Vaillant Eco Tec Plus 637 - issues

[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 ?

 

[SafeGasInstall]

who knows Phil 🙂 we need a picture to be 100% sure

 

[Ermintrude]

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 ?

Valiant engineer probably wouldn't have noticed! Had older one with f78 code - air bubble in pressure sensor... Valiant have a kit which lifts sensor up 5 mm custard paid for 3 parts service thing..... Got a pump expansion and something else!

 

[Dannyparty92]

What is anti cycling mode?

 

[Nostrum]

Stops the boiler pinching your mountain bike and going out for a midnight ride around the block

 

[santhosh]

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

Thanks Phil, when in auto mode the zone valves open and close as per the time no issues.
today the engineer from vaillant came around again, he said the thermostat temperature was more than the flow temperature in the boiler hence it was repeatedly turning on and off, then he changed the temperature in the boiler to 70 and set the thermostat temperature to 65 and said it should be fine now and left. He also reduced the load to 24KW from 36KW.
After these changes the boiler was on for 25 mins at one stretch to heat up the water in the cylinder after that it's starting once every 15 mins for 3 mins and shutting off. when it starts the burner comes on for 2-3 mins then the extractor fan with runs for 8 mins this continues so there is constant noise either burner or fan 🙁 will check with the installer if he has removed the 24v rs link as you suggested.

Regards,

 

[santhosh]

who knows Phil 🙂 we need a picture to be 100% sure

what picture do you need? the boiler circuit?

Thanks,

 

[SafeGasInstall]

.........yes

 

[santhosh]

.........yes

I can see the 24v pin is removed, is that what you guys were referring ?

Thanks,

 

[phil the bucket]

View attachment 15096

I can see the 24v pin is removed, is that what you guys were referring ?

Thanks,

Yes that's ok can u take pic off the other side off the circuit board where the live neutral and earth go

 

[Dotty]

Be careful on this thread guys.

 

[SafeGasInstall]

sorry dad

 

[stevetheplumber]

is it me but is there just three wires coming into the boiler no switch live?

 

[phil the bucket]

is it me but is there just three wires coming into the boiler no switch live?

Thought that aswell but can't see bad angle on photo

 

[tamz]

There is a black going into RT.
Check external wiring and zone valves for sticking micro's

 

[phil the bucket]

There is a black going into RT.
Check external wiring and zone valves for sticking micro's

My thought is there maybe a perminet live in RT as it's a new installation it needs checking by a competent person really
think this person is doing the work himself as croppie said be carefull