Navien boilers are modern heating equipment equipped with automation and a protection system. Sensors for detecting problems of varying levels of complexity allow the user to eliminate many minor problems on their own, without resorting to the services of a service center. The accompanying instructions contain codes that characterize a particular problem in the operation of the boiler. Based on this list, the user can easily find information on solving many problems. In this material we will analyze error 03 and tell you how to fix it.
It is important to mention that for high-quality and long-term operation of the equipment, it is necessary to adhere to the universal rules for operating high-tech devices:
- Responsible approach to equipment installation, carried out in strict accordance with the instructions.
- Using high-quality components and materials that will ensure uninterrupted operation of the equipment for a long time.
- It is important to carry out preventive maintenance of equipment (inspection and cleaning of components).
- Do not forget to check the readiness of the equipment for operation (gas supply, sensor condition, water supply).
By observing these conditions, you can avoid rapid wear of equipment and frequent breakdowns.
The Korean company strives to minimize information on user intervention in fixing problems. This is caused by the manufacturer’s concern for the safety of customers who may make mistakes in fixing a technical problem and thereby harm themselves and their loved ones.
It is important to remember that Navien boilers are complex and explosive equipment. Therefore, troubleshooting on your own must be done with the utmost care, following the clear instructions of specialists.
Fault 03
Each malfunction characterizes a specific problem in the operation of the equipment. So error 03 on the Navien boiler model Deluxe Coaxial 16K indicates that the device has problems igniting the gas burner or gas is not supplied to the burner. This article will discuss fault diagnosis and repair.
If the Navien boiler gives error 03, you need to check the presence of gas in the house, and also whether the gas supply tap located near the boiler is open. Only after you are convinced that the cause of the error is a malfunction, should you start diagnosing the equipment.
Gas boiler Navien, main faults and their elimination
Do-it-yourself repairs require certain knowledge and skills in working with gas equipment. There is a special manual that describes the main fault codes. There are no repair instructions provided for users. The manufacturer assumes that troubleshooting will be carried out exclusively by service centers.
Read more ⇒ Procedure for checking gas equipment
But many breakdowns can be fixed on your own without wasting time and money on a professional technician. To do this, it is enough to familiarize yourself with the main malfunctions and their elimination.
Navien gas boiler does not start
If the system does not turn on the control panel, then the problem is usually a lack of power from the electrical network. If the power supply is turned off by utilities, you should wait until the supply is restored. To understand how to turn on the equipment, just plug the cord into an outlet.
A common problem is the gas boiler turning on and off frequently.
Read more: Why does a gas boiler go out? Main reasons
The source of the malfunction is an incorrectly installed circulation pump. The heating often turns off when the temperature range is incorrect. Also, the equipment turns on and off every 5-7 minutes in the absence of a thermostat.
The Navien boiler does not reach the set temperature
The most common malfunction of a Navien gas boiler is that the system does not heat up to the specified parameters. To fix the problem, you need to clean the heat exchanger using household plumbing chemicals or specialized compounds. To do this, the device is dismantled, the selected solution is poured into it, after which the part is thoroughly washed with a large amount of water. If the boiler does not heat hot water, then you can clean the heat exchanger of the DHW circuit in the same way.
The Navien boiler quickly gains and drops temperature
If the Navien gas boiler quickly heats up and cools down, then the fault should be sought in the heating system. You can adjust the pump speed to force fluid movement or remove air pockets.
During diagnostics, it is necessary to inspect the filtration system and the lumen of the heat exchanger. You may also need to replace the antifreeze. Spare parts for Navien gas boilers are freely available - they can be ordered online or purchased in a specialized store.
What to do if the boiler is humming
Navien ace 16k, 13 and other models hum when the heat exchanger is dirty. To fix the problem, you need to remove the device and clean it. A frequent failure occurs when a gas boiler bangs when ignited. The cause of the malfunction is late ignition of the gas. To get rid of the loud sound, you need to clean the burner or increase the ignition gap.
Malfunction of the boiler ventilation system
If you do not use Navien Deluxe floor or wall heating equipment for a long time, a lot of dust accumulates inside, which negatively affects the operation of the fan. To fix the problem, you will need to clean and lubricate the system.
Control board malfunctions
The control board often causes boiler malfunction. The difficulty with such a failure is that it is difficult to determine on your own, so it is better to contact a professional repairman. To prevent the problem, it is necessary to install a voltage stabilizer in the power supply circuit of the heating equipment.
Water oversaturated with oxygen
During natural circulation, water bubbles form, which burst and cause noisy operation of Navien Ice 24 and other models. If you add membranes to the system, the problem will disappear.
Hard water sediment
Scale accumulates on the walls of the heat exchanger of a wall-mounted or floor heating device, gradually narrowing the passages for water supply, so a strange hum appears when the Navien ace 24 k or deluxe 16k is operating. To get rid of the malfunction, you need to wash all parts with an acid solution.
What to do if the aspirated air leaks
In Navien ace gas boilers, leaks are caused by a breakdown of the heat exchanger. You can try to solder the fistula or buy a new device.
Pressure failures
Failures in water pressure of Navien heating devices are usually associated with leaks. The coolant penetrates into all small cracks, which affects the operation of the equipment. Also, the reasons include a malfunction of the three-way valve or secondary heat exchanger.
Why does the pressure drop, what should it be, setting the pressure
If the water pressure in the system drops, this indicates a leak in the boiler, pipes or batteries. To fix the problem, you need to open the valve, turn on the heating equipment and carefully inspect each element of the system.
Read right now:⇒ How to find and fix a leak in your heating system
When searching for a possible malfunction, focus on the intensity of the pressure drop. Liquid may enter the expansion tank where the membrane is damaged. The cause is often a worn safety valve. The only way to increase the pressure is to find and fix the leak and replace damaged parts.
Pressure jumps in the heating system
When the pressure in the heating system fluctuates, you need to look for the cause in the three-way valve. Antifreeze penetrates the heating circuit, thereby raising the indicator. In this case, replacement or repair of the three-way valve of the Navien gas boiler is required.
Why is blood pressure rising?
The source of the problem, why the pressure in the Navien gas boiler increases, lies in the secondary heat exchanger. The safety valve reacts first. The hot liquid is heated by the already hot heating system. Antifreezes do not mix, but simply exchange heat.
But when a fistula occurs, water from the hot water supply enters the heating system and the pressure begins to rise to match the indicators of household liquid. To get rid of the problem, you will have to replace the heat exchange device. Repairing this element for a Navien gas boiler is difficult and economically unprofitable.
Diagnosis of the error
Let's diagnose and fix this problem. If this blockage occurs, you must try to restart the boiler. To do this, press the “power on” button on the remote control. Re-ignition is in progress. If error 03 occurs again, so now you need to:
- turn off the boiler;
- turn off its power supply;
- close the gas supply valve.
Let's remove the front panel. For these purposes you will need a Phillips screwdriver. It is necessary to unscrew two self-tapping screws located at the bottom of the boiler. And then unclip the two latches on top and remove the lid from the boiler. When a problem arises with igniting a gas burner, first of all, it is necessary to check what gas pressure is present in front of the boiler, and then the operation of the ignition electrodes. Check for spark.
Useful tips
- The instructions for Navien gas boilers note the stability of their operation when the supply voltage is unstable, hence the minimal list of errors.
This is ensured by the presence of a security chip in the microprocessor - one of the features of Navien models. But what to do if there is an emergency on the line? For objects located in rural areas, the question is far from idle. Experts recommend turning on the heating unit via a UPS. The unit contains a stabilization circuit, a group of batteries, and a charger. In the event of a power line break, problems at a substation, or with starting a backup generator, an autonomous source will ensure stable, continuous operation of the Navien boiler for several hours (the period is determined by the total capacity of the battery).
- When contacting a specialized organization, you need to clarify whether it is certified by the Navien boiler manufacturer. Otherwise, you will have to face a number of problems, and eliminating error 03 will be expensive. “Simply Workshop” pays for spare parts like everyone else: in retail outlets, via the Internet. And this is time and extra money. As for detailed instructions for testing and troubleshooting Navien boilers, the manufacturer supplies them only to its service centers. This means that specialists from a third-party organization will not be able to do the work really well.
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Checking the operation of the ignition electrodes
At the next stage, we will check for the presence of a spark at the ignition electrodes. Using a Phillips screwdriver, you need to unscrew the two screws that secure the electrode block in the combustion chamber. And then carefully remove the electrodes and pull them out of the boiler firebox. Let's connect the power supply and put the boiler into operation. The pump starts up, the fan turns on, we hear the gas valve closing the coils open, but ignition does not occur. No spark. I'm guessing the problem is with the ignition transformer. It requires replacement. Let's turn off the boiler and turn off its power supply.
Check if the spark plug produces a spark
Thermocouple
This device is one of the few that can measure high temperature. It is both simple and yet reliable. A thermocouple is made of two wires of different metals that are connected at different points. All this makes it possible to use it for different purposes. The main disadvantage is the error of one degree. To ordinary people this seems insignificant. But for such devices, many consider such indicators to be simply gigantic.
The device is used as a fuse. It measures the temperature in the heating pad. If it starts to fall quickly (say, for some reason the fire goes out or there are problems with the smoke exhaust), the system is triggered, which sends a signal to the solenoid valve and the gas supply stops. Therefore, if this component does not work, the equipment is inoperative.
Sequence of actions for checking:
- The thermocouple has two ends, the first of which is heated by the igniter, and the second is attached to the solenoid valve. It is necessary to separate the device from the boiler, be it a regular one or a condensing one with a three-way valve.
- Then provide a constant flame. A candle is best.
- Heat the tip above the flame at a distance of 1 cm. Just be careful, as the heat can reach half of the body.
- We take the tester and turn it on to millivolts. One probe is placed on the body, and the second on the output contact.
- After half a minute, a working thermocouple will show the EMF in the range from 17 to 25 mV. If the indicators are normal, then the problem of a non-working system may be elsewhere.
Repair
To remove the transformer, you must:
- disconnect the connector by pressing the lock;
- Carefully remove the ignition electrodes.
Connection occurs in reverse order:
- first the electrodes are connected;
- then the connector is fixed.
Now you can reconnect the power supply and turn on the boiler in operating mode. The pump turned on, the fan started and a spark occurred.
Turn off the boiler again and turn off the power supply. We connect the electrodes to the boiler firebox. It is important to do this very carefully so as not to damage the gasket.
Solenoid valve
The solenoid valve is a shut-off valve that directly affects the safety of the unit. It is mainly installed so that in the event of a problem, it closes the fuel supply. Emergency situations in the operation of gas heating can occur due to various factors:
- drop in fuel pressure;
- lack of fluid in the system (you can check the joints, three-way valve and pipes);
- worsening traction;
- gas leak.
Each of the problems described above is dangerous to human life, and therefore further operation of the system is unacceptable. This is why the solenoid valve is activated. Its initial position is open. To close it, an electrical impulse is applied to it, coming from a thermocouple installed above the flame in the combustion chamber or on the chimney.
It must be said right away that this element rarely fails, since it has great potential for use. Despite this, moments still happen.
There are two ways to check the functionality of this valve:
- Fire. The used thermocouple is replaced with a new one. The automatic button turns on. Next, the igniter is ignited and the fire is brought to the end of the thermocouple. In this case, the automation should work.
- Instrumental. The sensor is removed from the housing and a repair contact is inserted. It is supplied with voltage from 3 to 6V. If the solenoid valve is in order, the automation will work. Otherwise, you need to replace this element.
03E – no burner flame.
Check
- Condition of shut-off valves. The Navien error can be caused by user inattention - the valve blocks the pipe.
- Shut-off valve lever position. When it is triggered, the gas supply channel is blocked and the boiler stops; this can also happen in the absence of the owners.
If in fact there is a flame, the cause of the error is the ionization sensor: contamination of the electrode or its incorrect position, damage to the signal line, short circuit.
02E
Pressure drop in the heating system. The error indicates a leak in the circuit, the boiler itself or installed devices (hydraulic accumulator, filters).
Check
- No puddles on the floor. Particular attention is paid to the joints.
- Circulation pump. Deformation of the blades and their damage affect the speed of fluid movement, hence the error on the boiler display.
Navien circulation pump
