I can see that being true, hope not though as it's pretty counter productive in the long run!
If all those parts have actually been changed, i can't see it going down the rads.
Vaillant VCW GB 242 EH Boiler - Is it Diverter Valve?
- Thread starter trelo
- Start date
I can see that being true, hope not though as it's pretty counter productive in the long run!
If all those parts have actually been changed, i can't see it going down the rads.
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It'll be the elbows cracked on diaphram pump mate they all do it u only getting ignition rate on the gas if u got someone reg to check burner pressure u see
Sorry I haven't been back quick enough... I've not managed to get time to go try NTC disconnection yet... We are managing to get reasonable hot water by turning down the overall flow at the mains for now...but it's ridiculously low now.
Apart from Checking the NTC, temperature check and the Y section.... What checks should i be doing in order of priority next if any? (before i call an RGI)
Apart from Checking the NTC, temperature check and the Y section.... What checks should i be doing in order of priority next if any? (before i call an RGI)
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Sorry I bin readin this thread an there's no other explanation I don't believe the gas rate info it needs burner pressure checking it's common this model
It's usual thing of lookin to deep into somethin u will need a reg Eng to do this as dia pump is in bottom of electronic box an it's a pig to do
Like i keep saying, this needs doing! There's nothing left for you to do, you need an RGI to do this for you.
These are the next checks!
Like i keep saying, this needs doing. There's nothing left for you to do, you need an RGI to do this for you.
Haven't been back for a while but thought I'd update on my boiler. I finally decided to get a competent engineer to have al look at it tomorrow. The problem is still there as per my last post back in March. Not sure what he's gona find... i'll let you know and hopefully this will end months of mystery. Thanks guys
hi.. i'm back!.. still been living with the same problem and when i finally got and engineer to look at it he reckoned it was the primary heat exchanger? he said it was kettling? he hasnt been back yet but wondering if this could be a plausible cause?
I have been reading this whole thread to find some clues for a problem that I am dealing with.
My early thought was that the main HX was not transferring the heat. But the OP said he had changed it but I now think he was only talking about the secondary one.
If Trelo is still around it would be nice to hear what the outcome was!
For the sake of complete information I will explain what happens when the main HX is not transferring the heat.
The burner burns the gas/air mixture in the quantity required to give the right amount of heat. This heat is in the form of very hot gas products of combustion. This passes through the main HX and most of the heat is transferred into the water and these products exit the flue at around 120C in a non condensing boiler like this. If the main HX is dirty on the flame side or dirty inside with oxide and/or lime scaling then the full amount of heat is not extracted and the combustion products exit the boiler at a higher temperature.
A thermal survey would show the temperature of the water at inlet/outlet of the main HX and of the flue gases and will usually quickly indicate if the boiler is operating correctly or not and indicate where the fault lies!
Tony
My early thought was that the main HX was not transferring the heat. But the OP said he had changed it but I now think he was only talking about the secondary one.
If Trelo is still around it would be nice to hear what the outcome was!
For the sake of complete information I will explain what happens when the main HX is not transferring the heat.
The burner burns the gas/air mixture in the quantity required to give the right amount of heat. This heat is in the form of very hot gas products of combustion. This passes through the main HX and most of the heat is transferred into the water and these products exit the flue at around 120C in a non condensing boiler like this. If the main HX is dirty on the flame side or dirty inside with oxide and/or lime scaling then the full amount of heat is not extracted and the combustion products exit the boiler at a higher temperature.
A thermal survey would show the temperature of the water at inlet/outlet of the main HX and of the flue gases and will usually quickly indicate if the boiler is operating correctly or not and indicate where the fault lies!
Tony
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