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Vokera boiler hot water runs hot and cold intermitantly loses pressure

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SOURCE: Loss of hot water

usually with a loss of hot water on a boiler and the heating still works ok means the heat exchanger is blocked and needs replacing or cleaning. it could also be a faulty sensor.

Posted on Mar 26, 2009

PSITECHNICAL
  • 71 Answers

SOURCE: No heating and no hot water, my boiler won't fire up

If there is a hi-limit switch, maybe it's open, reset the switch, and monitor the temperature, if the temp. increases over the set temp. replace stat, and clean lime off from the tank, if does not have a filtering system

Posted on Apr 21, 2009

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There was no hot water so repressurised as the pressure wass low the red light remained on but occassionally when turn hot tap on the green light comes on there is hot water then it shuts down and red...


These sure were not out for long. The bright red button is a pressure release valve which could be faulty hence allowing water to bypass out of the system and not having hot water. Try strapping a bag around the pipe that goes outside and see if it fills with water. To top up your system look on the pipes just below the boiler. There should be a cold filling loop or a connection for one. If not get one from a plumber and ask them how to fill system up, its straight forward enough and your problem should be fixed with this info

let me know if you have further questions

my best to you

Aug 05, 2008 | Air Conditioners

1 Answer

No heating and no hot water, my boiler won't fire up


If there is a hi-limit switch, maybe it's open, reset the switch, and monitor the temperature, if the temp. increases over the set temp. replace stat, and clean lime off from the tank, if does not have a filtering system

Apr 21, 2009 | Air Conditioners

1 Answer

Loss of hot water


usually with a loss of hot water on a boiler and the heating still works ok means the heat exchanger is blocked and needs replacing or cleaning. it could also be a faulty sensor.

Jan 25, 2009 | Air Conditioners

1 Answer

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.

Dec 31, 2008 | Air Conditioners

2 Answers

Vokera option combi boiler seems to increase in pressure until it opens the safety vave ,only when heating is on !


check to see if the expansion tank is completely full of water or isolated from the rest for the system. If full it needs replacing, if isolated (valve turned off to it) then turn it on. When a hot water heating system cannot allow for expansion then the pressure will increase when running until the saftey opens.

Nov 26, 2008 | Air Conditioners

1 Answer

Bled my radiators yesterday, and now the water pressure gauge on the bioler is at zero - it wont start up below a pressure of 0.5. I suspect the boiler is air-locked. Any ideas on how to bleed it?. Its a...


You boiler is more than likely low on water. There is normally an automatic water feed. When you bleed a system the pressure naturally drops but is compensated by additional water feed into system. You have a problem in the pressure make-up water feed to your system.

May 11, 2008 | Air Conditioners

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