DIY ariston gas boiler three-way valve repair

It may be that the issue has already been resolved in similar topics

We continue to heal childhood diseases of the turbocharged boiler ariston uno 24.
This time the yellow chimney light came on. Since the breakdown happened at night, it became cool in the apartment until the morning.
Symptoms: the boiler turned on, the chimney turbine tried to start, then it tried again and the boiler went into error mode.

An autopsy showed that the fan relay "blinks". It has a special round hole filled with transparent polymer. When the fan starts up, a blue glow is visible in this window.

In the second photo, the arrow indicated on which relay the glow was visible.
The relay was wiped out, swapped with the circulation pump relay (lower relay). And it was checked, the pump did not work, the fan turned on.

It was too lazy to run to the store, so I opened the relay, cleaned it and installed it in the place of the circulation pump (it switches least of all).

The image shows where you need to open the relay, carefully open a third of the top of the case with a clerical knife (I gently squeezed the relay in a vice), while gently prying and bending the notched part.
This part covers the compartment with contacts (I unknowingly opened the whole inch, the second compartment contains the coil and the retractor).
I analyzed the condition of the contacts, cleaned it up with a piece of paper and slightly bent the extreme burnt contact, reducing the switching gap.
After cleaning, I sealed the case with transparent tape, but probably better with non-burning electrical tape.

Later I'll go get a suitable relay, and then I'll see how long it will last.

I will be very grateful, thanks in advance

in the photo I painted the missing spring in red, and the one in the photo is broken in my whole

THAT will not fix the leak. Most likely assembled for replacement.

thanks Maxim, could you still measure with a barbell
wire diameter, and compressed length

And also, as you will assemble, take a photo of the assembled unit, that is, a stock, a plastic washer, and two springs, if it's not difficult.

most likely the stem seal is leaking on the 3xx valve itself, although I may be mistaken, you may have to buy a repair kit. The valve itself was not disassembled, therefore, it is hard for me to judge the true reason, only guesses.

In my case, one spring in all

9.6 mm total length is obtained according to the Kostin method, and + - 0.6 mm inaccuracy of devices throughout the entire area.

THOUSAND DEVILS. after looking at the last photo everything fell into place. It turns out that the spring did not rot, but that narrowed end of the spring rotted away, and the remainder of this narrowing remained on the rod, hanging loose, so I thought that there was a second spring there. Now it is clear why the heating channel is not closed.
Here's another question, how to remove the servo from the valve with the least amount of effort, i.e. disassembling the boiler as little as possible, last time I had to unknowingly pull out the entire lower part

according to the Kostya method, you need to know exactly the diameter of the wire, there would be a barbell, but it turns out that I have a spring, instead of narrowing I will carve a special washer, since there are machines

Boiler Arderia ESR 2.16 pleased us with his trouble-free work for 3 years. And the other day, the household noticed a water leak from the unit. And it dripped normally, I even had to substitute the bucket.

I immediately remembered 2 observations that spoke of an imminent disaster:

• the pressure in the system slowly dropped, it was necessary to top up once a week, two times;
• the hot water tasted of rust.

Before calling the gas workers, I decided to try to figure out the topic myself.If the problem is not big - why bother busy people. Yes, and these busy people take for their services, traditionally, not weakly.

Disconnect the boiler from the 220 socket. Remove the front cover. There are no seals, no secrets, everything is in sight, 2 bolts.

Immediately I saw from where the trickle runs along the boiler body. We read the marking on the mechanism - m2la24zs32.

In the global network we find the name - Arderia 3-way valve (2040105).

There is a part on sale, it costs from 3300 to 4400 rubles. in different parts of the country. But there is interest in trying to fix it, if possible. A video with detailed instructions came across on YouTube. 10 minutes, and I'm a master, you can start.

Online help:

The three-way valve in boilers is designed to correctly redirect the heating medium (water). It is a branched adapter with a temperature sensor and an electric drive. It allows double-circuit boilers to quickly warm up liquid for heating systems and hot water supply. The valve is switched according to two main modes: heating the coolant, heating the service water. The principle of operation is as follows: in the first mode, the three-way valve blocks the access of the heat carrier to the second heat exchanger (for heating domestic water), in the second mode, the valve opens the access of hot water from the heating system to the second heat exchanger (the circulation of the heat carrier allows heating water to be supplied to the tap).

First of all, we disconnect from the heating and water supply network (we shut off all 4 taps from the bottom). We drain the water into the bucket through a special tube on the left, and a special tap-valve.

Then we remove the locking valves from all the tubular connections of the problem unit. As well as wires. We are trying to pull out the valve. Carefully! water will pour out of the freed pipes again - we catch it with a bucket and rags.

My valve did not want to go out on its own, I had to remove the heated water supply unit on the left with it. Fortunately, that is attached with only one bolt to the heat exchanger.

Wiggle, shake, pull out. I do not recommend using a lot of force.

We take the ill-fated three-way valve and settle down at the table, even a kitchen one, like me. It is extremely inconvenient to repair it on the weight and on the knee.

We unscrew the screws, remove the engine, it is unnecessary to disconnect the wires from the terminals:

Remove the plastic wheel from this side of the 3-way valve. He is not allowed contacts. We take out one, with a red wire, the second (double) - we do not completely take out:

We take out the wheel. We remove the cotter pin and the washer along them. Now you can unscrew the 4 screws on the other side of the valve:

And pull out this engineering marvel:

The rubber ball rotates with a motor and switches the flow of water in the pipes - heating or hot water supply. Essentially, it plugs up the holes.

The photo shows the wear of the ball (the surface has become rough), and the silicone rings:

I didn't rush to the store to look for O-rings, took off the dimensions, I'll look for it on occasion.

Online help:

The main and practically the only reason for the breakdown of a three-way valve is its strong contamination. Constant switching of water flows can lead to deposits of formations on the inner walls of the distributor. The action of a low-quality liquid with numerous additives can even affect a new element of the heating and heating system. Another factor (to which single valves are being modified) is simple wear due to long-term operation.

For the repair, I used FUM tape, cut into thin strips and wound on the seats of the oil seal rings. Naturally, winding such a trifle is not easy neatly, but it is possible.

Result. Hopefully not a lot and not a little rewound ribbons.

That's the whole repair. You can collect everything back. It is more convenient to install everything in the boiler also in tandem with plastic pipes from the hot water supply:

For ease of assembly, photographing of the process helps. Sometimes I had to flip through photos on my phone and check myself.

I poured water into the boiler, there is no leak. Started up the heating - bingo! Works and does not drip.

On the Internet, they write that the reason for the failure of this node is dirty water. I cannot agree with this, I think the reason is a lack of design. The rubber ball should press quite hard against the holes, the axle with silicone (or rubber) rings is under heavy stress. Those. the work on the rings is not only to retain water, but also to play the role of a bearing.

I'll see how long my repair will last. I will look for rings for repair. And hopefully the valve is always on sale.

do not understand why he is needed in the boiler at all? Ariston class is not a class at all, shit is a boiler, it constantly breaks

Vertikadshchikov immediately into the ban, a finger on the floor. D.B.

For some reason I can't pull out the valve servo. In your video, it just pulls up. In my case, there is not enough headroom: the servo cover rests on the tin plate above it and that's it. In this case, the part of the actuator (the one that is caught by the locking plate) is still in the valve. Tell me what to do! (((

Maxim Ovchinnikov Hace 21 un día

And how did the boiler behave when it broke, I also seem to have a problem in the valve, you turn on the hot water, it will work a little and is cut down for heating, cold water from the tap, do you think it or not?

Igor Perevoshchikov Hace un mes

I took it apart on the spot, everything rotted, let's think

I tried all directions but still not enough space. I will try to disassemble the cauldron harder, since it is broken and used for donation.

Johnny Petrov Hace 9 meses

G Schmidt, try to gently move it in different directions and pull it out on its side, then it is 100% removable, or the stem itself is not fully inserted, because of this there is not enough height

The fact of the matter is that I can't take it off! In your video, you just pull it up and that's it. I do not have enough distance in height and I can't pull it up. About 3-5 mm are missing .. Why so - I don't even know. I'll try to attach a photo one of these days for clarity.

Artur Anisimov Hace 9 meses

Why is the drive called brains, and the cartridge is called the stock?

vitaly topalov Hace 10 meses

partsbypost.bu Hace 10 meses

Question: the drain valve does not hold pressure and water is dripping through it. Is the valve for replacement or can it be repaired (adjusted)? And how is he filmed?

Johnny Petrov Hace 10 meses

vitaly topalov be sure to relieve pressure through the drain valve

Official BAXI Forum in Russia

Message Shestov Yuri »05 Dec 2016, 19:52

Message BAXI-Ural »05 Dec 2016, 20:36

Message Shestov Yuri »06 Dec 2016, 18:25

He threw the terminal block away from the motor, the heating works smoothly, when it hooked up and opened the hot water tap back, the boiler hummed again and the heating temperature climbed up, as if when hot water was opened, the three-way tap closes the heating circulation, I close the hot water and the heating temperature drops, the boiler turns on for heating the heating, and sometimes after closing the hot water tap, the heating temperature remains at 65 degrees and does not drop. Naturally, the boiler freezes, the batteries cool down, and the temperature in the boiler does not drop, therefore it does not turn on. I thought maybe it's the brain or is it in the motor? Where can you get it in the Chelyabinsk region and how to check your motor for malfunction?

No matter how solid the gas boiler is, its individual parts are subject to greater impact and early wear. There is a need for spare parts. Therefore, Ariston, in addition to the boilers themselves, also supplies high-quality spare parts for them. This extends the service life of the heating equipment without replacing the installed unit, which is more convenient and cheaper.

Spare parts for gas boilers by Ariston

The instability of the voltage level in the electrical network is a factor that often negatively affects the uninterrupted operation of Ariston boilers. The electronic board takes the blow.

It connects to a 220 Volt household network and controls the processes and modes of the unit, controls the parameters and displays data on the LCD segment screen.

Thanks to this board, remote control devices are connected to the boiler:

1. room thermostat;
2. room (remote) temperature sensor;
3. remote control panel;
4. timer-thermostat, etc.

For protection, a 2 Amp, 250 VAC fusible link is installed on the board.If a short circuit occurs in the network, the fuse will blow (the insert will melt), and the board will turn off the boiler.

A varistor is provided to limit voltage surges. Above 275 volts, it reduces the resistance, which causes the fuse to blow.

Electronic control board (electronic control unit) Ariston UNO

If during jumps on the board only the protective elements are damaged, which are re-soldered, then when high voltage hits, the spare parts will not save - the board is changed. This situation occurs when lightning strikes.

The electronic board is equipped with plugs for powering the pump, turbine and boiler valves. The sensors for monitoring the boiler operation are also connected to it.

The service life of the board ranges from 7 to 10 years, subject to correct operation.

The three-way valve is one of the key parts of the hydraulic block of Ariston two-circuit heating boilers. Its function is to change the direction of the coolant: through the primary heat exchanger to the heating pipe or to the secondary DHW heat exchanger (hot water supply).

The valve is controlled from the electronic board via an electromagnetic relay. In standby mode, the valve is in the DHW position. It is fixed to the hydraulic block by means of a fastening bracket.

Malfunction of a three-way valve - a coolant leak through a rubber gland, which wipes over time. The valve is driven by an electric motor. If water gets in, the drive will burn out.

This problem is more common in older models where a one-piece valve (stem) is installed. In new models of Ariston boilers, such cases are rare. To avoid such a situation, oil seals are lubricated with a special compound every year.

Ariston ACO / UNO Three Way Valve Repair Parts With Sleeve

The electric drive itself is easy to change. There is no need to drain the water, turn off the power supply and remove the latch.

The valve has two limit switches that turn off the electric motor when the required position is found

The signal from the board to control the valve goes to the actuator. This is how the operating modes of the gas double-circuit boiler change. Which are programmed on the control panel.

The primary or main heat exchanger performs the function of transferring the heat that has formed in the gas combustion chamber to the heat carrier of the heating system (primary circuit water).

Ariston manufactures heat exchangers and spare parts for them in copper, coated with an anti-corrosion compound, or stainless steel. This element is a curved tube supplemented with plates of various sizes. The power of the heat exchanger depends on the number of these plates and the length of the pipe.

The quality of heat transfer is reduced due to the accumulation of dust and soot on the surface of the heat exchanger, and due to sediment deposits inside the element. Such defects are repaired by regular cleaning and rinsing.

The reason for replacing the primary heat exchanger is a leak, violation of the integrity of the element. The reasons for this:

• water hammer - occurs when flushing with high pressure;
• mechanical damage during boiler maintenance;
• freezing is a consequence of water freezing in the heat exchanger.

Secondary heat exchanger of 23 kW Ariston Microgenus boiler

Secondary is a heat exchanger of the secondary circuit or hot water supply system. It is equipped with plates that are interconnected. With their help, heat is transferred from a small circuit for heating water in a column mode.

The more plates in the design of the secondary heat exchanger, the more power.

Since the water in the heat exchanger flows quickly, there is no need for replacement in areas with good quality water. But if water with a high hardness is poured into the heating system, the secondary heat exchanger, due to deposits and frequent flushing, becomes unsuitable for repair, and replacement is required.

Circulation pumps in boilers are used to evenly distribute the heated coolant through the heating pipeline system.This element is important and necessary in systems with a long distance. Since the pump makes the water move faster, it does not have time to cool down, and it is not necessary to heat it up again, but to warm it up a little.

The pumps used in the heating technology of the Ariston company consume energy economically.

By controlling the pump, the electronic board switches to the frequencies required by the process. For hot water supply, the pump operates at a frequency that corresponds to a power of 80 W, and in central heating mode - 55 W. A delay time of 5 minutes is set for switching frequencies.

Small and lightweight pumps run quietly. The outer casing is made of cast iron alloy and the motor casing is made of aluminum. The stainless steel drive shaft is placed on graphite bearings for which the coolant is lubricant.

Grundfos circulation pump for the Ariston boiler

You have to buy spare parts for the pump due to improper operation of heating equipment:

• use of the pump at zero flow;
• turning on the boiler when there is no water in the system;
• low or high coolant supply;
• no rinsing before use;
• instability of voltage in the network (surges and falls).

The enemy of circulation pumps and poor quality water. Do not heat the coolant above 65 ° C, since impurities in the water create a sediment on the pump elements.

With prolonged downtime, the shaft is oxidized, which leads to its blocking. In this case, the circulation pump is changed.

Sit 845 Sigma is a gas valve that is often used in Ariston heaters. This is a multifunctional device for supplying fuel to the boiler burner.

The valve has two solenoids that are connected in parallel. The locking coil is powered by 220 V, and the modulating coil is powered by 9.2 V DC. The valve is controlled from the electronic board.

Gas is supplied when voltage is supplied from the control unit to the solenoid windings. When the shut-off valve is opened, it operates with a minimum power of 9-10 kW, and the minimum possible amount of gas is supplied to the burner. After that, the modulation coil is triggered, and the gas supply power is increased from 9 to 24 kW.

The amount of gas that is supplied during the operation of the coils is changed by the minimum power regulator provided in the valve design.

Sit 845 gas valve used in Ariston wall-mounted gas boilers

Since the Sit 845 is electrically operated, a constant supply of 220 V is required for normal operation. When the required voltage is not available, the valve shut-off mechanism closes and the gas supply is cut off.

The advantages of a gas valve for Ariston boilers are a short time to turn the valve into operation, compact dimensions. Another advantage is the adjustment of the peak level of gas pressure at the outlet using the maximum adjustment regulator.

As with other parts of the boiler that are connected to electricity, power surges are dangerous for the gas valve. Therefore, coils and an electric drive are the most frequently purchased spare parts for a pump.

The main element of the system for removing combustion products from the chimney of a gas boiler is a forced draft fan.

Fan is an electrical device designed to remove waste gas from combustion in boilers with a closed combustion chamber.

The fan casing is made of aluminum or galvanized steel. The electrical power varies from 35 to 80 watts in accordance with the power of the boiler itself.

Power is supplied from a 220 V network. The operation of the fan is determined by a pressure switch. It connects to the Venturi tube on the body of the device. This determines how efficiently the fan works. If the fan does not create sufficient air flow pressure, a signal is sent to the electronic board through the relay, and it blocks the gas supply to the burner.

Gas boiler fan UNO model

A common cause of a malfunction faced by boiler owners is the build-up of a dust layer on the fan blades. This causes vibration and stress on the rotating shaft, causing the appliance to burn out.

Long-term operation and lack of lubricant on the fan deteriorate the bearings. These are inexpensive parts and they are replaced by themselves. The nuance of such a replacement is the installation of the stator in its original position. If it is installed incorrectly, the fan blades will rotate in the opposite direction and the boiler will not start.

In any gas boiler, the main part is the burner, since it burns gas and gives off heat to the heating system. All models of Ariston boilers use Polidoro burners.

The spacing of the nozzles in them is 19 mm. The burner is equipped with two electrodes: for ignition and for flame control.

If the burner is in a closed combustion chamber, a coaxial flue is installed. It will provide both the removal of combustion products and the flow of air into the combustion chamber.

Burner Polidoro for gas boilers Ariston

When the gas pressure in the line decreases, the intensity of the flame in the burner also decreases, which leads to the burnout of the nozzle. If the intensity of combustion is increased manually, there is a risk of burnout of the heat exchanger.

In order not to buy the burner as a spare part, they clean it a couple of times a year.

Cleaning takes place in several stages:

1. cleaning the device that directs the torch relative to the heat exchanger (retaining washer);
2. purging the sensor, which regulates the indicators of the gas-air mixture;
3. cleaning the flame sensor;
4. cleaning the ignition device electrode;
5. analysis and cleaning of the pipe through which the gas is supplied to the burner;
6. cleaning all surfaces contaminated with soot;
7. replacing or flushing the filters in the gas section.

If any part of the burner burns out, an urgent replacement is required.

Flow sensors are installed in double-circuit boilers. The main function is to switch the boiler to the gas water heater mode.

Such spare parts for Ariston are produced by the IMIT company. Their sensors provide DHW starting at a minimum flow of 2.5 liters per minute at a pressure of 0.2 bar.

Ariston UNO flow sensor

Each double-circuit boiler is equipped with a system that prevents water hammer. To do this, it creates a delay in the sensor response of 1.5 seconds.

Information about the work and other types of flow sensors in gas boilers is presented in the video: