Main 24 HE combi - Dhw issue

[bassmonster]

Hi all,
I just got back from looking at above boiler.
When running the tap, the water is hot, warm, hot, hot, warm again then hot, lukewarm and sometimes just goes cold. During this time there is no change with the flames.

What should I be looking at?

 

[jefaz]

Thermistors,plate to plate

 

[bassmonster]

That plate to plate looks a pig to get to.... Any advice on this please?

 

[REDSAW]

slap a new p-ex in it and check the inline filters.

 

[bassmonster]

What's p-ex redsaw?

 

[dancinplumba]

P-ex is plate heat exchanger

 

[bassmonster]

Any idea how long it takes to change the plate heat exchanger? The customer Said to let him know if a new boiler is needed... Which is an easy option for me....

 

[Billy Bob Bob]

Any idea how long it takes to change the plate heat exchanger? The customer Said to let him know if a new boiler is needed... Which is an easy option for me....

about 20 mins if your fast and isos work,good access on the 24 HE

 

[bassmonster]

Which part would you put your money on as being the culprit, the primary heat exchanger or dhw plate exchanger? How long to you reckon it will take to replace dhw plate?

 

[townfanjon]

Plate heat ex may clean matey , just source one but dont go buy it, just explain to customer first, if its beyond cleaning then go buy one

 

[bassmonster]

I've never replaced a plate heat exchanger... It's right at the back... How on earth do you get to it? I'm guessing the pump has to come out in order to gain access?

 

[townfanjon]

I aint to clued up on the mains, but they generaly come out ok , have some new seals ready if you take it out for a look. Try get hold of the manu instructions but usualy they are a couple of screws / bolts

 

[Billy Bob Bob]

Which part would you put your money on as being the culprit, the primary heat exchanger or dhw plate exchanger? How long to you reckon it will take to replace dhw plate?

the main only has one,primary ntc,if heatings working ok its not that,symptoms sound like either a plate heat or failing diapragm ,plate heats favourite though ,pump does not come out,give me to secs i will go take a pic of the one on the wall in my kitchen

 

[Billy Bob Bob]

access looks tight but its not,undo both retaining screws,lift it up,tilt it just above the 2 small hydro pipes and it slides out easily

 

[bassmonster]

Thanks for that gas man, much appreciated. In terms of tools, standard spanner?

 

[Billy Bob Bob]

Thanks for that gas man, much appreciated. In terms of tools, standard spanner?

for the plate hex just a pozi driver,its only held in with 2 screws you will also need 4 x 248049,there the washers

 

[townfanjon]

4 x 248049,there the washers

Now thats service !!

 

[REDSAW]

Now thats service !!

not whan you see the price for 4 of them!!!lol
there about £4 each for a rubber polo mint.

ask for the ariston ones there the ssme but cheaper. about £2 each

 

[bassmonster]

I had a look on eBay and I thought £4 for 4 is really expensive and now you're saying they're £4 each??? I'm in the wrong business.....

 

[REDSAW]

I had a look on eBay and I thought £4 for 4 is really expensive and now you're saying they're £4 each??? I'm in the wrong business.....

snap them up.

that price was from plumb center

 

[Billy Bob Bob]

not whan you see the price for 4 of them!!!lol
there about £4 each for a rubber polo mint.

ask for the ariston ones there the ssme but cheaper. about £2 each

there not the same,ariston ones are much slimmer and normally leak

 

[Leo21]

I've never needed new washers on a plate change ever. Just check for obvious dirt particles and grease.

 

[REDSAW]

there not the same,ariston ones are much slimmer and normally leak

sure they said ariston? could be something else but they matched up the same size and didnt leak!!

 

[Billy Bob Bob]

sure they said ariston? could be something else but they matched up the same size and didnt leak!!

there normally thick ones on baxi plates,unless ariston have modded theres

 

[quality]

I buy all my O rings from BSL. They are pennies compared to what manufacters charge. The kits you can buy for a couple of quid are useless in terms of size. the hard bit is organising them. Spec the OD and section they are standard of the shelf stuff