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Hi my vaillant combi gives hot water for only 15 seconds then runs cold turn the tap off, run the water again & gets hot then runs cold some told me it might be the diverter valve can any body help thanks neil

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  • 6 Answers

Yes it is your expansion vessel it sounds under charged to me?your expansion vessel needs to be recharged to 1 bar at least,but check manufacturers instructions it could state different.if the heating is fine and your getting hot water in intervals your diverta valve is moving and working?

Posted on Dec 12, 2012

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Posted on Jan 02, 2017

mrgrzz
  • 88 Answers

SOURCE: Vaillant turbomax 28 constant hot water problem.

got your fix, its a calcium buildup in the heat exchanger, and more than likely the rest of the unit, you will need to flush the unit with about 4 gallons of vinegar, you will need to recirculate it for about 20 mins through the unit, then flush with clean water, hook it back up, it might take a couple of mins for it to run properly, but it will, I have had the same problem with Rinnai on demand hot water systems, and it worked like a charm, check the filter thats inline as well, make sure it isnt plugged, clean if needed, also if you dont have a soft water system inplace, you might want to think about buying one and having it installed, that will reduce this from happening again for alot longer period of time, hope that helps

Posted on Jan 20, 2009

  • 44 Answers

SOURCE: heating, but no hot water on a vaillant turbomax 28 combi

the problem is the diverter valve unit, source a corgi engineer to fit new one, cost for valve approx 80 quid +fitting

Kindly

Richie

Posted on Dec 16, 2008

  • 1 Answer

SOURCE: Combi Boiler - Running warm & then cold!? HELP!

the problem was solved on my system by replacing thermostatic valve on shower and putting non return valves on hot and cold feed to shower . the problem was caused by cold water getting into the hot water line through the shower hope this helps

Posted on Dec 30, 2008

  • 16 Answers

SOURCE: Heating circuit getting hot when hot water is running

Check to see if diverter valve is in domestic mode or heating mode.

Posted on Jul 10, 2009

gasman44
  • 83 Answers

SOURCE: vaillant combi boiler,dirty water comes out of hot

Hi ,

Can you please tell me the model of the vaillant, and the approx age?

I can solve this problem

I await your reply

Thanks

Steve :)

Posted on Jul 16, 2009

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I have main combi 24 if you run water slow it is hot but if you turn it up it is luke warm water


see pic;

Notice the red in the 1st picture? That is all hot water. When you have a broken dip tube the cold water is 3/4 of the water heater.

So like in your case, if you run water slower you may get hotter water longer, but if you run at faster rate, hot water short time and then cold.

Check & if needed replace the dip tube. Easy fix


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Vaillant combi boiler,dirty water comes out of hot and cold taps ,just been serviced by british gas,could you tell me the problem


Hi ,

Can you please tell me the model of the vaillant, and the approx age?

I can solve this problem

I await your reply

Thanks

Steve :)

Jul 16, 2009 | Water Heaters

2 Answers

I have exactly the same problem


you need to change the cartridge, it is a temp control and is going bad so it keeps you from burning yourself it is like a mixing valve and is givng more cold water, that way you don;t get burned,,

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