Navien E060 Fault Code: Causes, Fixes & Repair Costs
What does the Navien E060 fault code mean?
The E060 fault code on Navien boilers and water heaters indicates that the unit has detected an abnormality with the dual venturi system. The dual venturi is a precision component that controls the mixture of air and gas entering the burner — getting this ratio right is essential for safe, efficient combustion. When the boiler runs its self-check routine and the dual venturi actuator motors cannot open and close the valves correctly, or when the wiring to the venturi is disconnected or damaged, the E060 code is triggered. The boiler enters lock-out mode, begins a continuous post-purge cycle, and activates the dual venturi circulation pump. On some Navien models, E060 can also relate to a fan motor fault where the fan fails to reach the required speed — always cross-reference with your specific model's service documentation. Either way, this is a lock-out fault and the boiler will not fire until the underlying issue is resolved.
General guidance only — not a substitute for professional advice, and not certified by a Gas Safe engineer. Always have your specific appliance assessed by a qualified professional. Any gas work must be carried out by a Gas Safe registered engineer. If you smell gas or suspect carbon monoxide, leave the property and call the National Gas Emergency line on 0800 111 999.
Common causes
- Disconnected or damaged wiring to the dual venturi Common
The most frequent trigger for E060 is a wiring harness that has come loose or sustained damage at the dual venturi connector. Vibration over time can work connections free, and rodents or heat can degrade cable insulation. The boiler's control board loses communication with the venturi actuator and immediately logs the fault.
- Faulty dual venturi actuator or unit Common
If the wiring checks out, the dual venturi itself may have failed. The actuator motors inside the venturi assembly are responsible for opening and closing the air/gas valves on demand. When they seize, stick, or fail electrically, the self-test detects that the valves are not responding correctly and locks the boiler out. A Gas Safe engineer can run the unit in dual venturi test mode to confirm whether the component is cycling as it should.
- Blocked or restricted air intake Sometimes
A partially blocked flue intake or dirty air filter can prevent the venturi from achieving the correct airflow conditions. When airflow is restricted — whether by debris, a bird's nest, or an improperly sized or excessively long flue run — the venturi and fan cannot perform correctly, which can generate this fault on susceptible models.
- Fan motor failure or incorrect RPM Sometimes
On certain Navien models E060 is associated with the combustion fan rather than the venturi actuator specifically. If the fan motor cannot reach the required speed, the air-to-gas ratio cannot be controlled properly and the code is raised. A technician would check the fan speed sensor, measure voltage at the motor, and test RPM against the service manual specification.
- Defective PCB or controller Rare
If the dual venturi and all associated wiring are confirmed to be in good working order, the control board itself may be sending incorrect signals or failing to interpret feedback from the venturi correctly. This is the least common root cause and is typically reached only after other components have been ruled out.
How to fix it
- Reset the boiler once or twice DIY safe
Press and hold the reset button on the boiler's front panel as described in your user manual. Allow the unit to complete its start-up sequence. If the E060 code returns immediately or after a short time, a simple reset is not going to resolve the underlying fault and further investigation by an engineer is required. Do not reset the boiler more than two or three times, as repeated failed ignition attempts can cause additional issues.
- Check that the gas supply to the property is on DIY safe
Confirm that the gas isolation valve on the pipe feeding the boiler is in the open position (handle in line with the pipe). Check that other gas appliances such as the hob are working, which rules out a wider supply interruption from your gas network operator.
- Inspect the flue terminal and air intake for obvious blockages DIY safe
Go outside and look at the flue outlet and, if accessible and visible, the air intake terminal. Clear away any leaves, debris, or bird activity from around the terminals. Do not attempt to access internal components. If the terminals look clear, report your findings to the engineer when you call.
- Have a Gas Safe engineer inspect the dual venturi wiring harness Gas Safe engineer
An engineer will remove the boiler casing, locate the wiring harness at the dual venturi, and check each connector for corrosion, looseness, or damage. Corroded pins can be cleaned and loose connectors reseated. If a cable has been chafed through, the harness section will be repaired or replaced. This is work on internal components and must only be carried out by a qualified engineer.
- Have the engineer run the dual venturi in test mode Gas Safe engineer
Navien service procedures include a dedicated dual venturi test mode accessible via the controller. A Gas Safe engineer will activate this mode and observe whether the venturi valves open and close repeatedly as expected. If they do not cycle correctly, the venturi unit itself is confirmed faulty and should be replaced with a genuine OEM part.
- Have the engineer test the fan motor speed and sensor Gas Safe engineer
If the model in question associates E060 with fan performance, the engineer will use a multimeter and the service manual's RPM specification to verify that the fan motor is reaching the correct speed. Voltage input to the motor and the integrity of the speed sensor will also be checked. A failed fan motor will need replacing.
- Replace the dual venturi or fan motor if confirmed faulty Gas Safe engineer
Once a component-level fault is confirmed, the engineer will source and fit a genuine Navien replacement part. Aftermarket components are generally not recommended on Navien systems as they can affect combustion performance and warranty status. The engineer should clear the fault and run a full functional check after any replacement.
- Replace the PCB or controller if all other components are sound Gas Safe engineer
If the wiring, dual venturi, and fan have all been verified as serviceable and E060 persists, the control board is the next suspect. PCB replacement on Navien boilers should always be carried out by a qualified engineer, as incorrect fitting or configuration can cause unsafe operation.
- Call a Gas Safe registered engineer if you have not already done so Gas Safe engineer
E060 is a lock-out fault involving the combustion air and gas control system. Beyond the basic homeowner checks above, all diagnosis and repair work must be carried out by a Gas Safe registered engineer. You can verify an engineer's registration at gasregister.co.uk before booking. When you call, mention the E060 code, your Navien model number, and any observations you have made.
Parts you may need
- Navien Dual Venturi Assembly (OEM) · from £180
- Combustion Fan Motor · from £120
- Fan Speed Sensor · from £35
- Wiring Harness / Connector Set · from £45
- Navien PCB / Controller Board · from £280
The exact spare depends on your boiler's GC number (on the data badge). Check this against the part before buying.
Typical repair cost
Expect to pay roughly £150–£500, depending on the underlying cause.
Frequently asked questions
Can I fix the Navien E060 fault myself?
The only checks a homeowner should carry out are resetting the boiler, confirming the gas supply is on, and visually inspecting the flue terminal for obvious blockages. Everything beyond that — checking the wiring harness, running the dual venturi test mode, measuring fan speed, or replacing any component — involves working inside the boiler on components that affect combustion safety. This work legally requires a Gas Safe registered engineer in the UK. Attempting it yourself could void your warranty, invalidate your home insurance, and create a genuine safety risk.
How much does it cost to repair a Navien E060 fault in the UK?
For most people, the repair falls in the range of £150 to £500 including call-out, diagnosis, and parts. A wiring issue caught early may cost little more than the engineer's call-out fee of around £90 to £150. Replacing the dual venturi unit with genuine parts and labour typically lands between £250 and £450. If the PCB or controller turns out to be the cause, that repair generally costs £300 to £600. In the rare situation where an older boiler needs a full replacement rather than a repair, UK supply-and-fit costs for a new boiler typically start around £1,800 to £2,500 for a straightforward swap.
What is the dual venturi on a Navien boiler and why does it matter?
The dual venturi is a motorised mixing component that sits between the gas valve and the burner. Its job is to blend the correct ratio of air and gas before combustion takes place. It uses small actuator motors to open and close valves in response to demand, ensuring the mixture stays within safe and efficient limits across different firing rates. If it malfunctions, the boiler cannot safely control combustion and will lock out rather than risk burning an incorrect mixture.
Is E060 always a dual venturi fault, or can it mean something else?
On models such as the NCB series, Navien's own service manual defines E060 specifically as a dual venturi wiring or component fault. However, some Navien models use the same code to flag a fan motor fault where the fan cannot reach the required RPM. In both cases the root cause sits within the combustion air system. Always note your full model number when calling an engineer — this allows them to look up the correct service documentation before arriving and come prepared with the right parts.