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Vaillant aqua plus combination boiler

I have a vaillant aqua plus I change the fan and now is not starting up

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First off, I'm not familiar with this particular boiler. I'm in the USA. I believe this is manufactured in the UK and may not be distributed here.
Second, and are you sure you needed to replace the blower in the first place?

Those questions really need to be answered before making any accurate remote diagnostics. This is a pretty complex piece of equipment with costly replacement parts. Some diagnostic and/or service work should be left up to a professional in your area if you're really not sure of what you're doing.

We all (or most of us) like to save money by doing our own repairs. If you feel confident about working on this further you can go to www.vaillant.co.uk to get manuals and service info online. This info will do you much more good than my guesses will. This unit has a diagnostic/control board that will display most faults if you know how to use it. I looked at some of the info online. They have pretty good stuff available to you if you know how to use it.

After all saying that, it "could" be the pressure switch not closing after the fan starts. You didn't say whether the new fan is starting or not. On a call for heat (or hot water) the fan starts (controlled by the main control board), the pressure switch proves the fan is running (and venting combustion gasses out of your home), it most likely has to prove water flow. If all the proving is confirmed, the ignition sequence will begin.....ignition, prove ignition, main gas valve opens, heats water, so on and so forth......

Now, if you still feel confident to work on this boiler, go to Vaillant's web site and read the manual(s). If you're not confident, call the heating man in your area. Just be careful with gas, electricity and hot water!!

I wish I could have given you more info to actually fix your problem, but I need more info as to why you changed the combustion blower to begin with. What WAS it doing? what IS it doing NOW and so on....

Good Luck to you! Let me know what you find out.

Bob
lainemech

Posted on Mar 22, 2014

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Posted on Jan 02, 2017

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SOURCE: hi,i have a vaillant turbomax

Which turbomax, as there a two different models. The more modern one, with the brass CPL diverter valve, located at the front left of the boiler, was very prone sticking & jamming, this would restrict flow through the hot water circuit in the boiler, and cause cycling. Vaillant actually modified the diverter. You can identify, if it is the old type, as there is a very small hole in the middle of the diverter on the old ones, probable no more than 1mm-2mm wide. The modfied one, is much bigger approx 5mm wide. If old type, replace as this usally sorts the problem

Posted on Mar 03, 2009

  • 30 Answers

SOURCE: central heating boiler problem

this is probably a faulty diverter valve. more info needed

Posted on Mar 26, 2009

  • 30 Answers

SOURCE: Vaillant combi boiler problem

when the tap is turned on and the water light on the boiler doesn't this means the diverter valve is not operating it could be down to low water pressure in the house this can be checked at the cold tap in the kitchen. if there is plenty of pressure then it could be the diagphram in the diverter valve is worn or split. the diagphram is only a few pounds but it depends on the engineer you get as to how much money he wants to fit it.
the egg timer symbol (or two pyramids together) is an ignition indicator turn off and on again to see if it will fire with the tap running. reset the boiler with the lower right hand control knob.

Posted on Mar 26, 2009

burty681
  • 56 Answers

SOURCE: i have a vaillant echo

Underneath the unit there are two white knobs with Closed on them. Open the left hand one, then the right hand one, watch as the pressure rises to about halfway up the dark grey area on the gauge. Then close the right then the left knobs.

Press the "-" button next the the radiator control will show the pressure in the system. This should be between 1.0 and 2.0 bar.

Posted on Jan 20, 2011

  • 30 Answers

SOURCE: a have a vaillant ecotec

most likely no. there might be a obstruction in the blades, dirty filter, the motor might have a bad berring , the fan blades might have bent and now are touching the housing prob should call a trained tech boilers aint no joke

Posted on Aug 06, 2011

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