| 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 to TD200 or/and RT10. |
Check electrical connections. |
| b1 |
Code plug not detected. |
Insert code plug correctly, test and replace if necessary. |
| C6 |
Fan speed too low. |
Check fan lead and connector, and fan; replace as necessary. |
| 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 C02 level. |
| F0 |
Internal error. |
Check electrical connector contacts, programmer interface module ignition leads are not loose; replace pcb 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? |
| Fd |
Reset button pressed by mistake. |
Press reset button again. |
