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boiler service, boiler repair, emergency repair
Worcester Greenstar 8000 Stile combi GR8700iW 50C Boiler Fault Codes
| Code | Category | Description | Remedy |
| 200 | O | Boiler in heating mode | - |
| 201 | O | Boiler in hot water mode | - |
| 202 | O | Boiler in anti-cycle mode | - |
| 203 | O | Boiler in standby, no heat energy demand | - |
| 204 | O | Current prim. water temp. higher than set val. | - |
| 208 | O | Chimney sweep demand | - |
| 224 | V | Safety temp. limiter has tripped |
1. Open the closed valve in the heating circuit. 2. Top up water until the preset pressure is reached. 3. Connect the plug correctly to the safety temperature limiter. 4. Replace the safety temperature limiter. |
| 227 | V | No flame signal after ignition |
1. Open the gas isolator. 2. Change the gas installation. 3. Replace the control unit/burner control unit. 4. Replace the ignition electrode. 5. Replace the monitoring electrode. 6. Replace the ignition cable. 7. Replace the ionisation cable. 8. Replace the air/gas ratio control valve. 9. Correct the burner setting. |
| 228 | V | Flame signal without flame present |
1. Replace the air/gas ratio control valve. 2. Replace the ionisation cable. 3. Replace the control unit/burner control unit. |
| 305 | O | Boiler in hot water anti-cycle mode | - |
| 306 | V | Flame signal after closing the fuel supply |
1. Replace the air/gas ratio control valve. 2. Replace the ionisation cable. 3. Replace the control unit/burner control unit. |
| 815 | B | Low loss header temp. sensor faulty |
1. Check the sensor port. 2. Check the differential sensor for incorrect installation position or breakage. |
| 1017 | W | Water pressure too low |
1. Top up water and vent the system. 2. Replace the pressure sensor. |
| 1021 | B | Hot water temperature sensor is defective |
1. Connect the plug to the hot water temperature sensor correctly. 2. Mount the hot water temperature sensor correctly. 3. Replace the hot water temperature sensor. 4. Replace the connecting lead to the hot water temperature sensor. |
| 1037 | W | Outside temperature sensor defective | Check the connecting lead. |
| 1065 | B | Pressure sensor defective or not connected |
1. Connect the plug to the pressure sensor correctly. 2. Replace the connecting lead to the pressure sensor. 3. Replace the pressure sensor. 4. Replace the control unit. |
| 1068 | W | Outside temperature sensor defective | Check the connecting lead. |
| 1073 | W | Short circuit of the flow temperature sensor |
1. Replace the temperature sensor. 2. Replace the connecting lead to the temperature sensor. 3. Replace the control unit. |
| 1074 | W | No signal from the flow temperature sensor available |
1. Connect the plug to the flow temperature sensor correctly. 2. Replace the flow temperature sensor. 3. Replace the connecting lead to the flow temperature sensor. 4. Replace the control unit. |
| 1075 | W | Short circuit of the temperature sensor at the heating block |
1. Replace the temperature sensor. 2. Replace the connecting lead to the temperature sensor. 3. Replace the control appliance. |
| 1076 | W | No signal from the temperature sensor at the heating block available |
1. Replace the temperature sensor. 2. Replace the connecting lead to the temperature sensor. 3. Replace the control unit. |
| 2920 | V | Fault in flame monitoring | - |
| 2927 | B | Flame failed during burner operation |
1. Open the main shut-off valve. 2. Open the appliance shut-off valve. 3. Shut down the appliance and check the gas line. 4. Signal evaluation on printed circuit board defective. 5. Replace the ionisation electrode. 6. Establish protective conductor connection (PE) in the control unit. 7. Replace the ignition cable. 8. Replace the connecting lead to the ionisation electrode. 9. Replace the air/gas ratio control valve. 10.Set the burner correctly. 11.Set the burner at minimum rated load. 12.Check the integrity flue system. 13.The interconnected room air supply is too small or the size of the ventilation opening is too small. 14.Clean the heating block on the flue gas side. 15.Replace the control unit/burner control unit. |
| 2946 | V | Incorrect code plug detected | Replace the code plug. |
| 2948 | B | No flame signal with low output |
The burner starts automatically after cleaning. 1. If the fault occurs repeatedly: check the settings of the CO2 values. |
| 2950 | B | No flame signal following starting procedure |
The burner starts automatically after cleaning. 1. Set the correct gas/air ratio correctly. |
| 2963 | B | Signal from flow and heat exchanger temperature sensor outside the permissible range | Connect the connecting lead correctly. |
| 2964 | B | Flow rate in heat exchanger too low | - |
| 2965 | B | Flow temperature too high | - |
| 2966 | B | Flow temperature rise in heat exchanger too rapid | - |
| 2967 | B | Flow/heat exchanger temperature sensor differential too great | - |
| 2970 | B | Pressure drop in heating system too rapid | - |
| 2971 | B | System pressure too low |
1. Vent the heating system. 2. Top up water until the preset pressure is reached. 3. Replace the cable to the pressure sensor. 4. Replace the pressure sensor. |
| Appliance Faults | Remedy |
| Combustion noises too loud; rumbling noises |
▶ Check the gas type. ▶ Check the gas supply pressure. ▶ Check the flue system; clean or repair if required. ▶ Check the gas/air ratio. ▶ Check the air/gas ratio control valve; replace if required. |
| Flow noises | ▶ Set the pump rate or pump characteristic map correctly and match to the maximum output. |
| Heat-up takes too long | ▶ Set the pump rate or pump characteristic map correctly and match to the maximum output |
| Flue gas values incorrect; CO content too high. |
▶ Check the gas type. ▶ Check the gas supply pressure. ▶ Check the flue system; clean or repair if required. ▶ Check the gas/air ratio. ▶ Check the air/gas ratio control valve; replace if required. |