Pump not stopping after boiler (Glowworm Ultimate) stops

[Mel_P]

Boiler is Glow worm ultimate.

Seems to operate correctly and has boiler bypass valve part open

Just replaced electronic time switch as it seemed to have "died".

Thought this might solve the problem of pump run on.

There is continuous mains voltage on terminal "P" of boiler barrier strip.

Shoud this go to 0v after preset time ?

Mel and Matt

 

[gasgeezer]

I believe some ultimates operate pump overun on temp. not timed. which ultimate is it.

 

[Mel_P]

Its a 60FF and the pdf manual (downloaded) implies it operates on time (from the fault finding flowcharts.

How can I tell to make sure?

There are 4 neons and they all work so all should be OK - but!

The flow charts for pump run on imply I need a new PCB - but that's £70 -80

Mel

 

[gasgeezer]

silly question is it fully pumped syst. if it is link between s/l and terminal 9 s/be removed or pump will run constantly.IF IT IS GRAVITY dhw then pump must be wired to control box not pcb

 

[Mel_P]

Hi again - yes it is a fully pumped system and link is not there.

If I disconnect the wire connected to "P" the pump does not recevie power so it is obviously related to this connection.

 

[gasgeezer]

i would go with faulty pcb diagnosis then

 

[Mel_P]

Yes - but £70 is a bit steep !

Thanks for your thoughts.

 

[gasgeezer]

as pcb prices go not that expensive if you have wired in correctly can only be pcb no voltage on s/l but still working pump must be pcb . Replaced one the other day wires every where best to snip old wires and replace new like for like or you will get confused .good luck

 

[Mel_P]

Well....

I emailed Glow-Worm and they suggested making sure terminal "SL" really was at 0v when it should be - otherwise a microswitch fault.

It was at 240V - checked microswitches and one ws duff in that it seemed to allow sufficient leakage to fool the control PCB - replaced microswitch with maplin eq. (£1.75) and this cured problem !

Cheers.

Mel

 

[ChrisR]

You mean the microswitch in the motorised valve?

Ooooo kay, but if SL was at 240v why wasn't the boiler on?

Oi dusent follow.

 

[Mel_P]

Yes.

The pump was on all the time and the boiler did come on ocassionally as the water was being circulated via the bypass loop and loosing heat.

(this is my daughters heating system and as they are out at work / always busy they didn't notice the thing was on all of the time. it was only when I was doing some DIY I noticed the pump was on all day....)

 

[gearcam]

Well....

I emailed Glow-Worm and they suggested making sure terminal "SL" really was at 0v when it should be - otherwise a microswitch fault.

It was at 240V - checked microswitches and one ws duff in that it seemed to allow sufficient leakage to fool the control PCB - replaced microswitch with maplin eq. (£1.75) and this cured problem !

Cheers.

Mel

Can you tell me which microswitch ?

 

[Mel_P]

The one on the timer cam.

 

[PEDANTICVINDICTIVEMAN]

£70.00 for a pcb steep, haaaaaaaaaahhhhhhhhh bump oops fell on floor laffing, your kidding, have you tried buying one for a worcester or an Ideal Eyesore...........