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boiler service, boiler repair, emergency repair
Worcester Commercial GB 162-50/65/80/100 Boiler Fault Codes
| Main Display Code | Sub Display Code | Key to display code | Reset required? | LED on UBA 3 | Other effects |
| - | Operating phase: Communication test while starting up. This display code flashes 5 times within 5 seconds while starting up to indicate that the communication between the UBA 3 and the BC10 basic controller is being tested. If a new UBA 3 or a new KIM was fitted, this code will flash for max. 10 seconds. | Off or flashing at 8 Hz | |||
| - |
Fault: If this code continues to flash on the display, there is a fault in the communication between the UBA 3 and the BC10 basic controller. |
Off or flashing at 8 Hz | |||
| A | 208 | Operating phase: The boiler is in flue gas test or service mode. | Off or flashing at 8 Hz | No heating operation and no DHW. | |
| H | 200 | Operating phase: The boiler is in heating mode | Off | ||
| H | 200 | Operating phase: The boiler is in manual operation mode. | Off | The room temperature is too high. | |
| H | 201 | Operating phase: The boiler is in DHW mode. | Off | ||
| H | 201 |
Operating phase: Pump run-over time via the external hot water cylinder 130 seconds at the minimum speed. The “Burner” LED (On/Off) is off. |
Off | ||
| 0A | 202 |
Operating phase: The switch optimization program is activated. This program is activated if there has been any demand more frequently than once every 10 minutes. This means that the boiler cannot be restarted until at least 10 minutes have elapsed since initial burner start-up. |
Off | The room temperature is not possibly reached. | |
| 0A | 305 | Operating phase: The boiler cannot start up temporarily after a DHW request has ended. | Off | ||
| 0C | 283 | Pre-operative phase: The boiler prepares for a burner start-up whenever a heat demand or a DHW request arises. | Off | ||
| 0E | 265 | Readiness for operation: The boiler is in standby mode. There is a current heat demand, but too much energy has been supplied. | Off | ||
| 0H | 203 | Readiness for operation: The boiler is in standby mode. There is no current heat demand. | Off | ||
| 0L | 284 | Ignition phase: The gas valve is activated. | Off | ||
| 0U | 270 | Start-up phase: The boiler starts up after activation of the mains power supply or completion of a system reset. This code is displayed for a maximum of 4 minutes. | Off | ||
| 0Y | 204 | Operating phase: The flow temperature sensor has detected that the current flow temperature is higher than the flow temperature setting on the BC10, or that it is higher than the flow temperature. Calculated according to heating requirements, or that it is higher than the flow temperature calculated for the DHW mode. | Off | The room temperature is not possibly reached. | |
| 0Y | 276 | Fault: The flow temperature sensor has measured a current flow temperature higher than 95 °C. | No | Off | The room temperature is not possibly reached. |
| 0Y | 277 | Fault: The safety temperature sensor has measured a current safety temperature higher than 95 °C. | No | Off | The room temperature is not possibly reached. |
| 0Y | 285 | Fault: The return temperature sensor has measured a current return temperature higher than 95 °C. | No | Off | The room temperature is not possibly reached. |
| 1L | 211 | Fault: There is no connection between contacts 78 and 50 of the UBA 3 installation base. | No | Off | The room temperature is not possibly reached. |
| 2E | 207 | Fault: The system pressure is too low (less than 0.2 bar). | No | Off | The room temperature is not possibly reached. |
| 2F | 260 | Fault: The flow temperature sensor has not, after burner start-up, detected any temperature increase in the heating system water. | No | Off | |
| 2F | 271 | Fault: The heating water temperature difference, measured between the flow temperature sensor and the safety temperature sensor, is too high. | |||
| 2P | 212 | Fault: The flow temperature sensor has measured a heating water temperature increase of over 5 °C/s. | No | Off | |
| 2U | 213 | Fault: The temperature difference measured between the flow temperature sensor and the return temperature sensor, is more than 50 °C. | No | Off | |
| 2Y | 281 | Fault: The pump has stopped or is running without water. | No | Off | |
| 2Y | 282 | Fault: No feedback from the pump. | No | Off | |
| 3A | 264 | Fault: The tacho signal from the fan has failed during the operating phase. | No | Off | |
| 3C | 217 | Fault: No current of air after a certain time. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 3F | 273 | Operating phase: The appliance has been switched off for a couple of seconds, because it had been running without any interruption for 24 hours. This is a safety check. | No | Off | |
| 3L | 214 | Fault: The tacho signal from the fan is not present during the pre-operative or operating phase. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 3P | 216 | Fault: The fan is running too slowly. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 3Y | 215 | Fault: The fan is running too fast | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 4A | 218 | Fault: The flow temperature sensor has detected a flow temperature of over 105 °C. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 4C | 224 | Fault: There is no bridging cable between contacts 22 and 24 of the UBA 3 contact strip. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 4E | 278 | Fault: The sensor test has failed. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 4F | 219 | Fault: The safety temperature sensor has detected a flow temperature of over 105 °C. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 4L | 220 | Fault: The contacts for the safety temperature sensor have shorted or the safety temperature sensor has detected a flow temperature of over 130 °C. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 4P | 221 | Fault: The contacts for the safety temperature sensor have shorted. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 4U | 222 | Fault: The contacts for the safety temperature sensor have shorted. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 4Y | 223 | Fault: The contacts for the safety temperature sensor have shorted. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 5H | 268 | Operating phase: Component test phase. | No | Off | |
| 6A | 227 | Fault: The system has detected an insufficient ionisation current during the ignition phase. | No | Off | |
| 6A | 227 | Fault: The system has detected an insufficient ionisation current after four start-up attempts. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 6C | 228 | Fault: The system has detected an ionisation current before burner start-up. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 6C | 306 | Fault: An ionisation current has been measured after the burner shut down. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 6L | 229 | Fault: The system has detected an insufficient ionisation current during the operating phase. | No | Off | |
| 6P | 269 | Fault: The glow ignitor was activated for more than 10 minutes. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 6Y | 203 | Fault: The ionisation current is too high. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 7C | 231 | Fault: The power supply was interrupted during a locking fault 4A, 4C, 4E, 4F, 4L, 4P, 4U, 4Y. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 7L | 261 | Fault: The UBA 3 is defect. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 7L | 280 | Fault: The UBA 3 is defect. | Yes | flashing 1 Hz | |
| 8Y | 232 | Operating phase: The external switch contact is open. | Off | No heating operation and no DHW. | |
| 888 | Start-up phase: The boiler starts up after activation of the mains power supply or completion of a system reset. This code is displayed for a maximum of 4 minutes. | On | |||
| 9A | 235 | Fault: The UBA 3 or the KIM is defective. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 9H | 237 | Fault: The UBA 3 or the KIM is defective. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 9H | 267 | Fault: The UBA 3 or the KIM is defective. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 9H | 272 | Fault: The UBA 3 or the KIM is defective. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 9L | 234 | Fault: The contacts for the gas valve have been broken. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 9L | 238 | Fault: The UBA 3 or the KIM is defective. | Yes | flashing 1 Hz | |
| 9P | 239 | Fault: The UBA 3 or the KIM is defective. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| 9U | 233 | Fault: The UBA 3 or the KIM is defective. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| A01 | 800 | Fault: The contacts to the outdoor-temperature sensor have shorted or are interrupted, the sensor has been connected incorrectly or is defective. | No | Off | Minimum outdoor temperature is assumed. |
| A01 | 808 | Fault: The contacts to the DHW temperature sensor have shorted or are interrupted, the sensor has been connected incorrectly or is defective. | No | Off | No DHW is heated any more. |
| A01 | 809 | Fault: The contacts to DHW temperature sensor 2 have shorted or are interrupted, the sensor has been connected incorrectly or is defective. | No | Off | No DHW is heated any more. |
| A01 | 810 | Fault: The boiler water does not warm up. Sensor lead broken or shorted, sensor connected incorrectly or defective, filling pump connected incorrectly or defective. | No | Off | No DHW available, but there is heating operation. The DHW priority is cancelled when the fault message appears. |
| A01 | 811 | Fault: Thermal disinfection has failed. Outlet flow during disinfection period too high, sensor lead broken or shorted, sensor connected incorrectly or defective, filling pump defective. | No | Off | Thermal disinfection was interrupted. |
| A01 | 816 | Fault: No connection to EMS. EMS bus system is overloaded, UBA3/MC10 is defective. | No | Off | The boiler no longer receives a heat demand. The heating system does not heat any longer. |
| A01 | 828 | Fault: Water pressure sensor generates a fault code. The digital water pressure sensor is defective. | No | Off | No heating operation and no DHW. |
| A02 | 816 | Fault: No communication with BC10. Contact problem at BC10 or BC10 is defective. | No | Off | BC10 settings are no longer taken over by RCxx devices. |
| A11 | 802 | Fault: Time not set. Failing time setting, e.g. due to a long power cut. | No | Off | Limited operation of all heating programs and fault list. |
| A11 | 803 | Fault: Date not set. Failing date setting, e.g. due to a long power cut. | No | Off | Limited operation of all heating programs, holiday function, fault list. |
| A11 | 821 | Fault: RC35-HK1 remote control. No remote control assigned, although room temperature control has been set. | No | Off | Limited operation of all heating programs, holiday function, fault list. |
| A11 | 822 | Fault: RC35-HK2 remote control. No remote control assigned, although room temperature control has been set. | No | Off | Since there is no actual room temperature information, room influence and optimization of the switch times do not work. The EMS works on the basis of the values last set on the remote control. |
| A11 | 823 | Fault: RC35-HK1 remote control. No remote control assigned, although frost protection type “FROST” has been set. | No | Off | Since there is no actual room temperature information, room influence and optimization of the switch times do not work. The EMS works on the basis of the values last set on the remote control. |
| A11 | 824 | Fault: RC35-HK2 remote control. No remote control assigned, although frost protection type “FROST” has been set. | No | Off | Since there is no actual room temperature information, room influence and optimization of the switch times do not work. The EMS works on the basis of the values last set on the remote control. |
| A11 | 826 | Fault: RC35-HK1 temperature sensor. The external temperature sensor of the remote control (control unit) of heating circuit 1 is defective. | No | Off | Since there is no actual room temperature information, room influence and optimization of the switch times do not work. The EMS works on the basis of the values last set on the remote control. |
| A11 | 827 | Fault: RC35-HK2 temperature sensor. The external temperature sensor of the remote control (control unit) of the heating circuit is defective. | No | Off | Since there is no actual room temperature information, room influence and optimization of the switch times do not work. The EMS works on the basis of the values last set on the remote control. |
| A12 | 815 | Fault: The contacts to the switch sensor have shorted or are interrupted, the sensor has been connected incorrectly or is defective. | No | Off | Limited operation of all heating programs, holiday function, fault list. |
| A12 | 816 | Fault: WM10 not available or no communication. WM10 or bus circuit connected incorrectly or defective, WM10 is not recognized by the RC35. | No | Off | Heating circuit pump 1 is activated continuously. |
| A18 | 825 | Fault: Conflicting addresses. Both RC25 and RC35 are registered as Master. | No | Off | Both RC35 and RC25 activate heating circuit 1 and DHW. Depending on the heating programs set and the required room temperatures, the heating system can no longer work correctly. DHW mode does not work well. |
| A21 | 806 | Fault: RC25-HK1 temperature sensor. The integrated temperature sensor of the remote control (control unit) of heating circuit 1 is defective. | No | Off | Since there is no actual room temperature information, room influence and optimization of the switch times do not work. The EMS works on the basis of the values last set on the remote control. |
| A21 | 816 | Fault: RC25-HK1 communication. RC25 addressed incorrectly, wired incorrectly or defective. | No | Off | Since there is no actual room temperature information, room influence and optimization of the switch times do not work. |
| A22 | 806 | Fault: RC25-HK2 temperature sensor. The integrated temperature sensor of the remote control (control unit) of heating circuit 2 is defective. | No | Off | Since there is no actual room temperature information, room influence and optimization of the switch times do not work. The EMS works on the basis of the values last set on the remote control. |
| A22 | 816 | Fault: RC25-HK2 communication. RC25 addressed incorrectly, wired incorrectly or defective. | No | Off | Since there is no actual room temperature information, room influence and optimization of the switch times do not work. |
| A32 | 807 | Fault: The contacts to the heating circuit flow sensor have shorted or are interrupted, the sensor has been connected incorrectly or is defective. | No | Off | Heating circuit pump 2 is activated depending on the preset value. The power to the mixer is switched off and the mixer stays in the state it was last put in (can be adjusted manually). |
| A32 | 816 | Fault: MM10 not available or no communication. The heating circuit addresses on the MM10 and the RC35 do not match up, the MM10 or the bus circuit is connected incorrectly or is defective, MM10 is not recognized by the RC35. | No | Off | Heating circuit 2 cannot be operated correctly. MM10 and the mixer automatically goes into emergency operation. Heating circuit pump 2 is activated continuously. Monitor data in the RC35 is invalid. |
| CA | 286 | Fault: The return temperature sensor has measured a return temperature higher than 105 °C. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| CU | 240 | Fault: The contacts for the return temperature sensor have shorted. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| EL | 290 | Fault: The UBA 3 or the KIM is defective. | No | Off | No heating operation and no DHW. |
| E |
242 287 |
Fault: The UBA 3 or the KIM is defective. | Yes | flashing 1 Hz | No heating operation and no DHW. |
| H7 | Operating phase: The system pressure is too low (less than 1.0 bar). | No | Off | Possibly no heating operation or no DHW available. | |
| H7 | Operating phase: The system pressure is too low (less than 1.0 bar). | No | Off | Possibly no heating operation or no DHW available. | |
| P-- | Operating phase: The system pressure is too high (over 4.0 bar) or the pressure sensor has not detected a system pressure (boiler functioning normally). | No | Off | ||
| rE | Fault: Reset is carried out. After pressing the “Reset” button this code is displayed for 5 seconds. | Off |