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Wall boilers
How to test if a thermistor of a rock boiler works?
367
hace 5 años
hace 5 años
[b] Good morning:
I HAVE A BOILER: ROCA P 30/30 R.
It didn't work well.
I changed the two thermistors - (sanitary water and heating).
Now the boiler works well.
I presume that ONE OF THE TWO thermistors I replaced was defective and the other was not defective.
You don't get new.
I would like to keep what would be in good condition, for the future.
My question:
How are thermistors tested, to know if they are in good condition, or in poor condition?
Thanks - sds.
CANASTRACCE. [/B]
367
hace 5 años
Hello, I measured with tester, the 4 thermistors that I had told you:
TERMISTANCE 1:
cold, at 20 °: 10.30 ohms, and hot, in water at 90 °: 0.68 ohms.
TERMISTANCE 2:
cold, at 20 °: 10.25 ohms, and hot, in water at 90 °: 0.69 ohms.
THERMISTANCE 3:
cold, at 20 °: 10.63 ohms, and hot, in water at 90 °: 0.71 ohms.
TERMISTANCE 4:
cold, at 20 °: 9.95 ohms, and hot, in water at 90 °: 0.71 ohms.
Please: which of these 4 are good and which are bad?
Thank you,
Sds. cords
CANASTRACCE.
23.097
hace 5 años
They are all good, the values have a tolerance of 5% that is typical in these components.
The origin of the fault could have been a false contact, or dirty or sulphated contact, something that by changing it was obviously resolved by having removed the connectors
367
hace 5 años
Thanks calef. MDQ - I understood very well.
Now: when it means that there was “a false contact, or dirty, or sulphated contact”, it refers to the male and female terminals in the “plugged in” of the two wires that come from the boiler, with the two vane terminals What does each term have?
(C / Termis. It has 2 male terminals, mini vane type, and the cables that come from the boiler, have 2 female terminals also mini).
On the other hand, when I took them out, I saw that the inner tip that touches and censores the hot water was somewhat sulphated.
This makes it malfunction?
thanks - sds. - CANASTRACCE.
23.097
hace 5 años
These terminals are called "faston", and if you start to see, where it makes contact (a kind of slider on the sides of the terminal) there is usually sulfate, another "tip" is that, in the case of reinforced cables in a factory, they do not peel but the terminal has some nails that pierce the insulation of the cable and make contact, well, the water (which is always present in a boiler) gets into those holes and sulphates inside; solution: strip the cable and solder them to the connector; that's the matter
Regards !
367
hace 5 años
good morning - - I will abuse your wisdom - - I have found that you know a lot about this topic - - it occurs to me that some other solution would be to submerge the thermistor and the tips of the two female terminals, inside a small pot of boiling water - - I guess I would take away the sulfate,
on the other hand I find no explanation that by changing them, it was solved- (except that the only thing that was sulfated was the male terminals, because the female terminals - (that the cable is coming), I didn't touch them - - continue ...
367
hace 5 años
I'm taking extreme precautions, in case it happens to me again - - it turns out that I had two new thermistors bought two years ago, spare.
I wanted to buy again and they don't get any more, for this boiler model - - nobody has them - - I stirred the Argentina ... ha ...
By the way: Do you know of someone who can sell me some others to have spare?
thanks - - very kind - - sorry for such annoyance.
sds. cords
CANASTRACCE.
23.097
hace 5 años
hace 5 años
Hi
very simple, you only need a resistance scale tester and measure if the resistance varies when you apply heat (for example with hot water) you should lower the value
If the resistance does not move in value (at 20 ° it must give about 15 Ω) or it does not mark anything, or it marks very little it is because it is defective, I try them before changing them since its cost is important as to walk changing them of taste .
Regards !
7.114
hace 5 años
hace 5 años
Hi CANASTRACCE:
Apart from CALEMDQ recomensdaciones, if you measure well in cold you should try to heat them and sometimes they open hot.
LUCK
367
hace 5 años
MANY THANKS TO HEATING MDQ, AND WALTER.
VERY KIND.
I apologize, but I understand.
My question now:
I have the thermistors now, outside the boiler.
so :
if I measure it with the tester so that they are good, how many kilo ohms would they have to measure dry ...?
If then I only immerse the sensor sensor tip in boiling water - (100 degrees) and wait a while, how many kilo ohms would they have to measure if they are good?
thanks.
sds.
CANASTRACE
367
hace 5 años
hace 5 años
THANKS TO EVERYONE.
VERY, BUT VERY KIND !!!
I GO TO REMAR, MEASURING THEM.
AFTER I TELL YOU. . .
Apologies for the annoyance.
SDS CORDS
CANASTRACE
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