vaillant 428

[krazaq]

ok thanks for information in the past.

now the boiler is fully functional but keeps going off and on. the temerature on the screen drops and it fires up again till it gets to about 80. pump is running all the time.

When is goes off the central heating icon starts to flash.

Any ideas.

 

[Boilerman2]

Are the Radiators Hot?? if not it suggests a Circulation problem - however has the installer set the Maximum Heating input to suit the system load??
if the boiler input is too high, then the modulation may not be able to react quickly enough to the rising temperature causing the burner to shut down on its high temp setting this starts a timer to prevent the boiler re-firing for several minuites
careful setting of the max heat input will reduce this problem

 

[krazaq]

Are the Radiators Hot?? if not it suggests a Circulation problem - however has the installer set the Maximum Heating input to suit the system load??
if the boiler input is too high, then the modulation may not be able to react quickly enough to the rising temperature causing the burner to shut down on its high temp setting this starts a timer to prevent the boiler re-firing for several minuites
careful setting of the max heat input will reduce this problem

How would i set max heat input

 

[kevindgas]

select D.0 and set to 1.5 x radiators I:E 6 rads = 9kw
see p.39 of your manual

but if its cycling after that then something is wrong with your system not the boiler, most likely is a pump gate valve not opened.


and please don't keep starting new threads just continue on the same one we will find it!

 

[krazaq]

ok got one question

old system was primatic, the boiler installer did not even know anything about it. and neither did many others.

anyway had a in and out feed down stairs
had a return feed from up stairs to downstairs..

Created new in feed from up stairs bathroom radiator.. kept the return feed going to downstairs return feed. what should have been done with the in feed downstairs????? (connected to the return feed?????)

 

[kevindgas]

ok got one question

old system was primatic, the boiler installer did not even know anything about it. and neither did many others.

anyway had a in and out feed down stairs
had a return feed from up stairs to downstairs..

Created new in feed from up stairs bathroom radiator.. kept the return feed going to downstairs return feed. what should have been done with the in feed downstairs????? (connected to the return feed?????)

even though i've been in the business for 25 years plus, I personally have only ever seen 2 primatic systems so know little about them.

but I fail to understand why the pipework was rearranged? if it worked before then it should have worked with the new boiler as the 400 series are open vent or sealed system compatable.

i'm sure someone will come along with some answers, it may take a while though as not many will have seen let alone worked on primatic.

 

[monoxide62]

ok got one question

old system was primatic, the boiler installer did not even know anything about it. and neither did many others.

anyway had a in and out feed down stairs
had a return feed from up stairs to downstairs..

Created new in feed from up stairs bathroom radiator.. kept the return feed going to downstairs return feed. what should have been done with the in feed downstairs????? (connected to the return feed?????)

Don't quite know what you mean?

How can the installer not know this is a primatic? , how did he/she drain the system without noticing the feed & expansion cistern gone walk abouts ............................from what you are saying i'm guessing that you are asking where to connect return from primatic cylinder into system pipework? ................has any inhibitor been used?

 

[krazaq]

ok got one question

old system was primatic, the boiler installer did not even know anything about it. and neither did many others.

anyway had a in and out feed down stairs
had a return feed from up stairs to downstairs..

Created new in feed from up stairs bathroom radiator.. kept the return feed going to downstairs return feed. what should have been done with the in feed downstairs????? (connected to the return feed?????)

Don't quite know what you mean?

How can the installer not know this is a primatic? , how did he/she drain the system without noticing the feed & expansion cistern gone walk abouts ............................from what you are saying i'm guessing that you are asking where to connect return from primatic cylinder into system pipework? ................has any inhibitor been used?

ok the original ideal mexico boiler blew up. This was in the summer. The Engineer/Gas fitter came around looked at the system and said that he would recommend a vaillant 428, to give enough energy around this house. So he came a week later with a big smile and tghe boiler.

Dismantled the old boiler, and I also took a week off to give him a hand.

He thought there were two tanks in the loft one for water and one for radiator. While investigating he realized there was only one tank and it took part of two days for him to figure out hos the system was being filled. Luckily I read Primatic on the cylinder, so googled it and it works on some bubble system, hence sometimes we used to get brown water in hot water taps as the bubble broke. But I never mentioned anything as the gas fitter thought i did not know anything. anyway i let him carry on.

Four pipes were running from the original boiler with pump on the return.

The engineer said that the pump now needs to on on the flow. He connected up everything according to the book as far as i know.

The only thing is that the in flow for the radiators downstairs is connected to the return flow, which i don't think is correct or is it? When i asked he said that the return will feed the radiators downstairs but i fail to understand how.

Anyway I decided to do the electrics my self and not knowing much about gas, they work in perfect harmony with the boiler after a few hiccups.

The only problem now is that the upstairs radiators are nice and hot, and even the thrmostats work, although there is no thermostat in the bathroom.

But downstairs heaters are not hot at all and i think its cos the in flow downstairs as been connected to the return flow from upstairs.

I think there should be a in flow connection from upstairs to downstairs in flow instead of downstairs in flow being connected to the return pipe. This is my personal feeling, i don't know if this is correct. but again i have not mentioend it to the engineer till i am sure.

 

[DP]

original ideal mexico boiler blew up

What do you mean, 'it blew up'. I visualise an explosion with bits of Mexico scatter all over. I thought the Mexico was bomb proof

When the time comes when the client (who is paying me to do the job) is educating me, I will hang my U gauge on the hook and retire Trigger to the field

 

[Agile]

Your installer seems to have very little idea of heating systems.

Unless you are in a five bed + detached house you have a seriously over rated boiler which will probably give you problems.

You certainly should have pointed out that it was a primatic. He should also have told told you that it ought to be replaced as well as fitting TRVs.

Tony

 

[krazaq]

Hi thanks. my plumber is an XXXX. anyhow i put in a new in feed from up stairs to downstairs.now the system is full working. yes my installer did change all the TRV's and new radiators. charged me so much and i don't he had a clue.

Not that i know anything, anything i have come to known is through this very website. And I am grateful to this website. I like to thank everyone.

And my house is quite big. it was an old peoples home, so the boiler is the correct size. Thank you for your comments.