Vaillant Ecotec Plus 824 operating cycle

[alaric]

Hi all. My first post on the forum. It looks to be a very usefull resource.

I've had my Vaillant for about a year now. I've been concerned about the central heating cycling. I've been observing it this evening, and whenever it comes out of S7 (heating pump overrun), with the radiator symbol flashing (anti cyling mode) while it's displaying S7 for me, it runs the CH pump for a few seconds, then goes into S97 (water pressure sensor check is running). In this state the CH and DHW demands are blocked, so the whole system seems to stop. This lasts for about 10 secs, then it resumes the start up sequence to heat up the radiator water again.

Does it have to check this sensor each time round the loop? It sounds like hard work for the boiler. I'm wondering if this is normal operation. If not then it's under warranty so I'll get it looked at.

Thanks in advance.

Sean.

 

[gas4you]

I've never noticed one doing this as yet.

What is your system pressure?

 

[alaric]

Hi. My system pressure last night while the system was running, was 1.9 bar which I read from the digital display not the analogue guage. Interesting that you've not seen one doing this before. It does seem rather strange that it would check the sensor each time round the loop - it stops everything else dead while it's testing. Otherwise it seems to be working fine.

Sean.