combi boiler

[Snowbunting]

need help with a worcester combi boiler 29CDI. Quaified electrician and have fitted a ESRTP4RF+ to my own boiler all linked and calling for heat but boiler wont respond , works ok with water. Cheers folks in advance for your help.

 

[Madrab]

Have you either powered the stat form the FCU and then linked the L to COM(1) in receiver and then 2 > LS on ST10? - or fed the receiver from the boiler L (linked COM to L if) and then connected ST10 LS/LR/N directly to the COM/2/N on the receiver. Also removed link wire from ST10.

If you have done either then no reason it shouldn't run unless there's a problem in another area. Check for 240v on LS when receiver calling.



BTW, that boiler has a room sealed case and it shouldn't really be off and DIY'd unless it can be properly tested afterwards!

 

[fixitflav]

need help with a worcester combi boiler 29CDI. Quaified electrician and have fitted a ESRTP4RF+ to my own boiler all linked and calling for heat but boiler wont respond , works ok with water. Cheers folks in advance for your help.

Did it work before you fitted the ESRTP4RF+?

works ok with water

Do you mean it produces HW OK?

 

[Snowbunting]

All wiring as per your information connection correct however this is not a sealed case no seals just 4 screws. Thanks for your reply hopefully its something simple.

 

[Snowbunting]

Fires up on call for hot water no issues.

 

[Madrab]

this is not a sealed case no seals

Is the boiler is a CDI 29 Classic (GC 47-406-65)? I believe that's the only CDI 29 combi that WB do.?

 

[Snowbunting]

yes spot on wired many systems over the years Y plan S plan etc and replaced controllers never had a problem till i replace my own

 

[Madrab]

OK - unfortunately if it is the 29 CDI classic and it looks like the pic below when the case is off then it is definitely a room sealed case.



As far as the wiring is concerned then it is just a one SL from the receiver to the boiler, so is the boiler getting 240v @ the LR when the stat calling for Cent Heat? No zone valves or anything involved?

 

[gas112]

what was the existing clock and roomstat you fitted it in place of
original clock fitted to boiler ? depending on how you have wired it up this may need putting to constant

 

[gas112]

to check its not wiring fault link terminal 1 and 2 on esi back plate heating should fire