Vaillant Eco Tec Plus 637 - issues

[Ermintrude]

That's if there is a wiring Center And not just a ball of wires and insulation tape!

 

[santhosh]

Hello Forum,
I had the installer comeback and correct the wiring, when the timer is in auto mode boiler turns on and off as per the settings in the timer. where as when the timer is in continuous mode the boiler always stays in demand mode (radiator icon displayed in the boiler display panel) boiler starts and shuts off atleast 8 - 10 times in an hour.

Spoke to vaillant they suggested to check the pressure in the boiler and bleed air from all the radiators and make an appointment if it continues the same, the builder came around this evening and increased the pressure to 1.2 bar and released air from all the radiators but that hasn't helped.

I feel wiring issue is not completely corrected, how ever he says he has followed what has been suggested in the boiler and timer manual. Don't want to call vaillant as if its wiring issue their engineer had already told that it will be charged next time unless it is corrected before the next visit. Do you guys feel it to be a wiring issue?

Many thanks,

 

[SafeGasInstall]

from this point you need to get a heating engineer in , and forget about your builder mate

 

[Ermintrude]

When u say starts and shuts off. Does it power off? Does the burner shut down ? Does the pump stop? Sounds like possibly flow reaching temp and boiler just modulating down? Possibly partial load too high?

 

[SafeGasInstall]

or boiler is too big for your house

 

[Ermintrude]

Probs way too big! But turn load down.

 

[santhosh]

When u say starts and shuts off. Does it power off? Does the burner shut down ? Does the pump stop? Sounds like possibly flow reaching temp and boiler just modulating down? Possibly partial load too high?

yes, the burner comes on when the boiler starts, stays on for about 2 mind and goes off then the timer icon is displayed and the heat sink fan will be on for 10 mins then boiler completely turns off after five mins starts again this repeats for ever.

 

[santhosh]

or boiler is too big for your house

before ordering this model I checked on vaillant site with my requirement and it suggested this model and also the fitter and builder had suggested this 🙁

 

[chris watkins]

Post 12, it's a standard 3 bed house with a 37kW in it, it's going into anti-cycling mode ?

 

[GasmanxxxR1]

37kw for a combi maybe, not for system boiler and unvented

 

[Ermintrude]

Recovery time 3ms! Boiler well over sized. U needed 837 combi or perhaps a better solution would have been 24kw system boiler.

 

[SafeGasInstall]

Recovery time 3ms! Boiler well over sized. U needed 837 combi or perhaps a better solution would have been 24kw system boiler.

i am more of a 18kw if not 15kw tbh

 

[SafeGasInstall]

before ordering this model I checked on vaillant site with my requirement and it suggested this model and also the fitter and builder had suggested this 🙁

please re read post 43

 

[chris watkins]

Thank you Zebedy for re-enforcing the points made earlier in this thread.

"ditto" LOL

 

[tamz]

before ordering this model I checked on vaillant site with my requirement and it suggested this model and also the fitter and builder had suggested this 🙁

Of course it did. Maximising profits is the name of the corporate game.
Just look it up on the web and Bobs your mothers brother for all the answers :smile:

 

[phil the bucket]

I think the problem is that the installer has left the 24v rs link in the boiler
This needs to be taken out when using external controls hense why the boiler is on constantly on
the reason it keeps going on and off all the time is that the boiler is just pumping round a small circuit when the zone valves are shut then when it reaches 75 degrees will turn off eventually the boiler will overheat and u will have to keep re setting it
When the zone valves are open ie when on at the proggramer the boiler will work fine
Should be a simple fix really hope I explained this ok

 

[tamz]

Good shout Phil. Overlooked that one as it is mentioned somewhere (can't be bothered reading through it all) that vaillant came out¿
Btw i wonder why have they made the new links a bit bare silver wire you can (well i can't) hardly see instead of a nice bit bright red? Maybe to reap some call out cash??

 

[Ermintrude]

"ditto" LOL

Hasn't some one already said this?

 

[SafeGasInstall]

Good shout Phil. Overlooked that one as it is mentioned somewhere (can't be bothered reading through it all) that vaillant came out¿
Btw i wonder why have they made the new links a bit bare silver wire you can (well i can't) hardly see instead of a nice bit bright red? Maybe to reap some call out cash??

Me think :
if the link was in the Vaillant engineer would have seen it !?

 

[phil the bucket]

Me think :
if the link was in the Vaillant engineer would have seen it !?

Doesn't look like the vallient engineer has resolved the prob from the last post it still sounds like the boiler is constantly on to me that can only point to the live link being left in

Is the programmer opening and closing the zone valves ?