Grant Engineering is an Irish manufacturer of oil-fired boilers, founded in 1979. Their Vortex range of condensing oil boilers is extremely popular in rural UK and Ireland where mains gas is unavailable. Grant boilers are oil-fired (kerosene), not gas, so all fault diagnosis and repair must be carried out by an OFTEC registered engineer.
Grant Boiler Fault Codes
All Grant Fault Codes 23
| Code | Fault | Severity | Type | View guide |
|---|---|---|---|---|
| BURNER LOCKOUT | Burner Lockout The oil burner has gone to lockout — the red lockout light on the burner… | High | DIY Check | View Guide |
| E01 | Internal Control Fault The boiler's internal control electronics have detected a fault. | High | Engineer | View Guide |
| E02 | Flame Failure Flame lost during operation. | High | Engineer | View Guide |
| E03 | Fan Fault Fan not running correctly. | High | Engineer | View Guide |
| E04 | PCB Fault Internal PCB error. | High | Engineer | View Guide |
| E05 | Condensate Blocked Condensate blocked or frozen. | Medium | DIY Check | View Guide |
| E06 | Air Pressure Switch APS not confirming airflow. | High | Engineer | View Guide |
| E07 | Flue Gas Overheat Flue gas too hot. | High | Engineer | View Guide |
| E08 | DHW Sensor Fault Hot water sensor faulty. | Medium | Engineer | View Guide |
| E09 | Diverter Valve Fault Valve stuck. | Medium | Engineer | View Guide |
| E10 | Combustion Fault Combustion outside limits. | High | Engineer | View Guide |
| EE1 | High Pressure / Pump Failure / Airlock On Grant heat pump models, EE1 indicates high pressure caused by circulating pump failure or… | High | Engineer | View Guide |
| EE2 | Low Pressure The system water pressure is too low on Grant boilers. | Low | DIY Check | View Guide |
| EE3 | Overheat Protection Safety thermostat activated. | High | Engineer | View Guide |
| EE4 | Flow Sensor Fault Flow NTC sensor faulty. | Medium | Engineer | View Guide |
| EE5 | Return Sensor Fault Return NTC sensor faulty. | Medium | Engineer | View Guide |
| NO FUEL | No Oil Supply / Empty Tank The burner cannot obtain an adequate supply of oil fuel. The tank may be empty,… | High | DIY Check | View Guide |
| OVERHEAT | Overheat Thermostat Activated The boiler's overheat safety thermostat has tripped. On Grant oil boilers this usually means the… | High | Engineer | View Guide |
| PP1 | Flow/Return Temperature Sensor Fault The inlet (return) water temperature sensor has failed on Grant heat pump models. | Medium | Engineer | View Guide |
| PP2 | Pump Fault Pump not running. | High | Engineer | View Guide |
| PP3 | Low Water Pressure System pressure too low. | Low | DIY Check | View Guide |
| RED LIGHT STEADY | UV Sensor / Gas Valve Fault (Vortex Blue) On Grant Vortex Blue oil burners, a steady red light indicates the UV sensor is… | High | Engineer | View Guide |
| SMOKE/FLUE FAULT | Visible Smoke or High Smoke Number Black or grey smoke visible from the flue, or a high smoke number on combustion… | High | Engineer | View Guide |