Each gas boiler needs several key components that will monitor the unit for it to work properly. In the event of any deviations, the various components are triggered and the plant simply ceases to function. But at the same time, you need to understand how to check a gas boiler solenoid valve, a thermocouple, or any other component. After all, knowing about the malfunction, in most cases it can be removed by yourself.
This device is one of the few that allows you to measure high temperature. It is both simple and yet reliable. A thermocouple is made up of two conductors of different metals, which are connected at different points. All this makes it possible to use it for different purposes. The main disadvantage can be called an 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 rapidly (say, for some reason, the fire went out or there were problems with the chimney), the system is triggered, in which a signal is sent to the solenoid valve, and the gas supply stops. Therefore, if this component does not work, the equipment is incapacitated.
The sequence of actions to check:
- The thermocouple has two ends, the first of which is heated by an igniter, and the second is attached to the solenoid valve. It is necessary to separate the device from the boiler, whether it is conventional or condensing, having a three-way valve.
- Then provide a constant flame. A candle is the best.
- We 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 for millivolts. One probe is placed on the body, and the second on the output contact.
- After half a minute, a working thermocouple will show an EMF in the range from 17 to 25 mV. If the indicators are normal, then the problem of a non-working system may be different.
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 malfunction, it closes the fuel supply. Emergency situations in the operation of gas heating can occur due to various factors:
- fuel pressure drop;
- lack of fluid in the system (you can check the joints, three-way valve and pipes);
- traction deterioration;
- gas leak.
Each of the above problems is dangerous for human life, and therefore the further operation of the system is unacceptable. That is why the solenoid valve works. Its original position is open. To close it, an electrical impulse is applied, 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 comes out of standing position, since it has great potential for use. Despite this, moments still happen.
There are two ways to check the operation of this valve:
- Fire. The used thermocouple is replaced with a new one. The automatic button is turned on. Next, the igniter is ignited and 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.
This element supplies the burner with a current discharge (spark), which is necessary for igniting the fuel. In addition to other elements that directly affect the operation of the unit, the component can also fail. As a result, all automation will work, but the fire will not appear, since there is no source for ignition.
How can I quickly check the ignition transformer of a gas boiler for operability? Just. You need to do a few simple steps:
- Through a special window, see if the discharge is going on or not.
- Using a tester, check the voltage coming out of the controller during the ignition attempt. Normal is a figure that falls in the range from 187 to 235V.
- If a problem is found, disconnect the power from the transformer and connect it back.
- Check again.
In any gas boiler, many safety elements and sensors are installed to monitor the correct operation of the unit. In the event of situations that clearly threaten human life, a system of complete shutdown of the installation is triggered.