas Safe

Quick answer: Baxi E133 means the boiler tried to light but couldn’t detect a flame, so it locked out. The most common causes are a break in the gas supply, such as a prepayment meter running out of credit, and, in winter, a frozen condensate pipe. Check your gas and the condensate pipe, then reset

Quick answer: Vaillant F27 means the boiler has picked up a flame signal while the burner should be off. Vaillant calls this “flame simulation”, and the boiler locks out for safety. A gas valve that isn’t sealing properly, a fault in the flame-sensing electronics or moisture on the circuit board are the usual causes. You

Quick answer: Vaillant F83 means the burner lit but the boiler didn’t detect the water warming up, so it shut itself down. Low water pressure, air trapped in the system or poor circulation cause most F83 faults. Topping up the pressure and one reset often clears it. If it keeps coming back, you need a