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Sorry but I can see now how my post could have been taken two ways.. There is actually two separate T and Es from the existing switch position, one to each CU. The neutrals are linked at the switch as it is only a single pole switch (like a two way light switch). I ha e orders a Horstmann E7...

Hi chaps, I wonder if anyone has come across this before. Customer has two old wylex fuse boxes with rewireable fuse, one board is for lighting, socket outlets, cooker etc and the other is economy 7 for immersion heater and storage heaters. Customer wants both boards replacing but the previous...

Filter and pump

It’s fixed, went back today and measured the fuel pressure. It was running at 105psi which is a little low so I stripped the pump and found a large deposit of something in the filter. cleaned the pump, put it back together amd it was then running at approx 117 psi, reset to to 110 and it’s now...

That picture shows the de aerator amd you can see the oil level just above the red label bit that is significantly lower than the tank level.

To be fair it wasn’t the customers fault, she initially suggested Sunday but I wanted to have a quick look at the layout first. The fire valve isn’t leaking but it was very difficult to reset, I had to prise the know back up. Before I did that there was no il flow from the outlet of the de...

Very probably the plate heat exchanger and and as far as I recall it’s quite a difficult job on that particular boiler.

Thanks for all the advice chaps! unfortunately the customer could only give me 20 minutes to do an initial test but I did replace the solenoid coil, checked the filter at the tank and reset the fire valve. I also replaced the control box (830.3) with a spare one that I carry. I am going back...

My apologies, I should have given more detail. The fire valve is a Tesla TFV66030, the boiler is an old Trianco Eurostar and the burner is a Eurostar WM50/70. It somehow feels like fuel starvation because the boiler fires and runs but only for a few minutes. The is a de-aerator fitted as well...

Thanks and you're right, apparently that is a common problem but I have replaced the coil with a brand new one, interstingly the customer had a coil replaced recently which solved a similar issue and he left the old one there. All three coils measure the same value (approximately 2k) but the...

I’ve been to a wall mounted oil boiler today, customer reported lock out issues. I attended and found that the fire valve knob had accidenatlly been pressed, I suspect a child had stood on it! Reset the fire valve, bled air out of the oil and the boiler fires up but only runs for about 2...

Thanks for the comments chaps, it is an interesting subject. I measured the resistance with a Fluke MFT set to low resistance. The breaker is a Schneider NSX 100F.

You’re right chaps, my maths was a bit out!!! Do you know if some breakers do trip on phase imbalance though? something in the back of my mind tells me that such breakers do exist. I will check it on Monday once I can get the model number.

I agree about the inrush being a possibility but surely the resistance will lower than the impedance or have I got that wrong lol!

It is an old 400v welder, I measured the resistance of the transformer primary at about 20 ohms so it should only be drawing about 8 amps and it’s a 63 amp breaker.

We have a single phase welder which we want to connect to a 3 phase welding socket. The socket has an integrated RCD and is wired back to a 3 phase breaker. we have connected the welder across 2 phases but when we plug it in it immediately trips the breaker. Do 3 phase breakers trip on...

It should. The 9448 like most panels can be programmed to silence sounders after a pre-set time. This is to prevent noise nuisance. What has probably happened is that the alarm has activated via the panic button, the panel has timed out (it is supposed to) then the user has entered her code...

You said in your original post that the lady needs the alrm to work for when she goes out, on this basis she must know the user code because without it she wouldn't be able to set the alarm anyway.

There is a way to reset it but not without the user code. Once the user code is entered it will reset, on a 9448 panel the engineer code is not required but you do need a valid user code which the householder should know.