Other malfunctions
A situation may arise when the boiler stops heating water, that is, cold water flows from the tap when turned on. Most likely, the problem lies in the malfunction of the turbine, which does not transmit a signal to the sensor, then the flame does not ignite and, as a result, the liquid does not heat up.
The turbine cannot be repaired, it needs to be replaced so that a similar situation does not happen again with a newly installed turbine, we recommend purchasing and installing a high-quality liquid filter.
In this article, we will consider the gas boiler "Oasis" of the NZR series (available in 4 versions). The number after the abbreviation "NZR" indicates the power of this boiler. For example, the Oasis NZR 13 model has a thermal output of 13 kW.
Since all modifications have similar characteristics, we will denote their numerical expression in the range.
We have a certain residential or administrative area, which has its own dimensions. It is on them that managers of household appliances stores orient buyers when choosing a boiler. But at the same time, the features of the building or apartment are absolutely not taken into account:
- What material is the building made of? For example, private houses made of profiled timber are considered warm, and concrete "Khrushchev" in this regard cause a lot of criticism;
- how is it insulated? After all, even in urban apartments there are differences. Someone does, for example, internal insulation, glazing of a loggia or balcony;
- year of construction (applies to apartment buildings). It must be understood that in different periods there were significant differences in construction technology, and the service life reduces the quality of thermal insulation of premises. Consequently, a more powerful boiler is also needed;
- house location. It can be either “open” to all winds, or, conversely, fenced off by other houses, a forest belt, a hill, and the like. The climate in the area must also be taken into account.
Approximately the power that the boiler should have is determined at the rate of 10 kW per 100 m 2 of the room (ceilings of standard height). But if any mechanism is “driven” to the limit, then it will not work for a long time. That is why the power calculated in this way is increased by a third (the necessary margin).
If a multi-storey building is built using modern technologies, and a private one is well insulated, then you can be guided by the ratio (5 - 7) kW per 100 m 2. For old or poorly insulated buildings ("Khrushchev"), the "formula" (15 - 20) per 100 m 2 is applied.
How the Oasis boiler works
The devices of this manufacturer are double-circuit. This means that the water heater can provide not only hot water in the tap, but also heating in the room. The heating temperature is from 35 to 60 degrees, the average productivity is 10 liters per minute.
The boiler is equipped with two heat exchangers. One of them is responsible for providing water for heating batteries, the other for hot water supply (DHW). Accordingly, fuel consumption and heating waiting time are reduced in summer.
Combustion products are forced out. Closed chamber and ensure automatic and safe operation. Flame sensors, gas supply, flow sensors are installed for control. A safety valve is also provided, which is activated when the pressure rises.
Not without fault control. The equipment is equipped with a self-diagnostic system. In the event of a malfunction, the display shows an error, the meaning of which is indicated in the instructions.
Installation and connection
Boiler "Oasis" is a wall-mounted model. Unlike floor-standing appliances, it does not require boiler room equipment, it can be installed even in small rooms.
Fastening is carried out either with anchors or with large screws, since the weight of the boilers is comparable to the weight of a conventional geyser, and the dimensions are approximately the same.
The described gas boilers are produced with a closed combustion chamber. What does this mean? An air supply is required to ensure the combustion process. A device with a closed chamber in this regard is isolated from the room in which it is mounted. Air is supplied from the outside by means of a fan, which is equipped with a boiler.
Therefore, before buying an Oasis product, you need to think about installing a special coaxial chimney. For private houses, this is not a problem, but for installation in an apartment, you will need to consult a specialist. Although such models are considered safer and more environmentally friendly.
Internal arrangement of boilers Oasis
One of the characteristic features of the modifications is the presence of a closed combustion chamber. Air intake is carried out from the street, using a coaxial chimney. The products of combustion are also discharged through the pipe. This makes the operation of the boilers as safe as possible. In addition, due to the closed furnace, gas consumption is significantly reduced.
Separately, we can note the presence of two heat exchangers. This solution increases the rate of heating water for hot water supply, and also allows the device to be started in summer mode, which increases its efficiency.
All wall-mounted double-circuit gas heating boilers Oasis have a high degree of autonomy, achieved thanks to the internal device, including:
- Burner
- a blower type device is used. The connected burner is automatically controlled. Electric ignition provided. The burner is equipped with photo sensors that monitor the presence of gas. After a power outage, the gas supply to the burner is blocked. A coaxial chimney is used for the boiler. It simultaneously takes in air and removes combustion products. Not included in the basic package. -
Security group
— 2-circuit hinged gas heating boiler Oasis has a multi-level protection that prevents spontaneous combustion and the occurrence of explosive situations. Provided: water flow sensor - controls the pressure of water supply and heating systems, blocks operation in case of a drop to critical levels. Relief valves are installed to help in case of overheating of the coolant. When the room temperature drops, the anti-freeze system is activated, maintaining the minimum heating of the heating system.
Oasis boilers have passed certification and received a permit for operation by Rostekhnadzor. This made it possible to operate equipment from a Chinese manufacturer throughout the Russian Federation.
What to focus on the operation
Boiler piping
- in the internal structure of the boiler there is a circulation pump and an expansion tank. During installation, you will need to additionally install a filtration system. Automation is sensitive to voltage drops, which is one of the main disadvantages of the Oasis boiler. To eliminate a possible failure of the control board, you must connect the UPS.
big noise
— The forced draft burner is very noisy. Noisiness requires the installation of the boiler in a separate room. The specifications declared by the manufacturer are somewhat different in this respect from what actually happens.
Especially noisy when turning on the hot water supply.
coaxial chimney
- it is extremely important to comply with the requirements associated with installation, strictly adhere to the maximum height, angle of inclination and other parameters. Productivity and work efficiency ultimately depend on a quality installation.
Chinese doesn't mean bad
All components from the closed combustion chamber to the temperature sensor are checked for quality and compliance with standards. The only condition for trouble-free operation is the installation and operation of the boiler in accordance with all the rules and in accordance with the manufacturer's recommendations.
The Oasis gas boiler can only run on natural gas, it is impossible to reconfigure it to liquefied gas, respectively, it can be installed in rooms connected to the central gas main.
These devices are double-circuit, designed for heating the room and supplying it with hot water for domestic needs. The liquid heating temperature ranges from 35-60 degrees, the throughput of hot water supply is 10 liters per minute.
Equipped with a closed type combustion chamber, which significantly reduces gas consumption. The operation of the burner is controlled by automation, it has photo sensors that control the presence of gas. A coaxial chimney is used for smoke removal, the air necessary for the combustion process comes from the street.
The design provides for two heat exchangers, one for the heating circuit, the second for heating the DHW liquid. Due to this, the liquid heating time is reduced, and it is also possible to use the boiler in the summer.
It is possible to connect to a room thermostat, which is not included in the package, it must be purchased separately. For safe operation, there are relief valves that operate if the coolant temperature exceeds the permissible limits. Also, for safe operation, there are flow sensors that control the pressure in the heating circuit, in case of non-compliance with the standards, the system is blocked.
Main malfunctions
What should I do if the scoreboard shows an error? How to fix the situation? First you need to decipher the meaning of the symbols on the screen, and only after that start looking for a breakdown.
Error codes and solutions
Consider what the symbols that the boiler shows mean.
E1
— Ignition problems, no ignition. What could be the reason:
-
No fuel supply
. Turn the shut-off valve, it may not be fully open. In case of strong or weak pressure in the gas line, contact the repair service; -
Weakened, clogged contacts
. Check the connections from the control module to the ignition unit. Pull up the wire. If the contacts are oxidized, clean them and reconnect; -
Faulty control board
. Diagnosis and replacement is best left to a specialist. But you can inspect the part yourself, look for burnouts and damage.
Ignition electrode does not work
. This happens if the part has shifted and is far from the burner. Remove the casing, inspect the elements and return the electrode to its place. Additionally, clean it with a metal brush. If the burner does not ignite after this, install a new electrode.
E2
- the fan has been running for 8 seconds, but the pressure switch does not close. What does it mean:
no traction
. Clogged pipe or chimney. To check, light a match and bring it to the control window. The flame deviated to the side - there is thrust, it burns evenly - no. You can bring a sheet of paper to the ventilation hole. With normal traction, it will tighten, and if the passage is clogged, the sheet will fall.
In this case, you need to clean the chimney from your side, and call the public utilities to clean it from the street. Open the combustion chamber. You will see that there are two tubes connected to the manostat (pressure regulator), which also need to be cleaned;
-
Broken air relay
. You can verify the malfunction of the part using a tester; -
Fan does not work
. The item is inspected for damage. Tubes are held to it, which could melt and need to be replaced. Then start the boiler and close the contacts of the manostat. If the burner lights up, the manostat is broken, if not, the main unit. -
Electronics problems
. Perhaps the wiring contacts have come off, the insulation is broken. All elements are inspected and tightened.
E3 -
The inlet DHW temperature sensor has failed. Diagnose the sensor and wiring. Replace defective parts.
E4 -
broken DHW output sensor. Proceed in the same way as in the case of E3.
E5 -
heating sensor does not work. Similar actions.
E6
- there is no flame. What to do:
-
Restart
. To do this, open and close the mixer several times until ignition occurs. It is likely that air has accumulated inside, which prevents normal ignition; -
Pull the pins to the connectors
, make sure the integrity of the insulation.
E7
- Low line pressure. What could be causing the problem:
-
Too little water
. It is possible that one of the connections has begun to leak. Apply a dry cloth to the joints to check for leaks. Seal the connection, tighten the nuts more tightly and eliminate the leak; -
Incorrect pressure is set in the distribution tank.
It is necessary to adjust the settings as indicated in the instructions for a particular model. As the liquid heats up, it expands, causing the pressure to rise. Because of this, the safety valve works and dumps excess water.
E8 -
water overheats. What is the reason:
-
Heating valve closed
, you need to open it; -
Hot water or heating systems overheat
. Diagnose the operation of the bypass valve, as well as the degree of flow of hot liquid.
E9 -
system pressure is not correct. The pump is broken, so the burner may not ignite.
-
Line pressure
must be at least 0.1–0.15 bar; -
Remove the pump.
Clean its parts from blockage, rinse under running water. Inspect the elements for damage, especially the blades.
Faulty thermal sensor
. Diagnose and replace.
We examined all the errors typical for Oasis gas boilers. In addition, users are faced with such a malfunction as a lack of heating: when the mixer is opened, there is no hot flow. This indicates a turbine failure. It cannot be repaired, it is better to install a new one.
Shut off the gas and water supply before starting work on the equipment. If the error code does not disappear from the screen after all the efforts made, contact a specialist. Do not carry out independent work with the gas line - it is dangerous and can lead to an accident.
conclusions
Let's summarize all of the above:
- The Oasis gas boiler is perfect for any city apartment or a small private house connected to a gas main. It is advisable to use it for small industrial or administrative buildings;
- Provides both heat and hot water;
- "Oasis" can be installed even in a small, non-separate room;
- Installation of a coaxial type chimney is required. When connected to a common house smoke exhaust system, the boiler must be provided with a separate air supply.
It should be added that the manufacturer gives a 2-year warranty for their products.
Boilers of the company "Forte Technologie & Produktion GmbH" relatively recently appeared on the market of heating equipment. Positioning itself as a large international corporation created by German investors, Forte has occupied a niche in the production and sale of bimetallic radiators. In order to expand the sales market, a step was taken to produce
.
Currently, the model range is represented by one type of gas equipment - the Oasis NZR boiler. In order to increase the number of potential buyers, 4 main modifications of this boiler were made.
The double-circuit gas boiler Oasis NZR is designed to heat the coolant in the heating system and to provide hot running water. Its general characteristics allow it to be used as the main heating device in both private homes and small office buildings.
4 models of the boiler have been developed, which differ in rated power - from 13 to 24 kW. The marketing strategy of the company allowed boilers with a small capacity to confidently occupy their market segment.The relative shortage of low-cost and low-power boilers has become a niche that allows Forte to continue its successful promotion in the market.
Specifications
All models of Oasis boilers are wall-mounted and have the technical characteristics presented in the table:
Technical characteristics of boilers Oasis NZR
Like every type of heating equipment, these boilers have some characteristic design features:
- Closed combustion chamber. The air flow to maintain the combustion process occurs with the help of a fan. To implement this process, a coaxial chimney is provided, consisting of two air ducts - a pipe in a pipe. One (external) provides air flow from the street, and the second (internal) - removes the products of gas combustion to the street.
- The heat exchanger is made of copper, which increases its functional properties.
- Convenient management. The process of adjusting and controlling the water temperature, both in the heating system and in hot water supply, is carried out using an electronic panel.
- Power modulation with electronic .
- Extended boiler operation protection system for the following cases:
- Water overheating.
- Critical decrease (increase) in pressure in the water supply system.
- Automatic restart in case of water stagnation.
- Protection of the electronic filling when the voltage drops.
- Prevention of water freezing in 2 systems.
- The presence of a draft sensor to control the process of removing combustion products.
Ionization control of the burner flame.
But the main criterion for our citizens is the cost. It is thanks to a well-thought-out pricing policy that sales of these boilers are growing every year.
However, it is worth noting that in addition to positive factors, there is some negative, which can be characterized by the phrase - not a very good quality. Of course, this does not apply to all products.
For a modern person, one of the main criteria for choosing a particular product is customer reviews.
There are several important points to consider when choosing heating equipment for your apartment or private house. The gas boiler must meet the requirements - to be reliable, productive, have economical fuel consumption, easy to manage and easy to operate. The Oasis gas wall-mounted boiler fully meets all consumer expectations.
