Worcester Bosch
Greenstar 8000 Life 30kW
Combi Boiler
30kW
2018-present
ErP A
80 fault codes
<p>The Greenstar 8000 Life 30kW is a combi boiler from Worcester Bosch, available at 30kW output. Produced 2018-present.</p>
Greenstar 8000 Life 30kW Fault Codes 80
Code
Description
Severity
Type
1017 W
Low Water Pressure Warning (8000 Series)
On Worcester Greenstar 8000 boilers, code 1017 W indicates the system water pressure is too low.…
Low
DIY
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1065 B
Pressure Sensor Defective (8000 Series)
On 8000 Series boilers, code 1065 B indicates the pressure sensor is not connected or has…
Medium
Engineer
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1073 W
Flow Temperature Sensor Short Circuit (8000 Series)
On 8000 Series boilers, code 1073 W indicates a short circuit in the flow temperature sensor.
Medium
Engineer
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1074 W
Flow Temperature Sensor No Signal (8000 Series)
On 8000 Series boilers, code 1074 W means the flow temperature sensor is not providing a…
Medium
Engineer
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224 V
Safety Temperature Limiter Tripped (8000 Series)
On 8000 Series boilers, code 224 V means the safety temperature limiter has operated. 'V' indicates…
High
Engineer
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227
Ignition Lockout (Older CDi Models)
On older Worcester Greenstar CDi models, fault code 227 indicates ignition failure after multiple attempts.
Medium
DIY
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227 V
No Flame Signal (8000 Series Lockout)
On 8000 Series boilers, code 227 V is a lockout (V = lockout) for no flame…
Medium
DIY
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2927 B
Flame Lost During Operation (8000 Series)
On 8000 Series boilers, code 2927 B means the ionisation current was insufficient during the burning…
Medium
DIY
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2948 B
No Flame Signal (8000 Series)
On Greenstar 8000 boilers, code 2948 B indicates no flame signal was detected. At low output…
Medium
Engineer
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2965 B
Flow Temperature Too High (8000 Series)
On 8000 Series boilers, code 2965 B means the flow temperature has exceeded safe limits.
High
Engineer
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2965 V
Flue Gas Sensor Short Circuit
The flue gas NTC has a short circuit.
Medium
Engineer
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2970 B
System Pressure Drop Too Rapid (8000 Series)
On 8000 Series boilers, code 2970 B means system pressure is dropping at an unusually rapid…
High
Engineer
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2971 B
System Pressure Too Low (8000 Series)
On 8000 Series boilers, code 2971 B indicates system pressure is below the minimum. The boiler…
Low
DIY
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360 V
Incompatible Code Plug (8000 Series)
On 8000 Series boilers, code 360 V means the code plug (boiler identification module) is not…
Medium
Engineer
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6A
Safety Fuse Fault
The internal safety fuse has blown. This can be caused by tampering, poor maintenance, or loose…
High
Engineer
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9U
Blocked Condensate / Condense Sensor
The condensate system is blocked or the condensate sensor is indicating a problem. Most commonly caused…
Medium
DIY
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9U 257
Appliance Variant Not Set
The boiler variant has not been correctly configured.
High
Engineer
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A1
Pump Stuck or Running Dry
The circulation pump is not running correctly — either it is seized, running without water, or…
High
Engineer
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A21
Thermostat / Receiver Communication Fault
The boiler cannot communicate with the wireless thermostat receiver. Usually caused by low batteries in the…
Low
DIY
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A21 281
Pump Blockage / Circulation Fault
The pump is blocked, preventing proper water circulation through the system.
High
Engineer
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A22
Loss of RF Signal
The boiler has lost the wireless radio frequency signal from the room thermostat. The thermostat may…
Low
DIY
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A281
Internal Water Leak Detected
The boiler has detected an internal water leak. Water may be dripping onto internal components which…
High
Engineer
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A61
Gas Valve Fault
There is a fault with the gas valve — it may not be opening or closing…
High
Engineer
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A7
Flow Temperature Sensor Fault
The flow NTC thermistor is giving a reading outside its expected range. Similar to E2, typically…
Medium
Engineer
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A7 246
Diverter Valve Fault
The diverter valve is not switching correctly between heating and hot water.
Medium
Engineer
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A8
Return Temperature Sensor Fault
The return NTC thermistor is giving an out-of-range reading.
Medium
Engineer
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A8 246
DHW Thermistor Fault
The domestic hot water NTC sensor has a fault.
Medium
Engineer
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B1
PCB Internal Fault
The main Printed Circuit Board has detected an internal error it cannot recover from.
High
Engineer
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B7
Gas Valve Short Circuit
A short circuit has been detected in the gas valve wiring or the valve itself.
High
Engineer
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B7 257
Internal Communication Error
There is an internal communication error between boiler components, typically involving the printed circuit board (PCB).
High
Engineer
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C1
Fan Fault / Air Pressure Switch Fault
The fan is not running at the correct speed or the air pressure switch is not…
High
Engineer
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C1 221
Flow Sensor Short Circuit
The flow NTC sensor wiring has a short circuit.
Medium
Engineer
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C1 238
Return Sensor Short Circuit
The return NTC sensor wiring has a short circuit.
Medium
Engineer
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C4
Flue Temperature Sensor Fault
The flue gas temperature sensor is giving an out-of-range or implausible reading.
Medium
Engineer
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C4 218
Air Pressure Switch Stuck Closed
The APS is stuck in the closed position.
High
Engineer
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C6
Fan Speed Error
The boiler fan is not running at the correct speed. This prevents safe ignition as the…
High
Engineer
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C7
Fan Overspeed Error
The boiler fan is running faster than its rated speed, which can indicate a fault with…
High
Engineer
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CE 201
Flow Temperature Sensor Fault
The flow temperature sensor (NTC thermistor) has a fault in its wiring or the sensor itself…
Medium
Engineer
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CE 203
Flow Sensor Fault
The flow temperature sensor is giving an implausible or out-of-range reading.
Medium
Engineer
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CE 207
Low Water Pressure
The boiler's water pressure has dropped below the safe minimum level. One of the easiest faults…
Low
DIY
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CE 210
Primary Flow Sensor Fault
The primary flow NTC sensor is giving an out-of-range reading on modern Greenstar models.
Medium
Engineer
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D1 200
Heating System Circulation Fault
The boiler is detecting poor water circulation in the heating system. The temperature difference between flow…
Medium
Engineer
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D1 204
Boiler Identification Module Fault
The boiler's identification module (SCB) is not communicating correctly with the main PCB. Usually occurs after…
Medium
Engineer
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D1 218
Flow/Return Temp Difference Too High
Poor circulation — the temperature gap between flow and return is abnormally large.
Medium
Engineer
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D3
External Thermostat Short Circuit
The external thermostat or room controller wiring has a short circuit. The boiler cannot receive a…
Medium
Engineer
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D3 218
External Thermostat Circuit Fault
The wiring from the room thermostat has a fault.
Medium
Engineer
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D4
System Purge Required / Air in System
Air has been detected in the primary circuit after a period of non-use or maintenance work.…
Low
DIY
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D5
Primary Flow Thermistor Fault
The main flow temperature sensor is giving an out-of-range reading, preventing the boiler from monitoring water…
Medium
Engineer
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E2
Flow NTC Sensor Fault
The flow temperature sensor (NTC thermistor) is giving an incorrect reading — either out of range…
Medium
Engineer
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E2 218
Flow Temperature Sensor Fault
The flow temperature NTC sensor has developed a fault. It may be reading incorrectly or have…
Medium
Engineer
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E5
Flow Temperature Too High
The boiler flow temperature has exceeded 105°C — the maximum safe limit. A serious overheat condition.
High
Engineer
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E9
Overheat Fault
The boiler's safety thermostat has detected dangerously high temperatures and triggered a lockout. Usually caused by…
High
Engineer
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E9 219
Safety Sensor Fault — Temperature Exceeded
The safety temperature sensor has detected a temperature in excess of 105°C, or the sensor contacts…
High
Engineer
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E9 224
Overheat — Safety Limiter Tripped (Code 224)
The safety temperature limiter has tripped due to overheating. Sub-code 224 typically indicates this occurred during…
High
Engineer
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E9 277
Safety Sensor High Temperature (GB162)
On Worcester GB162 commercial boilers, code E9 277 means the safety temperature sensor has measured a…
High
Engineer
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EA 227
Ignition Failure / No Flame Detected
The boiler has failed to detect a flame after four ignition attempts, triggering a safety lockout.…
Medium
DIY
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EA 229
Flame Loss During Operation
The boiler ignited successfully but then lost the flame during operation. Very common in winter due…
Medium
DIY
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EA 234
Flame Not Detected After Start
The boiler attempted to start but could not detect a flame. Similar to EA 227, this…
Medium
DIY
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EA 261
Heat Control Module (HCM) Potentially Defective
On Greenstar i boilers, EA 261 indicates the Heat Control Module (HCM) may be defective. The…
Medium
DIY
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EA 306
Flame Lost After 10 Seconds
Flame established but lost within 10 seconds.
High
Engineer
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EA 338
Flame Detected When Not Expected
The boiler has detected a flame signal when the gas valve should be closed. This is…
High
Engineer
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EF
Maximum Reset Count Exceeded
The boiler has been reset too many times without the underlying fault being resolved, and has…
High
Engineer
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EF 349
Central Heating Boil Detected
The boiler is operating at minimum burner load but the temperature difference between flow and return…
High
Engineer
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F0
Internal Component Fault
A general internal fault code indicating a component has failed. The specific sub-code (e.g. F0 238)…
High
Engineer
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F7
Flame Detected After Shutdown (Unsafe)
The boiler's ionisation circuit is detecting a flame signal when the gas valve should be closed.…
High
Engineer
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FA
Flue Condensate Blocked / Siphon Full
The condensate siphon inside the boiler is full or blocked, preventing the boiler from starting. Common…
Medium
DIY
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FA 306
False Flame — Ionisation After Burner Stop
The boiler has detected ionisation current (flame signal) after the burner has been commanded to stop.…
High
Engineer
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FD
Temperature/Pressure Sensor Combination Fault
Multiple sensor faults have been detected simultaneously, or the temperature/pressure combination is outside safe operating parameters.
High
Engineer
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FD 231
Mains Power Interrupted During Lockout
The mains power supply was interrupted while the boiler was in a lockout state. This code…
Low
DIY
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H02
Central Heating Sensor Fault
The central heating temperature sensor is giving an incorrect reading.
Medium
Engineer
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H02 218
Status: Heating Demand
The boiler is running to satisfy a central heating demand. Normal operation.
Medium
DIY
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H06
Gas Valve Fault
The gas valve is not operating correctly according to the boiler control system.
High
Engineer
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H06 218
Status: DHW Demand
The boiler is running to provide hot water. Normal operation.
Medium
DIY
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H07
Low Water Pressure Warning
A low pressure warning code displayed on some Worcester Greenstar models. The boiler may continue to…
Low
DIY
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HRE
Boiler Resetting Frequently
The boiler has been resetting itself repeatedly. This indicates a recurring fault that the boiler is…
Medium
Engineer
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