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Atag IS40 System Boiler Questions

View the thread, titled "Atag IS40 System Boiler Questions" which is posted in Boiler Advice Forum on UK Plumbers Forums.

B

BadgerSky

Hello,

Recently moved into a property which has an Atag IS40 System Boiler (2018) with hot water tank.

We've noticed that something is continuously running. The flame symbol isn't present on the display, but the boiler is warm to touch and is making a noise.

The CH Demand icon (radiator) is continually flashing, even with all radiators turned off, zones off etc.
The system starts up every ~10 mins for a few seconds and then goes back to it's continual running sound.

  • Should it have something continuously running? Assuming this is a pump or something?
  • Should the CH demand icon be flashing even when zones are off etc? Looking at the manual - flashing indicates something is demanding heat.
  • Noticing that one of the "Down heat" pipes is usually warm.

Any ideas? Normal? I'm used to Oil - never had a Gas system boiler until now.
 

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