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
Demand DHW pump Flow
Your boiler is not currently receiving a signal from your timer or thermostat telling it to switch on.
May be DIY safe · £0-120
Your boiler is struggling to manage the temperature of its internal hot water store, meaning you likely have no hot water available.
Gas Safe engineer required · £180-£450
Your boiler is not detecting that a hot tap has been turned on, which is preventing it from heating your water.
Gas Safe engineer required · £120-220
All 4 fault codes
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