Vaillant Ecotec Plus 824 Clicking Noise Question

1 Apr 2008
Reaction score
United Kingdom
Hi, new to this forum as a poster but been "lurking" here for a while.

Quick Question

I had my central heating system updated a week and a half ago with a new Vaillant ecotec plus 824 combi boiler and a magnaclean installed. the system was powerflushed with sentinel cleanser during the installation. All the rads have trvs on except for one in same room as wireless thermostat/programmer and a towel rail in bathroom. the system was treated with corrosion inhibitor on completion of the installation.

The boilers performance is a huge improvement on my old combi however it has over the last few days developed what could be described as a loud 'clicking' noise when operating in central heating mode. it continues when the boiler is not operating for a while until i assume it has cooled down. So far this has not affected its performance in any discernable way. for any guys who install these boilers is this normal?!

Any ideas or suggestions will be appriciated!


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Rereading - sounds like just expansion/contraction noise. See if you can isolate it with a "mechanical stethoscope" like a big screwdriver, with your ear on the handle end
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Possibly the pump? Has a default 5 min over run on ch. Is this how long the clicking lasts?

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