Boiler not firing up after changing from rwb2e to a rwb29

[coff]

Hi, I have replaced my old Siemens RWB2E programmer to a new RWB29, but after installing the new unit my boiler is now not firing up?

The CH & W lights are coming on asking for the boiler but it is not coming on, I had to replace the old back plate with new one that came with new programmer and am sure I have wired it up exactly the same.

Wires are as like this in the terminals:

2 blacks into the N
1 red into Live
1 is emty
2 is empty
3 brown into that
4 red into that

and there was a spare blue wire that went nowhere?

Boiler is a Baxi Bermuda back boiler, am I doing something wrong?

 

[D_Hailsham]

Do you have any motorized valves, if so which type and how many?

View media item 11762 View media item 5946

 

[coff]

No dont have any motorised valves, the boiler was working fine till changed the programmer then it just would not fire up.

 

[matt1e]

Hi, I have replaced my old Siemens RWB2E programmer to a new RWB29, but after installing the new unit my boiler is now not firing up?

The CH & W lights are coming on asking for the boiler but it is not coming on, I had to replace the old back plate with new one that came with new programmer and am sure I have wired it up exactly the same.

Wires are as like this in the terminals:

2 blacks into the N
1 red into Live
1 is emty
2 is empty
3 brown into that
4 red into that

and there was a spare blue wire that went nowhere?

Boiler is a Baxi Bermuda back boiler, am I doing something wrong?

Based on the above and your comment that you have no valves
Then I'd say the blue is the supply neutral for the boiler
Are you sure it wasn't connected?

Matt

 

[Weedrip]

The two programmers are not compatable.

Your old one had a 10 / 16 program function for gravity / fully pumped.

The new one is for fully pumped.

They should both have had the same backplate? or so it would seem from the instructions.

 

[coff]

Here is pic of wiring new pic below

 

[coff]

Where would the blue been connected?

Hi, I have replaced my old Siemens RWB2E programmer to a new RWB29, but after installing the new unit my boiler is now not firing up?

The CH & W lights are coming on asking for the boiler but it is not coming on, I had to replace the old back plate with new one that came with new programmer and am sure I have wired it up exactly the same.

Wires are as like this in the terminals:

2 blacks into the N
1 red into Live
1 is emty
2 is empty
3 brown into that
4 red into that

and there was a spare blue wire that went nowhere?

Boiler is a Baxi Bermuda back boiler, am I doing something wrong?

Based on the above and your comment that you have no valves
Then I'd say the blue is the supply neutral for the boiler
Are you sure it wasn't connected?

Matt

 

[matt1e]

Here is pic of wiring

Untitled

• coff
• 25 Jan 2013
• 1

And the connection to terminal 3 is...........?

Also what's with the duct tape, earths?

 

[Weedrip]

If your original description is correct the connection on no4 is for the pump/central heating.

There would / should be a connection on no3 for boiler live supply.

Your new prog will then only fire for hot water. when the heating switches the pump only will run.

Note if you do in fact have any motor valves then then the above could be incorrect.

Given what you have said about the original system [albeit very little] I would suggest you have not rewired as was original there?

no1 is a live when off which is what the brown wire is connect to I would doubt that is correct!

 

[D_Hailsham]

The two programmers are not compatible.

Your old one had a 10 / 16 program function for gravity / fully pumped.

The new one is for fully pumped.

Dipswitch 5, on the back of the RWB29 stat, switches between gravity (down) and fully pumped (up).

 

[coff]

Sorry wrong photo here is the way it is

Untitled

• coff
• 25 Jan 2013
• 1

 

[stem]

Edit ignore the below, OP posed a correction after I had started typing

It's not working because you don't have a live connection to your boiler. Your text is right if brown is the boiler live and red the pump, but your photo doesn't match.

2 blacks into the N
1 red into Live
1 is emty
2 is empty
3 brown into that
4 red into that

So why does the photo show the brown wire going to terminal 1 and not to terminal 3.

Here is pic of wiring

Untitled

• coff
• 25 Jan 2013
• 1

Terminal 3 = Hot Water on (Boiler Live connection)
Terminal 4 = Heating on (Pump Live connection)

 

[Weedrip]

Then alter the dip switch as noted by Mr Hailsham [well spotted there]

the prog will then give you the same functions as was originally there.

 

[coff]

It is still not firing the boiler, here is pic of programmer

Untitled

• coff
• 25 Jan 2013
• 1

 

[coff]

Still not sure if the blue wire should be connected to somewhere?