BoilerFaultCodes
The most common Grant faults
Your boiler has lost electrical power and cannot start any heating or hot water functions.
Why it happens: This fault occurs when the boiler is not receiving the electrical current required to operate its internal components. The most common reason is a simple blown 3-amp fuse in the fused spur switch or a tripped circuit breaker in your home's main consumer unit. In more serious cases, it can be caused by a surge that has damaged the boiler's main control board.
Check that the boiler's main power switch is turned to the 'ON' position.Inspect your home's main consumer unit (fuse box) to see if a circuit breaker has tripped.Check the fused spur switch (usually near the boiler) and replace the 3-amp fuse if it has blown.
Your boiler is not detecting that a hot tap has been turned on, which is preventing it from heating your water.
Why it happens: This fault occurs when the boiler fails to detect water moving through the pipes when you turn on a hot tap. The most common reason is that the internal sensor used to trigger the burner has become stuck or damaged, preventing the boiler from knowing there is a demand for hot water. In some cases, a perished rubber diaphragm or a blockage within the unit is stopping the mechanical parts from moving correctly.
Full guide for Vortex Pro Combi 26 FlowYour boiler has stopped working to protect itself and needs to be restarted, though it may take a few attempts to get it running again.
Check your external oil supply tank to ensure you have enough fuel and that any isolation valves are open.Locate the reset button on the boiler casing (or the burner unit) and press it once firmly.Wait for the boiler to attempt an ignition cycle; if it fails again, do not force the reset more than three times.
Your boiler has become too hot and has automatically shut itself down to prevent damage or safety issues.
Allow the boiler to cool down for at least 20 minutes.Locate the overheat reset button under the black screw cap on the control panel.Unscrew the cap and firmly press the small reset button until it clicks.Check that your radiator valves are open and the system pressure is correct.
Your boiler has detected a temporary issue with the burner and has safely shut itself down to prevent any damage.
Check your oil tank to ensure you have enough fuel and that the supply valve is openWait 60 seconds for the internal control unit to resetGently press the illuminated red reset button located on the burner once
Your boiler has stopped working to protect itself and needs a manual reset to try and start up again.
Locate the red reset button on the burner control boxPress and hold the button for 3 seconds, then releaseWait to hear if the burner ignites; if it locks out again, do not force further resets
The water pressure inside your heating system has dropped too low, so the boiler has turned itself off to prevent any damage.
Locate the external filling loop, which is usually a flexible silver hose connecting two valves near your boiler.Open the valves on both ends of the hose to allow water into the system until the pressure gauge needle reaches between 1.0 and 1.5 bar.Close both valves tightly and remove the hose if required by your specific installation.
Your boiler has stopped working because the amount of water inside your heating system has dropped too low.
Locate the external filling loop, which is a flexible silver hose connected to two valves under the boiler.Slowly open both valves to allow mains water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close both valves tightly and ensure the boiler resets itself.
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