vaillant turbomax 824e

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boiler heating works when you dont want it to. hot water comes through for about 10 secs then stone cold, green light flashing on control panel , any advice please would be grateful..cheers
 
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sounds like a diverter valve problem,
how old is the boiler?
green light flashing indicates warm start is selected.

more information please.
 
Green light flashing indicates water is being drawn!


boiler heating works when you dont want it to.
Explain please. We can't guess what you mean.
 
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could be a faulty aqua sensor or hall sensor best to get vaillant in 195pound covers all parts and call out fee
 
Bahco said:
Is the boiler pressure at 1 bar? :D

pressure is ok... boiler fires up when calls for hot water and stays fired up.but still no hot water
 
bobw1956 said:
sounds like a diverter valve problem,
how old is the boiler?
green light flashing indicates warm start is selected.

more information please.

the boiler is 4 years old.. she stays fired up when hot tap running but still no hot water...
 
bobster said:
Bahco said:
Is the boiler pressure at 1 bar? :D

pressure is ok... boiler fires up when calls for hot water and stays fired up.but still no hot water

So presumably the heat is going round the heating circuit?, in which case its a diverter valve problem
 
ollski said:
bobster said:
Bahco said:
Is the boiler pressure at 1 bar? :D

pressure is ok... boiler fires up when calls for hot water and stays fired up.but still no hot water

So presumably the heat is going round the heating circuit?, in which case its a diverter valve problem

this is true.. you reckon diverter valve..cheers :
 
could check the aqua sensor first
press i and + button together to access diagnostic mode then select d.22.Open a hot tap and a display of 1 means it senses water flowing, 0 means it stopped.

To check the diverter valve actuator remove it and see that the pin retracts for ch and extends for hw. It will always rest in the last demand position.
The diagnostic check for diverter is d.35 then i:
1 hot water
0 heating
2 mid position frost protection
This only reads the pcb commands though and not a sticky valve.
 
Didn't know about the middle position!

Surely that comfirms my conclusion on how the motor works Chris?

Tony
 
Boiler operating on PREHEAT for hot water.
As good colleagues pointed out, faulty diverter valve probably, normally a swollen ball inside, only option is to change it.
Turn the Hot water temperature knob right round to the left, and back round to the right, and this disables the preheat until diverter valve can be sorted. To turn preheat back on, turn hot water knob right round to the right, and back again to your desired setting. Bit like opening a safe I suppose. Not that us gas men (sorry heating engineers) have a need for a safe that is,

You pay peanuts, and you get monkeys................
 
Ollski could probably have said remove the diverter valve and then watch to see if the ball moves as expected from the pcb commands.

If the ball is spherical then its the old stickey model!

The later ones have a rugby ball shaped "ball" !

Tony Glazier
 

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