Logic Combi ESP1 35 always showing demand for Central heating

[Deleted member 120897]

You currently have your multimeter set to Amps, and more specifically microamps, this could damage your meter. Select Voltage which is the V~ and use the 600 setting (600 is more than 230/240 vac). Yes the reading should be zero Volts, testing between the orange and blue.

 

[theboyroberts]

Thanks Undertrained.

Tested the connection and 0 volts when thermostats are off, and just under 240 when they are on.

I'll take a look at the wiring in the boiler now.

 

[John.g]

I'm a bit slow electrically so can someone point out the actual colour codes from the (any) zone valve and point out clearly which are the permanently wired ones for supply to the microswitch and also the wires connected to each microswitch out, both orange wires appear to be connected together in one connector block, I can see the two brown wires separately connected into the blocks so presume that they are via the roomstats and drive the motors?.

 

[Deleted member 120897]

I'm a bit slow electrically

You and me both

However, I’ve just noticed the usual permanent live (grey) is connected to what is usually the neutral (blue)? seems Incorrect imo.

 

[theboyroberts]

Just opened the boiler front up and I've found that the room stat link is still hooked in using the standard pre-installed wire, so it's always going to be on regardless of what the rest of the system is doing.

I see that there's a connector block in the local fused spur which is connecting the black wire from the thermostat circuit to the wire connected to the boiler. This black wire is taped off at the boiler end. Do I simply need to connect this wire to the room stat connector using another piece of wire and a connector block to make the circuit?

Cheers

Shaun

 

[Deleted member 120897]

Post #3 conclusive then? #smug I would be contact them to find out why the link was left in and room stats not connected , unless you know of any other reason?

 

[theboyroberts]

It’s a new build and I’m the first owner, so this is how it was installed.

I’ve already been in touch, but I’m not expecting them to offer any help.

What can I do myself to resolve?

 

[John.g]

Just opened the boiler front up and I've found that the room stat link is still hooked in using the standard pre-installed wire, so it's always going to be on regardless of what the rest of the system is doing.

I see that there's a connector block in the local fused spur which is connecting the black wire from the thermostat circuit to the wire connected to the boiler. This black wire is taped off at the boiler end. Do I simply need to connect this wire to the room stat connector using another piece of wire and a connector block to make the circuit?

Cheers

Shaun

This "black wire from the thermostat circuit", is it live with either one of the stats calling and is it dead only when both switched out?.

 

[John.g]

You and me both

However, I’ve just noticed the usual permanent live (grey) is connected to what is usually the neutral (blue)? seems Incorrect imo.

I was looking from left to right, so 9&10 or 3&4 from right!. the two orange wires from micro switches then to the boiler via black wire, so replace link with this? as suggested.

 

[theboyroberts]

I suspect it will be as I tested it at the valve end.

How do I test this at the boiler end? Would i attach the multimeter to the black wire and then one onto the blue neutral?