Pump on all time and system need reseting

[tfheung]

Hi,

I have two problems with my cental heating system. Not sure are they related or not.

My house and so is the heating system is just over 3 years old. It is an unvented system, i.e., got no cold water tank and an air pressure drum. The boiler is Potterton Suprima and using Potterton control.

1st problem is from time to time, my boiler went dead which require resetting. Very easy as there is a button for that purpose. It happened rarely until about 2 months ago. It kept need resetting. Sometimes twice a day. After about 2 weeks, it function as usual again. I am a bit concerned on the source of the problem. One thing I notice is the pressure gauge shown 2 bar, where a red needle is, when the heating is on. Is there anything wrong with this and what may be the cause for the need for resetting?

2nd problem is I notice recently (not sure was it there before) the circulating pump is ON all the time, irrespective whether the heating is on or off. I can always hear the pump is on as the humming noise is very noticeable. But I always assume that is normal when the heating is on. Only yesterday, I noticed the humming noise was there in the middle of night. So I looked at it this morning and noticed that noise is from the circulating pump. There is setting between 1 to 3. It was on 3. The noise is a lot less when I switched it to 2, but it is still there. And the pump is touching hot too. Is is normal for the pump to be on all the time? I can't quite see the reason behind it.

Your help on this is much appreciated.

Freddie

 

[ChrisR]

Either the pump's wired wrongly, which will make the pcb lock out but PERMANENTLY, so unlikely
Or the PCB is knackered. Lots of posts on Suprima pcb's

 

[keego]

If it's locking out & the pump is on all the time then it's the PCB AGAIN!!.

 

[tfheung]

Thank you guys. Talk about joining the club!

I went to press the reset button and the pump has now stopped. Finger X the heating is coming on later.

So I can try to buy a board from eBay and that should solve my problem. Accoring to other thread, the parts number is 5111603. Is the PCB usable for all different models? My boiler is Surpima 50.

The next question is, how can Potterton survive at all by selling dodgy boiler? And why developers even consider buying thier boilers en mass when there is such a well known problem, bear in mind they need to fix it when the fault is known within the warranty period.

 

[kevplumb]

there isnt a problem ask potterton

e mail chris r he might have one