When limescale has built up, the boiler will start to make a whistling noise due to the water being restricted. Hook up the terminals of the multimeter to leads on the thermistor. Speak to your engineer about whether a problem with the pump could be causing your boiler to overheat to find out what needs to be done to solve the issue. Thats why its good to know how to recognise the signs of an overheating boiler. If the PCB doesnt receive the signals it needs, this is when it will shut off before it should, not heat up hot water/radiators correctly, or overheat them. 
The metals are oxidised through a chemical reaction, ground to a fine powder, compressed, and then subjected to a very high temperature. Check temp sensor( red cable entering the tank part No 1600691) is securely fixed to PCB and that the cable is inserted fully into the boiler tank hole with heat paste present. Q: What are the dimensions of my Marco product? The element and inlet valve are turned OFF when this error is detected, This is a recoverable error. Although Vaillant states this as a possible cause, its highly unlikely. So, if you hear the sound of a kettle, contact a heating engineer who will be able to flush out the system and clear it of any limescale. Thermistors are resistors that adjust to changes in temperature. If within resistance range and wiring circuit is ok, replace main PCB 1600345 for Ecoboiler range. Knowing the resistance reading they need (in ohms), theyll use a multi-meter to check this reading. If youre concerned that your boiler is overheating, take a look at some of the most common reasons for this problem, and consult your engineer to learn more about what needs to be done to get your boiler back in full working order. (Note that if this is a low probe wiring fault, the water will stop at the high level probe regardless of the status of the low level). Diagnostic work charged at hourly rate. When the correct range of resistance is measured, normal operation resumes. All appliances that use water can be affected by limescale, and boilers are no exception. Thanks - Afraid I have lost a bit of faith in the professionals.. You must log in or register to reply here. If this is OK the low level probe is possibly covered in limescale/ mineral deposits, Clean low level probe/ descale machine. google_ad_width = 468; In the past, a boiler overheating that wasnt fixed in time would have exploded, with potentially incredibly dangerous consequences. Fortunately, modern boilers are fitted with safety features that mean the unit will lockout before the boiler overheats. Please dont hesitate tocontact usfor more info. This checks that the water in the tank cools when the inlet solenoid valve is switched on. Q: Is there an update/improvement for my Marco equipment? But, due to the internal heat of the boiler, condensation is created and this settles on these electrical components. //-->. It has a certain value at room temperature according to service information. When it comes to a boiler overheating, prevention is better than the cure.
He also writes for "The College Baseball Newsletter." This then allows the hot water to circulate freely around the radiators to heat the space efficiently and effectively. Boiler parts including thermistors, are prone to having problems generated by limescale build-up. See Descale and level probe cleaning procedure. This is a non-recoverable error. 1.
Thanks - Afraid I have lost a bit of faith in the professionals. A thermistor gives a certain resistance reading at a certain temperature. Like these parts, the NTC thermistors give and receive signals. Are you a trade or supplier? 2022 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. If they malfunction, the circuit itself will likely malfunction, also. If there is no problem with the mains water supply, check that the inlet solenoid valve is working. See instruction video. You can either test the leads for continuity both ends, or more preferable, test the leads and thermistor for resistance as one combined test. If you're looking for boiler engineers in your area then you've come to the Once youve turned off the water, its best to talk to an engineer about what might have caused the problem before trying to get the unit back up and running again. If pumping the wrong way you will need to: Thanks for previous advice. If there is a reasonable resistance (18-22) on the element it probably has not failed, so the wiring might be at fault or the PCB board has failed. This indicates that the Thermistor is measuring such a large resistance that it assumes the thermistor circuit is open. When the error is detected, the element and inlet valve are turned off. Unfortunately, these blockages can also result in an overheating boiler, and thats all the more likely if the blockages are significant. If there is too much limescale on the heat exchanger, water flowing through it will be blocked, and the boiler then runs the risk of overheating. If theres a fault with the NTC thermistor you might find: Faults that cause a temperature differential on the flow, return, or both thermistors include: All work concerning gas, LPG and oil boilers should be completed by a professional, and not just for safety. When you say the pump is the right way round, are you sure you mean the arrow cast into the body is pointing the same way as the same arrow on the old one was pointing?
A: Refer to the spec sheets of your specific model on individual product pages. Last one that came round (he was there fiddling for around half an hour), advised me to basically do what ive done. Leaks need to be found and fixed, before moving onto the issue at hand; the thermistors. This error is only displayed after 20 mins of the heater being on continuously. This will reset the error and if the water supply is ok, the machine will return to normal operation.
instead of disconnecting the leads at the thermistor, measure the resistance across the plug where they join onto the PCB. An overheating boiler will usually mean a system shut down, but if it doesnt the situation can quickly become hazardous. Since thermistors are designed to be temperature sensitive, testing them involves the application of heat. You can get free quotes for a replacement boiler right here on Boiler Guide. If your boiler stops working and overheating is suspected, make sure you turn off the water before you do anything else. Replace thermistor connected to PCB. A limescale problem can build up within boilers over time. There are various parts that can leak in a boiler, but the most common are the: Some leaks are so small that you wont notice them. Is there anything else that can cause damage? If your looking for the list of error codes relating to the Vaillant boiler then please read the article Vaillant Boiler Fault Codes And Cures, EPHG LIMITED 2016 to 2022 All Rights Reserved. Hiring someone without the appropriate qualifications could itself lead to your boiler overheating and worse. For any properties with an older central heating system (installed more than 8 years ago), the best way to prevent the unit from overheating is to simply have a new boiler installed.
If there is too much limescale on the heat exchanger, water flowing through it will be blocked, and the boiler then runs the risk of overheating. If an overheating boiler isn't dealt with early on the unit becomes a risk to everyone in the property and the surrounding area.
If this limescale is deposited on the heat exchanged, it can spell trouble for the boiler. Taking these steps will help to keep your heating system running safely, reliably and efficiently. If you need to find a tradesperson to get your job done, please try our local search below, The number one problem that causes damage to electrical components is water damage. New boilers in stock next day installation available! And has made no difference. What boiler is it and what is the boiler thermostat set to? Manufacturers A-B, Manufacturers C-P, Manufacturers R-W,