Grant Vortex Pro Combi Fault Codes

CombiOil Oil 21-36 kW 2014-present

GC Numbers: 41-311-7241-311-73

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Most common fault codes

Code	Severity	Plain English	DIY
Demand	High	Your boiler is not currently receiving a signal from your timer or thermostat telling it to switch on.	Yes
DHW pump	High	Your boiler is struggling to manage the temperature of its internal hot water store, meaning you likely have no hot water available.	Engineer
Flow	High	Your boiler is not detecting that a hot tap has been turned on, which is preventing it from heating your water.	Engineer
power	High	Your boiler has lost electrical power and cannot start any heating or hot water functions.	Yes

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