What would you say the best/easiest way is to fault find a sludged up heat exchanger that could be causing no/poor circulation and boiler overheat/lockout?
Sludged up boiler heat ex qustion .....
- Thread starter harryfox121
- Start date
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I was just asking in general, about the main heat exchanger and causing the boiler when on, after afew minutes to overheat/lockout.
sometimes that haopopens when you need a pump.
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I know that, but also it could be down to a sludged up system, as newer boilers have smaller heat ex's and they can get blocked.
About the pump: do you mean the pump failing/slowing...
About the pump: do you mean the pump failing/slowing...
Harryfox121
There are lots of symptoms for a blocked heat exchanger, depending on which heat exchanger, primary or secondry,
For the primary it will make all sorts of banging noises a long time before it gets blocked, bleed a radiator is the water a black sludge or clear,
primary side of secondry heat exchanger, differance in temp between inlet and out let.
Secondry side of secondry H/E. no water at hot taps.
This is why it is difficult to give general information rather than faults on a certain make of boiler.
Dave
There are lots of symptoms for a blocked heat exchanger, depending on which heat exchanger, primary or secondry,
For the primary it will make all sorts of banging noises a long time before it gets blocked, bleed a radiator is the water a black sludge or clear,
primary side of secondry heat exchanger, differance in temp between inlet and out let.
Secondry side of secondry H/E. no water at hot taps.
This is why it is difficult to give general information rather than faults on a certain make of boiler.
Dave
thanks dave18 for your help.
if the secondary heat ex was blocked - on the ch side (not cold going in - hot out) then i've heard the water will run hot then cold hot then cold like that and could even overheat lockout.
if the water slow from a combi was poor it could also be a blocked/part blocked filter/cartridge/poor flow rate.
if the secondary heat ex was blocked - on the ch side (not cold going in - hot out) then i've heard the water will run hot then cold hot then cold like that and could even overheat lockout.
if the water slow from a combi was poor it could also be a blocked/part blocked filter/cartridge/poor flow rate.
yeah i agree. what's your methodical system 
dave18 - what do you mean? I am just interested in learning about boiler's/fault finding. I appreciate your help btw.
I know a bit about boilers and fault finding but not the methodical system/way. I'd like to learn though.
Harryfox121,
To answer that question
If you are not Gassafe registered your fingers should only be touching the user controls or cleaning the boiler casing. Even if its your own boiler Thats the best advice I can give you.
I do not mind giving general information to help people out, but I do draw a line at detailed information on an open forum.
Dave.
To answer that question
If you are not Gassafe registered your fingers should only be touching the user controls or cleaning the boiler casing. Even if its your own boiler Thats the best advice I can give you.
I do not mind giving general information to help people out, but I do draw a line at detailed information on an open forum.
Dave.
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