After water heated and switched off, pump remains running but doesnt heat water. This morning kept running for longer than usual and I had to reset boiler to turn the pump off (as I had to get to work) normally it runs for say a few minutes but today was about 10! Any ideas?
Potterton Suprima
- Thread starter tanyalouise
- Start date
Dear ChrisR,
Our system heats both the heating and hot water is this not a combi? I have no knowledge of this sort of stuff. Also what is failure mode?
Our system heats both the heating and hot water is this not a combi? I have no knowledge of this sort of stuff. Also what is failure mode?
TL - No it isn't a combi, it's a conventional (better!) system.
By "failure mode" I just mean one of the ways it can fail. If the boiler water keeps pumping through the system while the boiler's off and cold, it can cool the hot water cylinder, or rads, down.
By "failure mode" I just mean one of the ways it can fail. If the boiler water keeps pumping through the system while the boiler's off and cold, it can cool the hot water cylinder, or rads, down.
Chris, lets go back to the start (no need to through a 6 
).
I have a Potty Suprima, as the post started, all I said was mine runs on & turns off.
So I am at a bit of a lost as to your attitude.
All I tried to do was advise Tanyalouise, that I didnt think it was a problem.
So if I am understanding you. I also have a problem.
Yes its a bit annoying having the pump running on (as the boiler is in the loft) but reading about PCB on this boiler I think I am lucky.
ps Boiler is 3 years old & has always done this, & the instructions tell me it will.
).I have a Potty Suprima, as the post started, all I said was mine runs on & turns off.
So I am at a bit of a lost as to your attitude.
All I tried to do was advise Tanyalouise, that I didnt think it was a problem.
So if I am understanding you. I also have a problem.
Yes its a bit annoying having the pump running on (as the boiler is in the loft) but reading about PCB on this boiler I think I am lucky.
ps Boiler is 3 years old & has always done this, & the instructions tell me it will.
Sorry Diyisfun, my fault 
, confused you with another questioner, who has a rather high opinion of his abilities, has a combi, and has got himself into trouble by not reading instructions.
His screen name is similar.
I haven't sat and timed a suprima overrun recently, but since I was intemperate with you I have just checked with the manufacturer - the overrun is supposed to be 5 minutes. It's done by timing, and not by measuring the temperature (which would be better).
But it isn't adjustable.
So, keep watching it from time to time, but in view of the cost of a replacement board, you'll have to live with it. That can be the silver lining when the board eventually does fail...
It would be worth putting insulation on the primary pipes, which should be there already but won't be
, confused you with another questioner, who has a rather high opinion of his abilities, has a combi, and has got himself into trouble by not reading instructions.His screen name is similar.
I haven't sat and timed a suprima overrun recently, but since I was intemperate with you I have just checked with the manufacturer - the overrun is supposed to be 5 minutes. It's done by timing, and not by measuring the temperature (which would be better).
But it isn't adjustable.
So, keep watching it from time to time, but in view of the cost of a replacement board, you'll have to live with it. That can be the silver lining when the board eventually does fail...
It would be worth putting insulation on the primary pipes, which should be there already but won't be
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tanyalouise said:
The pump overrun on a Suprima is 20 minutes
Chris - "I haven't sat and timed a suprima overrun recently, but since I was intemperate with you I have just checked with the manufacturer - the overrun is supposed to be 5 minutes. It's done by timing, and not by measuring the temperature (which would be better).
But it isn't adjustable. "
then what they told you is wrong
If its really a fixed time for the over run that the time constant will depend on the remaining capacitance of an electrolytic presumably, which may have dried out.
Or is it set digitally in the processor chip?
Tony
Or is it set digitally in the processor chip?
Tony
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It comes from the processor
and is a pain in the bujur during the test
and is a pain in the bujur during the test
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