Glow Worm Combi 100e

canaries · 21 Nov 2009

I replaced the automatic vent as it was seriously leaking, but since then I have had major problems. Presently after switching on the boiler and without any demand the boiler fires up, I presume over heats and locks out. I have disconnected all the pressure switches, pump, diverter switch gas valve and thermistors (one each at a time) and the lock out still occur, even without ignition.

Where do I go from here? Could I have damaged the pcb? Or best call an engineer.

glasgowgas · 21 Nov 2009

canaries said:
I replaced the automatic vent as it was seriously leaking, but since then I have had major problems. Presently after switching on the boiler and without any demand the boiler fires up, I presume over heats and locks out. I have disconnected all the pressure switches, pump, diverter switch gas valve and thermistors (one each at a time) and the lock out still occur, even without ignition.

Where do I go from here? Could I have damaged the pcb? Or best call an engineer.

are you a gas safe registered engineer??

canaries · 21 Nov 2009

Only electrically disconnected. I know I am not qualified to do and have no intention of doing any gas work. I shall call the professionals for that.

Hugh Jaleak · 21 Nov 2009

Do a search on here for gas4you, (Dave). He's in your area I think should you need someone to look.

ollski · 21 Nov 2009

usually on these the dhw flow switch microswitch is full of water shorting across and keeping a permanent demand on for hot water.

gassafeman · 21 Nov 2009

glasgowgas said:
canaries said:

I replaced the automatic vent as it was seriously leaking, but since then I have had major problems. Presently after switching on the boiler and without any demand the boiler fires up, I presume over heats and locks out. I have disconnected all the pressure switches, pump, diverter switch gas valve and thermistors (one each at a time) and the lock out still occur, even without ignition.

Where do I go from here? Could I have damaged the pcb? Or best call an engineer.

Click to expand...

are you a gas safe registered engineer??

As far as ollski's concerned, its ok.

Paul.

canaries · 21 Nov 2009

I had previously taken the dhw switch out, operated it and it seemed to work ok but the boiler still lit up with no obvious demand. I have just disconnected the inline connector and the fault dissapared!! I do recall that the hot water light used to dimly glow without demand, maybe this was prior indication that the switch was on its way out.

Ollski thank you very much for your advise. I shall con check the switch and get it replaced. Hopefully all will go well

You have saved me quite a bit on a pcb, which I thought was causing the problem

ollski · 21 Nov 2009

If it is definitely closed circuit it will be because the spindle is leaking which pushes the microswitch, you'll need to replace this brass housing cover too.

canaries · 21 Nov 2009

I actual;ly changed the brass cover and diaphram last year as it was leaking. It must have taken all this time to create a short cct within the switch.

Thanks again

diynot

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Glow Worm Combi 100e

gassafeman

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