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boiler service, boiler repair, emergency repair
Worcester Greenstar ZWB7-25R HE Boiler Fault Codes
| Code | Description | Remedy |
| A7 | Hot water NTC sensor defective. | Check hot water NTC sensor and connecting lead for circuit breaks/short circuits. |
| A8 | Break in communication | Check connecting lead to programmer |
| AC | Module not detected. | Check connecting lead between TA211E/TR212E and Heatronic |
| b1 | Code plug not detected. | Insert code plug correctly, test and replace if necessary. |
| C1 | Fan speed too low. | Check fan lead and connector, and fan; replace as necessary. |
| d3 | Jumper 8-9 not detected. | Connector not connected, link missing, underfloor heating limiter tripped. |
| E2 | CH flow NTC sensor defective | Check CH flow NTC sensor and connecting lead. |
| E9 | Safety temp. limiter in CH flow has tripped. | Check system pressure, check safety temp. limiters, check pump operation, check fuse on pcb, bleed appliance. |
| EA | 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 CO2 level. |
| F0 | Internal error. | Check electrical connector contacts, programmer interface module ignition leads and bus module are not loose; replace pcb or bus module if necessary. |
| F7 | Flame detected even though appliance switched off. | Check electrode assembly, dry pcb. Flue clear? |
| FA | Flame detected after gas shut off. | Check gas valve and wiring to gas valve. Clean condensation trap and check electrode assembly. Flue clear? |
| FC | Textdisplay not detected. | Check connecting lead between Textdsiplay and Heatronic , replace Textdisplay if necessary |
| Fd | Reset button pressed by mistake. | Press reset button again |
|
P1,P2,P3, P1... |
Please wait, initialisation in progress. | 24 V fuse blown. Replace fuse. |