![]() ![]() The safety or flow temperature can be reset by turning the modulating gas valve anticlockwise to trigger a reset position. The signal from the heat exchanger temperature sensor is out of range for the primary flow temperature. This is not something that you can change in the control box, if the temperature sensor is defective, it will need to be replaced. If the flow temperature sensor or hot water temperature sensor on the burner control unit is too high, these boiler error codes will appear. Trustpilot Flow Temperature Sensor Too High: E5 218 Connections need checking, and the boiler should be reset if ionisation detected after ignition to resolve the issue. If the temperature sensor correctly installed, the pressure should be between 1.0 and 1.5 bars. This shows that there is a loss of ionisation signal detected before burner start or during operation. WORCESTER BOSCH HIGHFLOW 400 TROUBLESHOOTING CODEThis should reset the high limit thermostat activated code and prevent the gas thermostat overheat EA codes fault to appear. To restart the temperature flow sensor short circuit, turn the boiler off and on again to trigger the low mains voltage. This can indicate that the safety temperature limiter has tripped and needs replacing. This indicates that the flow temperature too high and will need checking to return temperature back to the normal state. The temperature sensor may need replacing. Once this is detected, check the safety temperature valve is between 1 and 1.5 pulses, check service mode on the burner control unit if this is the case. This means the primary flow is operating at minimum burner level. If turning the control box or heat on and off again does not solve the issue, an engineer will need to be called. Turning the box or heat control reset button can solve this issue in your combi boiler. This can cause air-gas ratio control issues in the Worcester boiler. When this code appears, it means that the pump stuck or running with air in the system, which is an internal error. The codes fault will need to be solved by a boiler engineer or through getting a new boiler if you are no longer under warranty. These are not issues you can handle yourself if they appear on your combi boiler. ![]() Check the connecting lead as it might show that the electrode or ignition lead has been damaged, which will prevent a flame signal. ![]() This code can be a sign that the operation is defective. This can cause the flue gas thermostat overheat and needs to be solved quickly. This fault code can also indicate that the condensate discharge pipe is blocked or frozen, in which airflow stopped during operation. This can indicate that the gas valve may need replacing, but it can also be a sign that the gas ratio control valve needs adjusting which you can do yourself. This code indicates an issue with the gas valve, as no flame can be found. When this code appears on the control box of your Worcester boiler, it can mean several different things. No Flame Signal Due To Blockage or Internal Leak: EA 227 When you see the fault codes for the Heat Control Module (HCM) is defective an engineer needs to be called to check your Worcester BOSCH boiler as it may need replacing. A fault code indicating that the heat control module (HCM) is defective on your boiler, could also be a sign that the incorrect HCM fitted 9U. This indicates that the control box or the Heat Control Module (HCM) is defective on your Worcester BOSCH. The fan speed might return back to normal once you have restarted the boiler, if not it needs checking by a boiler engineer. This fault code indicates that the fan speed in your Worcester Greenstar boiler is too high. The following fault codes can appear on a Worcester BOSCH Greenstar boiler for various reasons: Fan Speed Error: C6 215 If the error code appears once the boiler has rebooted, it is time to look further into it. In some cases, an error code might show even if there is not a mechanical problem so to save yourself time and effort try turning the device off to see whether it goes away. We have all heard the classic 'turn it off and on again' as a solution for when things go wrong, but there is some truth behind the cliché. ![]() WORCESTER BOSCH HIGHFLOW 400 TROUBLESHOOTING FREEGet a free fixed price quote for a new boiler installed fast! Have You Reset The Boiler? In some cases, your boiler might be backed by a ten-year warranty which can make it cheaper to have any issues resolved by a professional. Worcester is renowned for having long warranties on their boilers, so the first thing to do whenever an issue arises is to check whether you are still covered. ![]()
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