Find Your Error Code
Why does the 8000 series have so many error codes?
The 8000 series by Worcester Bosch is a "Smart Boiler". This boiler has more sensors and electronic inputs which lets it provide us with a more accurate description of what is going on. Unlike have 1 error code which may cover many issues, the 8000 has an error code for everything. This helps us diagnose problems fatser and saves you money!
Error Code: 200 O
Cause:
Boiler in heating mode
Difficulty:
1 2 3 4 5
Engineer:
No
Solutions To Try:
Nothing to worry about. Currently in hot water mode.
Error Code: 201 O
Cause:
Boiler in hot water mode
Difficulty:
1 2 3 4 5
Engineer:
No
Solutions To Try:
Boiler in hot water mode. Nothing to worry about.
Error Code: 202 O
Cause:
Boiler in anti-cycle mode
Difficulty:
1 2 3 4 5
Engineer:
No.
Solutions To Try:
Boiler in anti-cycle mode. Nothing to worry about it.
Error Code: 203 O
Cause:
Boiler in standby – no heat energy demand
Difficulty:
1 2 3 4 5
Engineer:
Required
Solutions To Try:
Visibly look for the spark
Error Code: 204 O
Cause:
Current primary water temperature higher than set value
Difficulty:
1 2 3 4 5
Engineer:
No
Solutions To Try:
Water in tank is warmer than request. Nothing to worry about.
Error Code: 208 O
Cause:
Chimney sweep demand.
Difficulty:
1 2 3 4 5
Engineer:
Required
Solutions To Try:
Service mode option for engineer.
Error Code: 224 V
Cause:
Safety temperature limiter has tripped.
Difficulty:
1 2
3 4 5
Engineer:
No
Solutions To Try:
Top-up water until the reset pressure is reached. If that doesn't work you may need an engineer to bleed the system and re-check the boilers status.
Error Code: 227 V
Cause:
No flame signal after ignition.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer will need to check the burner control unit. Could need replacing.
Error Code: 228 V
Cause:
Flame signal without flame present.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Check ionisation cable. Possibly needs replacing. Check gas control valve.
Error Code: 305 0
Cause:
Boiler in hot water anti-cycle mode.
Difficulty:
1 2 3 4 5
Engineer:
No
Solutions To Try:
Nothing to worry about it.
Error Code: 306 0
Cause:
Flame signal after closing the fuel supply.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check gas ratio control valve.
Error Code: 360 V
Cause:
Incompatible code plug.
Difficulty:
1 2
3 4 5
Engineer:
Required
Solutions To Try:
Check if a correct code plug is installed and exchange or reconnect code plug.
Error Code: 815W/B
Cause:
Low loss header temperature sensor faulty.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Engineer to check the sensor port or check the differential sensor for incorrect installation position or breakage. Correct the installation.
Error Code: 1010 O
Cause:
No BUS communication cable, EMS-Bus isn’t connected or damaged.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to connect the cable for the EMS-Bus or replace the damaged cable exchange fuse.
Error Code: 1017 W
Cause:
Water pressure too low.
Difficulty:
1 2
3 4 5
Engineer:
Required
Solutions To Try:
The water needs topping up and the vent system or pressure sensor may need replacing
Error Code: 1021 B
Cause:
Hot water temperature sensor is defective.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Engineer to check the plug to the hot water temperature, sensor may not be connected.
Error Code: 1022 B
Cause:
Hot water storage temperature sensor is defective.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Connect the plug to the hot water temperature sensor correctly, mount the hot water temperature sensor correctly or replace the hot water temperature sensor.
Error Code: 1037 B
Cause:
Outside temperature sensor is defective.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Check the connecting lead.
Error Code: 1065 B
Cause:
Pressure sensor defective or not connected.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Check pressure sensor connection as it may need replacing or cleaning.
Error Code: 1068 W
Cause:
Outside temperature sensor defective.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Check the connecting lead.
Error Code: 1074 W
Cause:
No signal from the flow temperature sensor available.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Connect the plug to the flow temperature sensor correctly or temperature sensor could need replacing.
Error Code: 1073 W
Cause:
Short circuit of the flow temperature sensor.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check temperature sensor and check circulation in the sytem. May need replacing.
Error Code: 1075 W
Cause:
Short circuit of the temperature sensor at the heating block.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Temperature sensor may need replacing.
Error Code: 1076 W
Cause:
No signal from the temperature sensor at the heating block available.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer will need to check the connecting lead or the control unit. May need replacing.
Error Code: 2920 V
Cause:
Error with the flame monitoring.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check connection, leads and flame detection probe.
Error Code: 2924 V
Cause:
No feedback from the modulating gas valve. The gas valve relay is defective.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer will need to restart the boiler and check gas valve.
Error Code: 2925 V
Cause:
Feedback from the modulating gas valve is too low.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer will need to check connection on gas valve.
Error Code: 2927 B
Cause:
Flame failed during burner operation.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check gas inlet. Check elctrode, leads and flue system.
Error Code: 2946 V
Cause:
Incorrect code plug detected.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Tthe code plug needs replacing.
Error Code: 2948 B
Cause:
No flame signal.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check electrode, leads and burner assembly.
Error Code: 2950 B
Cause:
No flame signal.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check electrode, leads and burner assembly.
Error Code: 2963 B
Cause:
Signal from flow and heat exchanger temperature sensor outside the permissible range.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer will be required to check temprature sensor, connecting leads and circulation.
Error Code: 2965 B
Cause:
Flow rate in heat exchanger is too low.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Flow temperature too high.
Error Code: 2964 B
Cause:
Flow rate in heat exchanger is too low.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer will need to check for blockages or faulty heat exchanger.
Error Code: 2966 B
Cause:
Flow temperature rise in heat exchanger too rapid.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer needs to check for blockages in system or boiler. Temprature sensors and heat exchanger will need checking also.
Error Code: 2970 B
Cause:
Pressure drop in heating system too rapid.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check connections on pressure sensor and check for leaks.
Error Code: 2967 B
Cause:
Flow / heat exchanger temperature sensor differential too great.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Check for air in the system, blockages and check sensors and heat exchange.
Error Code: 2971 B
Cause:
System pressure too low.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
The heating system needs venting or water needs topping up until the preset pressure is reached. Replace the cable to the pressure sensor replace the pressure sensor.
