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boiler service, boiler repair, emergency repair
Worcester Greenstar 24 Boiler Fault Codes
| Display | Description | Remedy |
| A7 | DHW temperature sensor faulty. | Check the temperature sensor and connecting lead for breaks or short circuits. |
| A8 | Communication fault. | Check BUS device connecting lead |
| Ad | Cylinder temperature sensor not detected. | Check cylinder temperature sensor and connecting lead. |
| b1 | Code plug not detected. | Insert code plug correctly, test and replace if necessary. |
| b2 | Internal data error. | See servicing instructions for heating contractors. |
| b3 | ||
| C6 | Fan not running. | Check fan lead and connector, check fan, replace as necessary. |
| CC | Outside temperature sensor not detected. | Check outside temperature sensor and connecting lead for breaks. |
| d3 | External limiter has tripped. | Temperature limiter TB1 has tripped. Jumper across 8-9 or PR-P0 is missing. |
| d5 | External primary NTC on low loss header defect. | Check NTC and cable continuity. |
| E2 | Temperature sensor in CH flow faulty. | Check the temperature sensor and connecting lead. |
| E9 |
Heat exchanger temperature limiter or flue gas temperature limiter has tripped. or Flue pipe is blocked. |
Check system pressure, temperature limiter, pump operation, fuse on PCB bleed appliance. Check water-side of heat exchanger. On appliances with displacement bodies in heat exchanger, check whether displacement bodies are fitted. Check the flue (fresh air or exhaust gas) pipe blockage, check air pressure switch and air pressure switch pipe. Check heat exchanger high limit stat and flue high limit stat |
| EA | Flame not detected. | Is gas tap open? Check gas supply pressure, mains power connection, electrodes and leads, flue pipe, gas-air ratio. On natural gas appliances, check external gas flow switch. |
| F0 | Internal fault. | Check electrical connectors and ignition leads, replace PCB if necessary. Check gas-air ratio. |
| F1 | Internal data error | See servicing instructions for heating contractors |
| F7 | A flame is detected although the appliance is switched off | Check electrodes. Flue system OK? Check PCB for moisture. |
| FA | A flame is detected after the gas has been switched off | Check gas valve. Clean condensate trap and check electrodes. Flue system OK? |
| Fd | Reset was pressed in error. | Press reset again |