Pulsacoil 2000

Hi,

A customer of mine has a Pulsacoil 2000.
They have recently not been getting hot water from the off peak element. I checked the stat and it was faulty, so replaced for a new one.

Now this element seems to be working (they have said they can hear it) but they've still no hot water.

From reading threads on this site, I gather this could be down to sensors or the PCB.
However, if they use the 24hr element, they do get hot water - so I am confused.

Any advice would be very handy.

Have you tested the Immersion element?

Kind regards

Gary

Mk Group Ltd

Hi,

Yes I have tested the element - all seems okay.

The stat seems to satisfy well before the tank gets hot enough.
I have just been reading another post on this website. They mention that it is fairly typical for the bottom element to be scaled, and so local overheat is possible.

I am going to their house this evening to check that there are no fault lights etc etc.

Any ideas ?

Have you tested the element (18ohms)?

Kind regards

Gary

MK Group Ltd

Hi,

Yes - it was 17. something - cant remember the exact measurement.

Is the lower immersion connected to an off peak power supply or a time clock?

Kind regards

Gary
MK Group ltd

It is now connected to the Off Peak, but previously it was 24hr due to the controller not being programmed correctly.
I can only assume it had been like this for some time.
All has been working well until 3 weeks ago.

They can only get hot water from booster immersion.

I can over ride the off peak to make the lower immersion work, but they tell me they still have no hot water !!

If they are receiving hot water when using the on peak (boost) it can't be a sensor issue, otherwise you would not get hot water at all!

It can only be a power supply / time clock/ immersion element or stat issue to the off peak immersion.


Kind regards

Gary

MK Group Ltd

Assuming there are no faults, and the pump runs (as they get HW using the Peak), the stat is new and works fine, and the element tests out okay, I assume the only thing left is that the element is 'scaley' and is therefore reaching temperature 'locally' but not the whole tank ??

Would you agree ?

what is the maximum stat temperture on the new stat you have fitted? Is it a standard immersion stat you have fitted?


Kind regards

Gary

Mk Group Ltd

I had fitted a standard stat - I am more use to conventional Hot Water Cyclinders.

I have just been back there to have a look (I only discovered this site today), and I have refitted the original stat.
The unit constantly makes a noise of which I cant describe by text. Anyway, I tested to see if the pump ran when you turn on the hot taps, and it only has 50v. This 50v is on/off constantly in time with the above noise.

The pump is spinning, only on speed 3, and the pump unit is roasting hot - yet the pipes are not. I assume the heat is from the pump not working as it should with 230v.

A very small dribble of water came out of both stat housings when I reinserted the stats - but it wasnt running water.

The green light on the front is on faintly - apparently it used to be on bright.
The red light is not on at all.

The red light on the PCB is flashing too fast to count - I would guess at 8 times a second.

Would this point to something on the PCB being wrong, and all this is due to the pump not running as it should ??

We are in West Sussex if you know of anyone who would cover that area to repair this unit !!

Cheers,
Chris

Hi Chris,

Sounds like you have various faults, If water is coming out of the dry pockets of the immersions, they need replacing, water and electricity doesn't mix.

Seven flashes per second of the neon on the PCB indicates that the T1 sensor has failed. (DHW).

What area of West Sussex are you in ?

Regards

Gary

MK Group Ltd

Hi,

I am nr Billingshurst (RH14) - which is near to Horsham.

I appreciate elec and water dont mix - but the water was a tiny amount.

Do you know why the pump would be only receiving 50v - and not constant ??

So the flashing PCB is bad news too then ?!? Not sure how the unit can suddenly develope quite so many faults at once.
To be honest, I am unsure what the advantages are of using the Pulsacoil Heat Stores instead of a standard immersion tank. I have never come across one before now - and at initial inspection, it seems quite complicated for the job it does. I am guessing there is more to it ???

Thanks for your help, and let me know if this is an area you or someone you know can cover.
I will need to speak to the guys that own the flat to then arrange a repair.

Chris

As the DHW sensor has failed the pump will only receive 50 Volts.

Get the owners to call our office and we will arrange an engineer.

Kind regards

Gary

MK Group Ltd

If it is just the sensor, is that something I could replace ??

If not, or if you think it requires more attention, please could you provide contact details ?
Would you also have an approx idea of costs - so I could let them know ??

Cheers,
Chris

Chris,

It is somthing you can do, either call us to book an appointment or call us to purchase parts.

0870 80 31 999

Gary
MK Group Ltd

http://www.mkgroupltd.co.uk/home-page/pulsacoil-information/pulsacoil-2000/

Hi Gary,

I have tried and left a msg. Either call or email me - chrisbryant78 'at' btinternet.com

Bizarrely the customer told me today that she had hot water this morning, but I am yet to find out how much ! I cant believe it is fault free today somehow.

Chris

Hi,

Sorry about earlier - signal was awful.

This is basically the events in order... ish.

The customer said she had no HW.
A colleague went round and changed the stat (for a normal one) as this seemed to be the problem, but it didnt fix it.
We then discovered the Elements had been wired incorrectly (peak/off peak), so changed that, checked the stat and it was fine, so tried again.
Still no joy.
They were however able to get HW from using the 24hr peak element.
Go back again (after seeing this site) and the unit was making an intermittent noise and give 50v to the pump. This did not change if the taps were running, and all pipes were cool (lukewarm at best) to touch. The PCB was flashing 7 times per second approx.
Last night I changed the two stats around, and today they have a tank of hot water. The noise has stopped, and the PCB is flashing twice.
The pump was a no volts, then went to 50v, then to 120v (on a probe meter not a multi meter).
The pump then went back to rest again.

Is this an iffy stat ?
Do you think it is more than this ?

Cheers,
Chris

Standard off the shelf stats only generally go to 70 degrees as the unit is designed to run at 77degrees you require a stat that runs to 80 degrees.

If the unit is not heating to the correct temperatue it, you will get a lower output temperature of water.

However what you have described does sound like you have a faulty stat.

Kind regards

Gary

Mk Group Ltd

Hi Gary,

This unit has been working fine since we last spoke - but has developed a problem again.!
Initially, I thought it was simply due to the whole area having no water (burst main). But the water has been back on for a few days now, and they've a little hot water but not much.

I went there tonight and the pipes and water are both hot - but the water cools quite quickly. The pump isnt running as it should, and the PCB LED is flashing 7 times as before.

Could you provide me with your contact details so I can get them to call you to arrange a repair ??

Cheers,
Chris

Hi Chris,

Call our office 01908 617382 and we will schedule an appointment.

Kind regards

Gary

Hi,

I need some more advice regarding this problem if possible.
The client would like me to replace the sensor, but I am unsure what one it is (on the store itself) or what one to buy (from a website 'segel').

I wondered if anyone had any info on how to replace the sensor too ?? Is it simply attached to the external of the pipe, or does it need draining etc ??

Any help would be gratefully appreciated - they have been without HW for some time now.

Hi all,

I have now seen the unit and its definately the sensor thats the problem. If you wiggle the wire it works again !!
Its the brass 'nut' looking sensor.

Can anyone tell me whats involved in changing this ?? Do I need to drain anything ??

Hi,

I could do with some advice regarding this.

It all works fine again, as per above. But the stat keeps 'tripping out' on its overheat. Probaby about once a week ish.
The stat used to do this and I changed it for a new one (proper one).

Any ideas why it would do this a lot ??