| Display Code | Repair | Description | Remedy | Resources |
|---|---|---|---|---|
| A1 | Link | Pump has run dry or pump has stalled/seized. | Check for water leaks. Free the pump or replace. | |
| A7 | Link | Hot water NTC sensor defective. | Check hot water NTC sensor and connecting lead for circuit breaks/short circuits. | |
| A8 | Link | Break in communication to TD200 or/and RT10. | Check electrical connections. | |
| b1 | Link | Code plug not detected. | Insert code plug correctly, test and replace if necessary. | |
| C6 | Link | Fan speed too low. | Check fan lead and connector, and fan; replace as necessary. | |
| E2 | Link | CH flow NTC sensor defective. | Check CH flow NTC sensor and connecting lead. | |
| E9 | Link | Safety temp. limiter in CH flow has tripped. | Check system pressure, check safety temp. limiters, check pump operation, check fuse on pcb, bleed appli- ance. | |
| EA | Link | Flame not detected. | Is gas cock turned on? Check gas supply pressure, power supply, igniter electrode and lead, ionisation sensing electrode and lead, flue duct and C02 level. | |
| F0 | Link | Internal error. | Check electrical connector contacts, programmer inter- face module ignition leads are not loose; replace pcb if necessary. | |
| F7 | Link | Flame detected even though appliance switched off. | Check electrode assembly, dry pcb. Flue clear? | |
| FA | Link | Flame detected after gas shut off. | Check gas valve and wiring to gas valve. Clean conden- sation trap and check electrode assembly. Flue clear? | |
| Fd | Link | Reset button pressed by mistake. | Press reset button again. | |
| -¦¦- and XX | Link | Siphon fill mode | Wait approx 15 mins |
Worcester Bosch Fault Codes
Welcome to the fault-codes section of this site. The following table or page contains the information required to help repair and diagnose the fault codes being shown on the boiler display. You may be guided through the fault finding sequence or steps, for rectifying your boiler with this fault code. Suggested repair solutions may be provided by a link to a repair page. NB Some fault codes are only applicable to a specific range of boilers only.
Disclaimer: Information on this website is provided for informational purpose therefore we cannot accept liability for subsequent problems. All repair tasks should be carried out by qualified trades people. We may also receive commission payments when you are taken to external websites and complete purchases from third party sellers, once you leave our site, we cannot be held liable for your purchases.