Remeha Avanta Plus Fault Codes – Causes, Fixes & Engineer Advice

Understanding Remeha Avanta Plus Fault Codes

Remeha Avanta Plus fault codes appear as alphanumeric codes on the boiler's control panel. Each code relates to a particular component or operating condition.

The boiler uses sensors, pumps and safety controls to monitor its operation. When it detects a problem, it may stop operating until the fault has been resolved.

This is an important safety feature. A fault code can help an engineer identify the likely area of the problem, but the code does not always identify the failed component by itself.

Common Remeha Avanta Plus Fault Codes

E0 Fault Code: Temperature Sensor Fault

The Remeha Avanta Plus E0 fault code indicates a problem with the flow, return or boiler temperature sensor. Possible causes include a damaged temperature sensor, loose or broken electrical connections, or a short circuit in the sensor wiring.

The sensor and its connections may need to be tested. If the sensor is faulty, replacement may be required.

E1 Fault Code: Overheat / Flow Temperature Too High

The E1 fault code indicates that the flow temperature has exceeded its maximum limit. Possible causes include low system water pressure, trapped air, blockages affecting water flow, or a faulty pump.

The system pressure, circulation and pump operation should be checked. If the fault continues after basic checks, an engineer may need to investigate the cause.

E2 Fault Code: Return Temperature Higher Than Flow

The E2 code means the return water temperature is higher than the flow temperature, which indicates abnormal operation. Possible causes include low water pressure, trapped air, flow or return sensor wiring faults, or a blockage affecting circulation.

The system pressure, pump operation and sensor connections may need to be checked.

E3 Fault Code: Control Unit or Earth Fault

The E3 fault can indicate a problem with the control unit or an issue with the electrical supply and earthing. Possible causes include an incorrectly earthed mains supply or a faulty control unit.

Electrical faults should be investigated by a suitably qualified professional.

E4 Fault Code: Ignition Failure

The Remeha Avanta Plus E4 fault code indicates an ignition failure. The boiler has been unable to establish a flame when attempting to start. Possible causes include faulty ignition leads or electrodes, gas supply interruption, a blocked gas valve, air in the gas line, or a faulty PCB.

First, check whether other gas appliances are working normally. If they are, you can try resetting the boiler by turning it off for around 30 seconds and switching it back on.

If the E4 fault returns, the boiler needs professional diagnosis. Ignition and gas-related faults should be dealt with by a Gas Safe registered engineer.

E5 Fault Code: Gas Supply Issues

The Remeha E5 fault code indicates a problem with the gas supply to the boiler. Possible causes include gas meter problems, a faulty gas valve, interruption to the gas supply, a blocked gas line, or incorrect gas pressure.

Do not attempt to repair gas supply or gas valve problems yourself. If other gas appliances are also affected, contact your gas supplier to check whether there is a wider supply problem. If the gas supply is normal, an engineer can investigate the boiler.

E6 Fault Code: Flame Detected When Boiler Is Off

The E6 fault occurs when the boiler detects a flame despite being switched off. This is typically linked to a faulty PCB. A heating engineer should inspect the boiler and replace the control component if required.

E7 Fault Code: Air Pressure Switch Problems

The Remeha Avanta Plus E7 fault code indicates a problem with the air pressure switch, which monitors combustion air flow and flue gas removal. Possible causes include a blocked flue or air intake, a faulty air pressure switch, fan problems, condensate blockage, or wind pressure affecting flue operation.

You can check the external flue terminal for obvious obstructions such as leaves, debris or ice. Do not remove or interfere with boiler or flue components.

If there is no obvious external obstruction and the E7 code remains, an engineer will need to diagnose the fault.

E9 Fault Code: No Water in System / Pump Fault

The E9 fault indicates that the boiler has detected no water in the system or that water is not circulating correctly. Possible causes include low water pressure, a failed pump, or a faulty water pressure switch.

Check the system pressure and, where appropriate, restore it to the recommended level. If the fault remains, professional diagnosis may be required.

E10 Fault Code: No Flow During Venting

The Remeha Avanta E10 fault code is commonly associated with a failure of water circulation during the venting cycle. Possible causes include incorrect pump wiring, low water pressure, or air in the system.

The system pressure, pump operation and trapped air should be checked. If the E10 code keeps returning, an engineer should investigate the circulation system.

E11 Fault Code: High Airbox Temperature

The E11 error indicates that the airbox temperature is too high, associated with air leakage from the heat exchanger into the airbox. This fault requires professional investigation and repair.

E13 Fault Code: DHW Flow Switch

The Remeha E13 fault code relates to the domestic hot water flow switch, which detects when hot water is being demanded. Possible issues include a faulty DHW flow switch, a blocked or scaled heat exchanger, pump problems affecting circulation, or wiring faults to the flow switch.

If hot water flow has also reduced, scaling or another circulation problem may need to be investigated. Component testing and replacement may be required.

E43 Fault Code: Parameter Limits Error

The E43 fault is commonly associated with boiler parameters being outside their permitted limits, sometimes linked to incorrect automation settings. A professional should check and adjust the boiler settings where required.

E44 Fault Code: Parameter Check

The E44 code is commonly associated with an inconsistency in the boiler's parameter settings. Possible causes include incorrect or corrupted parameter settings. The boiler may need to be reset or professionally reprogrammed.

E45 Fault Code: Default Parameters / Faulty Control Unit

The E45 error is commonly associated with the boiler having reverted to default parameters, sometimes linked to a faulty control unit. The control unit should be tested by a professional and replaced if necessary.

If You Smell Gas

Do not attempt to work on the gas valve, ignition components or any other internal parts of the boiler yourself. If you smell gas at any point, stop immediately, do not operate light switches or naked flames, turn off the gas supply at the meter if it's safe to do so, ventilate the area, and call the National Gas Emergency Service on 0800 111 999 straight away.

When to Call a Boiler Repair Engineer

Some Remeha Avanta Plus faults can be linked to basic issues such as low pressure or trapped air. Others involve the ignition system, gas supply, PCB, sensors, pump or other internal components.

Arrange professional boiler repair if:

• The same fault code keeps returning
• The boiler repeatedly locks out
• You have no heating or hot water
• The fault involves ignition or gas supply
• An internal electrical or control component may be faulty
• Basic checks do not resolve the problem

Fault codes can sometimes point to symptoms rather than the underlying cause. For example, an ignition fault may be caused by a problem with another component rather than the ignition system itself.

If you need professional help diagnosing a Remeha boiler fault, Serviceteam provides boiler repair in London.

Preventing Remeha Avanta Plus Fault Codes

Regular boiler maintenance can help identify developing problems before they cause a breakdown.

• Annual boiler servicing and safety checks
• Monitoring system pressure
• Checking the flue and air intake
• Maintaining the condensate drain
• Bleeding and balancing radiators when required

Regular servicing can also help identify worn or faulty components before they lead to a complete loss of heating or hot water.

Remeha Avanta Plus Boiler Repair in London

If your Remeha Avanta Plus boiler continues to display a fault code after basic checks, professional diagnosis is the safest option.

Serviceteam can assess the fault, identify the underlying problem and advise whether a repair is appropriate.