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Hi Chris, Just thought I'd let you know that I think I've solved the problem! I tested the electrolytics on the PCB and they all tested fine. However, when I took the two 12V relays out of circuit and tested them using a 12V DC supply and an ohmeter, I discovered that one of them wasn't...

Hi Chris, Ok, I will check the electrolytics. I have an ESR meter at work so can test them with that, after checking that they are discharged of course! :wink: Interestingly, last night after the system had been switched off for a while, I tried powering up the boiler again and it worked...

Hi, thanks Chris. I am actually an electronics engineer by trade, although I also dabble in electrics quite a bit as part of my job. Anyway, I have removed the PCB and will check out what components I can with a multimeter to see if I can find anything obvious wrong. I have heard that the...

Hi There Agile, I have checked and there is no power to the fan when heating is switched to constant even though I hear a relay on the PCB switch as soon as I switch to constant mode. My question is, could a blocked venturi prevent the PCB from applying power to the fan, or should there at...

Hi There, Have just checked operation of the aps micro switch and it appears to work fine. I've check both the NC and NO terminals. Any ideas?? I have a feeling I'm moving towards replacing the dreaded pcb, unless I can find a fault elsewhere. Could you explain when and how the aps is...

What's the best way to check for correct operation of the aps? I have removed it from the boiler, making a note of where the pipes and connections go of course! :)

Hi There, I have checked the fan and it doesn't spin when there is a call for heat, thus resulting in the Fan/Flue fault led flashing. Could this be due to a faulty aps? Am just about to check it out of circuit for continuity.

Hi again, I have removed the 4 screws from the inner door panel but it doesn't want to budge. Any ideas?? Obviously, I can't check the fan until this comes off.

Hi baxpoti, Yes, I reset the boiler and it worked ok again for about 10 minutes and then the fault reappeared. Should the fan be on all the time? I will take panel off and see if it is running and also check to see that it is receiving power. Just need to know whether it is supposed to run...

Hi There, I have just attempted to run some hot water from a tap and noticed that the water wasn't coming through hot. I then checked the boiler and found the above led is flashing? Any ideas on what I could check? Could it be a loose connection on a sensor or something? Please help as...

So basically, I need to replace the entire assembly at a cost of around 80 quid, even though a small o ring is probably all that's gone, at a cost of a few pence. Blimey, life really does suck sometimes! If anyone can sell me just the offending part then I'd be most interested. I have already...

What's the difference between part number 248061 and 248062 then? Many thanks for your help. Rob.

Baxpoti, I have already replaced the DHW diaphram. That went in July time last year. Do you know what the going rate is for the Diverter Valve Assembly then, just so I know I'm not paying through the nose for one? Thanks, Rob.

Hi Everyone, thanks for the replies so far. I am not losing pressure according to the gauge, which made me assume it wasn't system water that was leaking, as I would have expected the pressure to drop slowly but surely. Is this assumption correct? Agile, I know what you mean about...

Hi There, I have a baxi 105e boiler and have recently noticed a minor leak. It is where the diverter manifold assembly is, and appears to be coming from a hole near where the two grub screws are that secures the diverter valve assembly to the manifold. Does anyone know what part is...

Thanks jj4091, I have some heatshrink tubing at work of various sizes so will use some of that then. I just wanted to know if there was a 'recommened' standard way of repairing conductors with minor damage to the insultation. Cheers, Rob.

Hi there, A friend asked me to take a look at a problem with the wiring to his bathroom light. Basically, it keeps popping fuses at the main distribution board. I unscrewed the ceiling rose and on closer inspection noticed that the insulation on the conductors had become damaged, causing...

Hi namsag, Yes, just realised that after looking at one of the wiring diagrams in the baxi service manual- silly me! :) Can't believe I didn't notice that, but there we go! :) I will loop the two black wires together now. Many thanks for helping someone who has just had a senior...

Hi namsag, No, I've disconnected the internal clock. Should I have left it connected and set to constant then? I didn't think the internal clock would be needed anymore.

Hi There, I've just wired the controller up to the boiler, with connections as follows. Boiler Terminal 1 to ST6100 terminal 1 Boiler Terminal 2 to ST6100 terminal 4 L and N on Boiler to L and N on ST6100. Switched unit on and display flashes and enables me to set the correct...