The hydrosta gas boiler does not heat the water. The boiler does not heat water

Water heaters are used as the main or additional source of hot water supply in apartments and country houses. A complex device can fail for various reasons, breakdowns cause a lot of domestic inconvenience and require urgent elimination. Let us consider in more detail why cold water does not enter the water heater, for what reason the pressure may decrease and why there are difficulties with heating.

Water heater

Why the water heater does not work

First of all, you need to figure out the cause of the problem. Most often, the owners of water heating equipment are faced with the following malfunctions:

• The water pressure at the outlet of the water heating equipment decreases.
• The boiler collects water and heats it, but there is no water at the outlet.
• Water does not enter the boiler tank.

A boiler is a complex system consisting of many pipes of various diameters, filters, valves and valves. Failure of any unit can lead to malfunction of the entire system.

Boiler design

Here are the main causes of malfunctions:

• Precipitation of insoluble carbonate salts (scale) on pipe walls, valve parts or valves.
• Ingress of rust particles.
• Blocking the flow of water by an air bubble.
• Failure of a valve or valve (jamming of parts).

First of all, you need to find the problem node. To do this, sequentially disconnect the parts from the inlet and see after which unit the water stops flowing into the system. When problem area will be found, you can start repairing.

Important! Any actions related to opening the casing of the water heater will void the right to warranty service. Only proceed to work if the warranty has expired. Otherwise, it is advisable not to violate the warranty rules, but to contact the service center.

Trouble-shooting

Having found the problem node, you need to start restoring the boiler's performance. The procedure depends on the specific reason that prevents the normal operation of the device. Let's consider the most common situations.

Limescale clogging

Scale clogging up the water heater

Scale is deposits of insoluble carbonate salts on the walls of water heating devices. She is found in teapots washing machines, water heaters.

The amount of lime scale depends on the hardness of the water. In regions with hard water, even after a year of boiler operation, the amount of salts deposited on the walls may be enough to completely block the lumen of the heating element tubes or significantly narrow it.

If scale has caused the water heater to fail, repairs need to be carried out in the following order:

• Open and remove the protective cover from the water heater.
• Unscrew the nuts holding the heating element in place and remove it.

Dismantling the heating element

• Wash the walls of the boiler and the heating element coil from carbonate deposits. Organic acid - lemon or oxalic acid - will help dissolve the hard crust. You can also use industrial means - antiscale. Soak the part in an acidic solution to loosen any accumulated deposits.

Cleaning the heating element from scale

• Using a tester, make sure that the heating element coil has not burned out due to a violation of heat dissipation by scale.
• If the coil is intact, assemble the device in the reverse order of dismantling.

If the heating element is out of order, you will have to look for a new one or buy a new boiler - you need to choose the most economical solution. If repairs require large financial costs, it is more profitable to immediately purchase new equipment.

Failure of the pressure reducer

The pressure drops of the incoming water in the system can be from 2.5 to 7 atm. To compensate for surges, a special unit is installed at the boiler inlet - a reducer. Its task is to ensure equal pressure at the outlet from the boiler and from the tap. If it fell due to the failure of the gearbox, it is necessary to adjust its operation or replace the broken part.

Low pressure in the main water supply also leads to a drop in pressure at the outlet of the water heating boiler or in instantaneous water heater... Unscrew the hose and check the pressure level: if water comes from the main water supply in a thin stream or does not come at all, it is worth waiting out, as the problem may arise due to renovation works... If the pressure has not recovered within a few hours, it is worth contacting Vodokanal.

Broken thermostat

If the water leaving the boiler does not heat up enough or does not heat up at all, the reason may be the failure of the thermostat - it is he who is responsible for maintaining constantly high temperature... To carry out diagnostics, turn off the power to the boiler and remove the thermostat from the housing.

• Press the thermostat button.
• Heat the copper tip of the thermostat. If the node is healthy, the button should be disabled.
• Ring the electrical circuits of the thermostat with a tester.

Typically, a thermostat malfunction is caused by an overheating protection trip. As a result of the operations carried out, the device should work, and the malfunctions will disappear after it is installed in place. If the tester shows an open circuit, you will have to replace the burned out thermostat.

Mixer clogged

If water comes out of the boiler with sufficient pressure, but runs slowly from the tap, the reason lies in the faucet clogging with scale or rust. You will need to turn off the water, disassemble the mixers and thoroughly clean the filter mesh. You should also inspect all rubber seals to ensure that the crane trailers are working properly.

If water does not flow into the boiler

If the described causes are eliminated, the water pressure is present, and the boiler still cannot be filled, the reason may be incorrect connection (inlet and outlet pipes are mixed up) or clogging of the mesh filter pad. Fixing these problems is easy: unscrew the hoses, rinse the filter and put everything back in the correct order.

Water heater operation diagram

Another reason for the malfunction is a breakdown. check valve... It is installed at the entrance to storage tank and prevents water from returning to the water supply. It can also relieve excessive pressure when it overheats. Over time, the valve spring becomes clogged with scale and rust particles, causing the valve to jam. Disassembly and thorough cleaning will help eliminate the problem. If it was not possible to clean the part and restore its performance, you will have to look for a replacement.

Having figured out why the boiler can stop working normally and how to eliminate the most common malfunctions, it is worth dwelling on preventive measures.

Most breakdowns can be avoided by performing simple recommendations for care:

• Do not overheat the water. Less temperature - the slower the formation of scale, leading to breakdowns.
• Many boilers are designed to use softening cartridges. Do not skimp on water softening, as this will help avoid repair costs.
• When leaving for a few days, turn off the device without draining the water. But turning it off at night to save energy is impractical due to the high wear and tear of the electrical part.

Installing a gas boiler allows you to forget about cold water in radiators and taps. Double-circuit models are capable of simultaneously working for heating and hot water supply (DHW) of the room. But what if the boiler does not heat the water? If you are faced with a similar problem, our recommendations will help you find the cause and fix the problem yourself.

Boiler working principle

To understand the reasons for the breakdown, you need to understand how the boiler works. Double-circuit devices "Ariston", "Baksi" and other models have several blocks. Ignition and combustion take place in the gas unit, the water unit is responsible for the water supply and the pressure in the line. The chimney unit removes the combustion products outside.

As soon as you start the boiler, the pump is activated, which pumps water into the system. The gas valve opens. The liquid circulates through the tubes of the heat exchanger, and the burner evenly heats up its body. Sensors monitor the heating process. As soon as the temperature reaches the set one, the gas supply is turned off, heating stops.

When the temperature starts to decrease, the sensors will send a signal to the control unit - the heating cycle will start again.

When the mixer is opened, the flow sensor is triggered. It gives a signal to the board to switch the three-way valve to DHW heating. When the mixer is closed, the valve switches to the heating system. Some models are equipped with a "quick start" mode. Then the valve periodically switches, heats up both the first and second heat exchangers.

Why the boiler does not heat well, does not pick up the temperature

No hot water? For what reasons does the technique not work? Sometimes it's about external factors. Let's take a closer look.

The appliance works, but does not heat up or heats up weakly

Airlock. Check for trapped air in the batteries. Remove excess air using taps. If you do not have an air vent on the radiators, then you need to install it. By adjusting its faucet, you can release the accumulated air in the system.

Also inspect the valve for blockage. Most often it gets clogged with scale.

Clogged radiators... After cooling down, drain the water from the pipes. If it is heavily dirty, run it over the batteries until a clean one flows.

Wrong connection... If there is no hot flow, make sure that the pipe diameters correspond to those stated in the instructions. Are the hoses connected correctly, shut-off valves installed.

Low line pressure... It is not enough to open the valve and ignite the burner. Top up with water.

Scale build-up in the heat exchanger. You can see that the technology heats up the liquid for a long time, the batteries are not very hot. Clean deposits from the radiator pipes. For this, it is better to remove the node, but this can not be done in all models. Therefore, remove the cover, disconnect the device from gas and water. Connect the pipes from the pump to the heat exchanger, run the cleaning liquid through the system. Special means can be picked up in the store. Then rinse the parts under running water.

The addition of reagents to the heat transfer fluid helps to reduce the formation of salts on parts.

When buying, it is important to pay attention to the brand and model of the boiler. For example, manufacturers "", "", "", "", "" prohibit the use of the reagent. It is recommended to install cleaning filters or use distilled water.

Antifreeze can be applied to models, "", "", "", "", "". But a separate reagent is produced for each manufacturer.

Clogged filter... Another reason for poor heating of the batteries. The mesh filter is clogged with small debris, so it is periodically removed and cleaned under running water. In case of severe clogging or wear, it is better to replace the part.

Incorrect adjustment... Check the set values ​​on the panel. Possibly chosen too low temperature therefore the gas does not heat hot water.

Problems with the operation of the circulation pump... Overheating, the pump turns off when hot water is turned on. Its capacity may not be sufficient for normal circulation. Adjust the settings.

Battery design does not fit your equipment... Each design has its own permeability and heat transfer. The wrong choice leads to a decrease in heating due to the patency of the system.

Failure to comply with the slope of the highway... The problem is typical for systems with natural circulation, which is ensured by compliance with installation standards. According to the documents, the slope of the pipes for each running meter must be at least 10 mm. No slope - no heating. The coolant stagnates, the batteries remain cold.

The gas boiler does not turn on, does not provide hot water for DHW

The main cause of malfunction is salt deposits... The larger the scale layer in the heat exchanger, the worse the conductivity. The water heats up for a long time, a thin, slightly warm stream flows at the exit. Also, a piece of scale could chip off and block the passage to the mixer. We have described above what to do in this situation.

Flow sensor problems... The part works on the principle of a fan that rotates due to the movement of the flow. The sensor may not work if it is clogged. For cleaning without dismantling, open and close the tap located near the circulation pump.

If the procedure does not help restore operation, you will have to remove the sensor, clean it and reinstall it.

Three-way valve malfunction... If the valve is stuck or broken, it will not be possible to switch the water supply from the heating system to DHW. The cause of the problem could be a clogged part, gas hose or filter. Clean all items.

There are many reasons for malfunctions. The symptoms we described will help determine what problem has occurred in your circuit. Pay attention to the operation of the technique and compare with the indicated problems. If you cannot eliminate the problem yourself, contact a specialist.

Good evening everyone! After 4 months of operation of the Baksi double-circuit gas boiler, it stopped heating hot water. Why? What is the reason? I suppose that the boiler is running on untreated water and, possibly, "overgrown" with scale or rust. What will you advise the Lord?

NURLAN_DRAGON 2015.06.21 06:21 0

User responses:
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The most common reason breakdowns of boilers, it is scale. Most likely, your boiler heat exchanger is clogged with scale and therefore does not heat. Solution - install special. filters. For example, magnetic or electromagnetic. They are installed in front of boilers and operate for many years without requiring maintenance. See manufacturers Kema (Moscow) or Aquashit (Ufa). Good luck!

Yes, most likely your double-circuit boiler is covered with scale. That is why he stopped heating hot water! Why? Hard water! What to do? Install the filter. For example, ion exchange or electromagnetic.

OBSERVATION 2015.06.21 12:26 PM 0

User responses:
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I can't even imagine such a thing. I alone would be bored, to be nailed to any dubious companies

Vailant and Baksi boilers are particularly reliable and safe. Breakdowns of such complex equipment should be eliminated by a master. But, minor faults can be removed on your own if you have a basic level of knowledge about the design of heating and heating gas double-circuit boilers Baxi, Aristan or Nayen. On the display of the Baksi double-circuit gas boiler, most of the faults are indicated. With the interpretation of the errors, you will be able to figure out what is the reason for the failure of the boiler to heat the water. Where to start the search if the heating of water in a double-circuit gas boiler Baksi or Vilant does not work, and the indicator does not show an error, or it can be interpreted in different ways? The gas boiler does not heat hot water. Why? Cause? Double-circuit boiler Baxi (baxi). If the Vilant, Baksi, Aristan or Navien double-circuit gas boiler does not heat hot water, the secondary heat exchanger should be checked. It also tends to clog up quickly. But, fortunately, it can be easily removed, cleaned and installed back. What is the reason? Why is this happening?

Vailant boilers are particularly reliable and safe. Breakdowns of such complex equipment should be eliminated by a master. But, minor faults can be removed on your own if you have a basic level of knowledge about the design of heating and heating boilers.

Most of the faults are indicated on the boiler display. With the interpretation of the errors, you will be able to figure out what is the reason for the failure of the boiler to heat the water. Where to start the search if the water heating in the Vilant boiler does not work, and the indicator does not show an error, or it can be interpreted in different ways?

The Vilant boiler does not heat hot water due to blockages

This is one of the most common problems. Most often, the reason lies in the low quality of water - scale appears, units, filters and pipes become clogged.

If the boiler does not ignite a flame, start the check from the flow sensor. Finding this cylindrical device is quite simple. The flow sensor is located near the pump, it is to it that the wires fit. Two sensors are installed near the pump:

• Pressure sensor in the heating system.
• Flow sensor.

The flow sensor looks like a small fan; it starts to rotate from the movement of water through the pipes. If the flow sensor detects the movement of water, the automation receives a signal about the need to turn on the gas and heat the water. If the flow sensor is clogged, water will flow, but the fan will not move. Accordingly, there is no signal to turn on heating. There are two ways to solve the problem:

• Do not rush to disassemble the boiler and try to “blow through” the system first. Shut off the house water valve. Open the hot water tap and drain the water from the system. Now the percentage of air in the pipes has increased. Start abruptly opening and closing the water tap directly in front of the boiler. These simple manipulations will help to create pressure and clean the debris from the fan of the duct sensor.
• If “purging” does not solve the problem, it is necessary to open the boiler, unscrew the flow sensor and clean it manually.

If the Vilant boiler does not heat hot water, the secondary heat exchanger should be checked. It also tends to clog up quickly. But, fortunately, it can be easily removed, cleaned and installed back.

A clogged three-way valve can also cause the boiler to fail to heat water. And you can remove this unit yourself, clean it and install it back.

Having bought the Vilant boiler, be sure to check with the seller information about the places where the filters are installed. You can clean and change these components yourself.

Defective pump

Heating water in the Vilant boiler largely depends on the operation of the pump. It is necessary to call a specialist to repair or replace this unit. But, you can independently check whether it is the reason for the failure of the boiler to work.

Set the water temperature on the boiler to 0 ° C and turn on the water heating mode. During this time, monitor the operation of the pump. If after 20 minutes of operation it does not heat up, then the problem is with the pump.

The reason for the failure of the boiler to heat the water may lie in the elementary unscrewing of the bolts in the connection areas. Carefully examine the diagram of the boiler device and check if all connections are tight. Perhaps a simple tightening of the bolts will solve your problem.

During the operation of a double-circuit gas boiler, each user will encounter certain problems associated with the operation of the hot water supply circuit. These problems are inevitable. They always appear, regardless of the manufacturer of the boiler and its heat exchanger, on the design features of the boiler; it does not matter whether the boiler is wall-mounted or floor-standing. Often the boiler starts to heat hot water poorly or does not heat it at all. Especially when you are using multiple points at the same time. Let's talk in this article on how to get rid of this problem forever.

In any room where a double-circuit gas boiler is installed, be it an apartment, Vacation home or office, there are certainly several places that are points water intake: washbasin in the toilet, shower in the bathroom, sink in the kitchen. All these points are connected to the hot water circuit of the boiler.

What happens when hot water is turned on at one point of the intake

The double-circuit boiler is set to maintain a certain temperature in the hot water supply circuit. When you turn on hot water at one of the points:

• for some time, cold water continues to flow from the tap, which was in the pipe before it was opened,
• the boiler is heated, and it takes a certain time for it to reach the set temperature,
• after a few seconds, the heated water enters the pipe and begins to move to the point of intake,
• a few more seconds are needed for hot water to reach the intake point,
• an additional few seconds are necessary due to the fact that the incoming water seems too hot to the consumer, and he regulates the water supply with the mixer.

Thus, at least a few seconds elapse from the moment the hot water tap is opened until the moment the water at a comfortable temperature begins to be dispensed. The further the water intake point is from the boiler, the longer this period of time.

All this time, the user cannot fully use the water and it will be that the boiler does not normally heat hot water. He waits for the moment the water arrives at a comfortable temperature. Meanwhile, the water, which is not at a comfortable temperature for the user, simply goes down the drain.

Unproductive water consumption can range from several liters to ten liters, depending on how far the water intake point is from the boiler.

What happens when hot water is turned on at two points of intake at the same time

The scheme becomes more complicated if, while using hot water at one point of the intake, it becomes necessary to turn it on at another point, for example: with the shower turned on in the bathroom, it became necessary to wash your hands in the toilet sink. In this case:

• the rate of use of hot water increases sharply, its consumption increases,
• a weak pressure of hot water appears;
• the flow of cold water into the boiler increases,
• a drop in the temperature of the boiler heat exchanger leads to the fact that the water temperature at the first intake point ceases to be comfortable,
• a few seconds are needed to turn on the boiler automation for heating,
• a few more seconds - so that both users can use water at a comfortable temperature at two points of the intake.

During this time, both users cannot fully use the hot water. She arrives intermittently. The unproductive consumption of water uselessly going into the sewer increases dramatically.

What if one of the users turned off the water? In this case, the hot water consumption drops sharply. A temperature jump occurs on the heater of a double-circuit gas boiler. As a result, the temperature of hot water rises sharply at that point of intake, which continues to work. The user cannot fully use the water, it goes into the sewage system until the boiler operates automatically and the water of the required temperature begins to flow to the user in a stable mode.

Since such situations are repeated several times every day, the unproductive consumption of hot water increases every day. At the same time, one should not forget about the discomfort that users experience at moments of unstable hot water supply.

Ways to solve the problem

The problem can be solved in ways that require significant investment, for example:

• use with a boiler,
• purchase of a new boiler with a built-in boiler.

However, there is a method that is less costly, but very productive - inserting an electric storage heater into the hot water supply circuit. Moreover, for this purpose, any standard heater with a volume of 30 liters, regardless of the manufacturer, is quite suitable.

Use a water heater

A water heater embedded in the hot water supply circuit acts as a buffer tank. Its purpose is to equalize the temperature of hot water and smooth out possible temperature fluctuations. The storage water heater and the gas boiler heater are set to the same operating temperature.

Even if hot water taps are simultaneously turned on at different points of its intake, all users will receive water from the storage tank for the first time. The time spent waiting for a comfortable water temperature is reduced. Waste water consumption is reduced.

Turning on and off the hot water supply at any point of the intake causes a difference in the temperature of the water leaving the gas boiler. However, this water enters the lower part of the water heater, and when it leaves the upper part, the temperature jump is completely smoothed out.

Connecting the water heater via ball valve allows you to switch to the usual system of gas boiler operation at any time, which can ensure uninterrupted hot water supply in the event of a water heater breakdown.

The use of a bypass jumper with a tap in close proximity to the boiler allows the boiler to be excluded from the hot water supply system. If the boiler is on maintenance, the use of an existing water heater will ensure the smooth operation of the hot water supply system.

Use expansive tank

V winter period when the boiler has a heating circuit, any hot water activation leads to the fact that it is turned off so that the hot water circuit can be turned on. During the summer period, when the boiler is not connected to the heating circuit, each hot water activation leads to the switching on of the gas boiler.

Often the user turns on the hot water tap just to rinse their hands. The boiler turns on or switches, hot water flows through the pipes. But the user may simply not wait for it, having washed their hands with cold water.

Meanwhile, frequent and useless switching on and switching of the boiler "eat up" its service life. A possible way out is to install a small expansion tank. It is installed in front of the water heater. In the presence of such a tank, at the first time after turning on the tap, hot water enters the pipe exclusively from the water heater due to the increase in pressure in the tank. Thus, in the case of a short use of hot water, there is no need to turn on and switch the boiler.

Use recirculating pump

The best option is that the water heater is located in the immediate vicinity of the hot water intake points. The closer it is, the faster hot water enters the tap, the more efficiently it is used. If this option for installing a water heater is not possible, then it is recommended to install a recirculation pump.

The pump is installed between the water heater and the hot water intake points, providing a slow movement of hot water through the pipes. In addition, if you embed a heated towel rail in this section, then it will perform its direct function at any time of the year, regardless of the operation of the boiler heating circuit.

The effectiveness of the proposed method

With a relatively low cost of money, the installation of a water heater, expander and pump allows:

• save up to 25 thousand liters of water per year if a family of four lives in the apartment,
• use water of a comfortable temperature even in the case of simultaneous operation of several points of water intake,
• reduce gas and electricity consumption,
• extend the service life of the double-circuit boiler.