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boiler service, boiler repair, emergency repair
Worcester Greenstar 24Ri LPG Boiler Fault Codes
| Indication | Fault | Possible solution |
| No light | Permanent mains supply to boiler. Boiler mains switch on. Fuse F1. Fuse F2. Transformer (both coils below 100Ω). Otherwise replace control board (if boiler does not operate correctly). | |
| Light on but boiler not operating during demand | Boiler demand live at ST2 terminal LR (is there a demand) By pass is open If either only HW or CH is operating check diverter valve/frost stat/ room stat/programmer. Otherwise replace control board. | |
| *Slow flash (normally off, flashes on) | Ignition lockout | Gas present and at correct pressure. Combustion CO2 level. Flue condition Ignition electrodes/cables/connections Flame sense electrode/cables/connections Gas valve (coils 140-190Ω). Otherwise replace control board. |
| *Slow flash (normally on, flashes off) |
Flue overheat Heat exchanger overheat Flue pressure switch |
Flue temperature too high. Heat exchanger baffles have been removed and not refitted. Water pressure/dry All air vented Pump/cables/connections Water leaks/blockages Safety thermostats/cables/connections Otherwise replace control board Blockage in flue system |
| Fast flash | Volatile lockout (sensor, fan or code plug) | Temperature sensor (8000 - 20000Ω). Wiring/connections to sensor. Fan/cable/connections. Code plug fitted. |
| 2 pulses | Service mode switch in min position. | |
| 5 pulses | Service mode switch in min position. |