What sort of tradesman do I need - a heating engineer or an electrician?

missbunbury

Pics of fusebox, immersion switch and heating controls here

http://s1209.photobucket.com/albums/cc390/missbunbury1/

gas4you

As the fault is on the heating system, I would recommend getting a trusted heating engineer rather than a sparks.

I also agree that the pump would be prime suspect.

warmgas

As Canucklehead and Gas4U have said it's more than likely that the pump is the prime suspect.

missbunbury

Thanks everyone for your advice - I have booked a central heating engineer to come out on Thursday so fingers crossed it's something nice and simple - and cheap!

ormus

the immersion heater element must be the prime suspect.
its highly unlikely that no immersion is fitted.

easy enough to check by isolating the wires to the immersion element and trying the switch again.

gas4you

The immersion would be on a seperate mcb to the heating system at the consumer unit.

OP has stated it is the central heating mcb that is tripping.

aboard_epsilon

maybe there isnt enough mcbs in the consumer umit to do that ..
there are only four .

all the best.markj

missbunbury

gas4you wrote: »

The immersion would be on a seperate mcb to the heating system at the consumer unit.

OP has stated it is the central heating mcb that is tripping.

Yeah I've been experimenting with this - if all switches are off when I put the fuse back, then it's the controls on the timer unit that trip it. If however these controls are already on, it's the immersion switch that trips it, so I suspect they must both be wired to the same thing.

gas4you

Ok then, I take back my previous comment now we have more info.

In this case get a sparks in to check the immersion and its thermostat.

Canucklehead

Hi,

I'll be interested to know the outcome .
C/H should have a supply fused at 3 amp so that needs addressing if it is supplied from an immersion circuit.
Not sure if there is an immersion heater wired in, it's all a bit odd.
The switch in the photo is one in and one out, so where does the C/H get it's power?

GSR.