Hi,
We've got an ecoTEC+ 937 that's intermittently misbehaving - primarily while I'm in the shower and giving me cold water we're going to call Vaillant out to look at it (it's under contract) but wondered if anyone had any thoughts.
One specific question is where is the 'flow temperature' (i.e. the one normally on the display) taken - and what is that expected to do while the hot water is running.
The system is a fairly simple setup; normal thermostat, no tanks (the one on the boiler is not enabled), normal shower, cold input from the mains. It's a conversion from an old system with some of the original radiators still in, mostly with thermostatic valves.
For your entertainment I've got a video of the control panel during the shower (it's sped up by a factor of 4) showing the flow temp and other status.
http://www.youtube.com/watch?v=K53yjs7e9KQ
It doesn't always do it - but that video shows tonights behaviour:
1) at the start the heatings going quite happily
2) 22:10 (3:30 into vid) I turn the shower on and within 5 mins it's cold; note how the flow temperature as displayed drops down to 40c by the time I turn off at 22:16
3) The flow temperature keeps dropping and eventually it all turns back on and the heating warms up.
4) Later in the video you can see us running the taps again and it heats up for a short while and drops again rapidly - the flow temperature sometimes going under 35c.
The temperature in the shower was cold at about 22:15, today I'd also run a tap and checked it's temperature was also cold - so it's not the shower thermostat. The pressure on the tap and shower is fine.
Note also that the burner is shown as on during that period.
Note also there are no errors displayed (we have intermittently had pressure problems in the mornings and it occasionally needs a top up but none recently)
I had thought perhaps this was only during the really cold nights a few days ago, but it's still doing it now it's warmed up a bit.
Any thoughts welcome.
Dave
We've got an ecoTEC+ 937 that's intermittently misbehaving - primarily while I'm in the shower and giving me cold water we're going to call Vaillant out to look at it (it's under contract) but wondered if anyone had any thoughts.
One specific question is where is the 'flow temperature' (i.e. the one normally on the display) taken - and what is that expected to do while the hot water is running.
The system is a fairly simple setup; normal thermostat, no tanks (the one on the boiler is not enabled), normal shower, cold input from the mains. It's a conversion from an old system with some of the original radiators still in, mostly with thermostatic valves.
For your entertainment I've got a video of the control panel during the shower (it's sped up by a factor of 4) showing the flow temp and other status.
http://www.youtube.com/watch?v=K53yjs7e9KQ
It doesn't always do it - but that video shows tonights behaviour:
1) at the start the heatings going quite happily
2) 22:10 (3:30 into vid) I turn the shower on and within 5 mins it's cold; note how the flow temperature as displayed drops down to 40c by the time I turn off at 22:16
3) The flow temperature keeps dropping and eventually it all turns back on and the heating warms up.
4) Later in the video you can see us running the taps again and it heats up for a short while and drops again rapidly - the flow temperature sometimes going under 35c.
The temperature in the shower was cold at about 22:15, today I'd also run a tap and checked it's temperature was also cold - so it's not the shower thermostat. The pressure on the tap and shower is fine.
Note also that the burner is shown as on during that period.
Note also there are no errors displayed (we have intermittently had pressure problems in the mornings and it occasionally needs a top up but none recently)
I had thought perhaps this was only during the really cold nights a few days ago, but it's still doing it now it's warmed up a bit.
Any thoughts welcome.
Dave