Vaillant Ecotec 186/3-5 Plus Condensing Boiler Hums During Operation - Solutions & Experiences

Question

Has anyone encountered a boiler hum during boiler operation. I have a Vaillant Ecotec 186 / 3-5 Plus boiler and the boiler hums from time to time. During the service technician's visit, the problem did not occur, and the service technician stated that everything was fine, and the boiler hums...

Darek A. · Answer

Pump - bows.

ls_77 · Answer

You can remove the casing and put your hand on the pump. It will probably vibrate slightly. Either it is over or the debris has accumulated in it.

Darek A. · Answer

Exactly, because in the gas boiler, apart from the pump, there are no mechanics that would emit a constant hum.

ls_77 · Answer

Alternatively, the fan may also cause a hum, or more precisely, a muffler which draws air in.

ptak01 · Answer

I was also thinking about the pump, but whether the pump should not make noise, regardless of whether hot water is being prepared or heating is working. Meanwhile (maybe it's a coincidence and a lack of careful observation), the hum only occurs when there is active heating.

Darek A. · Answer

The pump circulates a closed circuit of water in the radiators so that they all heat up, hot tap water flows into the boiler fresh, which simply pushes it with pressure without the need for a pump

mauri_b · Answer

Go film man, don't spam. bird01, open the front cover and listen, for now it's reading coffee grounds.

ls_77 · Answer

With hot water, it is like you write, but to heat this water, the water circulating in the boiler in the so-called short circuit, i.e. the pump pushes the boiler water to the main exchanger where it receives heat from the burner and flue gas, and then pushes it to the secondary exchanger where it gives the heat to the incoming cold water (it can be a plate exchanger in a combi boiler or a coil in a DHW tank). Perhaps there are greater resistance in the central heating installation here and the pump is more difficult to push the water than in this short circuit to heat the hot utility water.

kz61 · Answer

When there was a service technician, he probably removed the casing and nothing strange happened then. So the analyzer and checking what it sucks is one time, and the gas tightness check in the boiler (on the move) is two.

ptak01 · Answer

at the moment there is silence, I am waiting for symptoms to appear

nickiel · Answer

Buddy bird01 what came out with your boiler because mine started to rumble exactly the same ...

ptak01 · Answer

service diagnosis: pump to be replaced, but after replacing the pump, a symptom appeared after some time - and here the reason turned out to be clogged with stone elbow 90 ° below the boiler.- and the pump had problems with pushing the water through. there was silence after cleaning the elbow, An interesting fact is that the filter on the boiler was clean ...

[Solved] Vaillant Ecotec 186/3-5 Plus Condensing Boiler Hums During Operation - Solutions & Experiences

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