Verified boiler fault code
Grant pump Run/Fault LED: red Fault Code (Vortex Pro External)
The Wilo-PARA circulating-pump table identifies a constant red Run/Fault LED as the pump being stopped.
Safety disclaimer
Fault code summary
- Manufacturer
- Grant
- Fault code
- pump Run/Fault LED: red
- Fault type
- Pump, Circulation, Electrical
- Severity
- high
- Reset
- The manual describes a pump manual-restart function for the service procedure; it is not a general homeowner boiler reset.
- Applicable models
- Vortex Pro External 15-26, Vortex Pro External 26-46, Vortex Pro External 46-70
Quick answer
The Wilo-PARA circulating-pump table identifies a constant red Run/Fault LED as the pump being stopped.
What does this fault code mean?
The Wilo-PARA circulating-pump table identifies a constant red Run/Fault LED as the pump being stopped.
Common causes
- Pump rotor blocked
- Winding defective
Symptoms
- Pump Run/Fault LED constantly red
- Pump stopped
What can the homeowner safely check?
- Record the LED state and arrange a qualified engineer; do not access the pump or live control panel.
Boiler reset information
The manual describes a pump manual-restart function for the service procedure; it is not a general homeowner boiler reset.
When should I call an engineer?
Contact a suitably qualified heating engineer when the fault persists, the boiler locks out, or the manufacturer instructions do not resolve it. For gas appliance work in the UK, use a Gas Safe registered engineer.
Engineer diagnosis
- A qualified engineer should investigate pump blockage, winding, power supply, water quantity and pressure.
Applicable boiler models
Related fault codes
- burner lock-out — Vortex Pro External
The Grant Vortex Pro External control panel provides a burner lock-out reset button; this is an oil-burner indication rather than a numeric boiler code.
Read fault code - overheat thermostat trip — Vortex Pro External
The safety overheat thermostat automatically switches the boiler off if the heat exchanger exceeds 110°C ± 3°C.
Read fault code
Manufacturer documentation
Grant Vortex Pro External Condensing Oil Boiler Range Installation and Servicing Instructions, UK DOC 0121 Rev 2.1Table A1-3 Pump fault diagnosis: | Red | Pump is stopped | Pump rotor blocked | ... | Red | Winding | Winding defective |
Last verified
2026-09-12
Frequently asked questions
What does Grant pump Run/Fault LED: red mean?
The Wilo-PARA circulating-pump table identifies a constant red Run/Fault LED as the pump being stopped.
Can I reset a Grant pump Run/Fault LED: red fault?
The manual describes a pump manual-restart function for the service procedure; it is not a general homeowner boiler reset.