no ch on baxi 105e

[ccw123]

Good evening,
My 105e DHW is fine but CH is none existent. None of the failure lights are on and the pressure is constant at 1.5 bar.
The pushrods on the diverter both engage the micro switches, so I guess the diaphrams are ok(?), but no CH.
The boiler will not reset when I turn the switch to the reset position so maybe the selector switch is faulty(?)
The boiler is being temporarily controlled by the dials on board until we connect it up to a roomstat after the building work we are having done is finished.
The boiler was here when we moved in so I don't have any info beyond 8 weeks ago.
Any information would be very welcome.
Thanks,
Dave.

 

[baxpoti]

My 105e DHW is fine but CH is none existent. None of the failure lights are on
The boiler will not reset when I turn the switch to the reset position so maybe the selector switch is faulty

A contradiction or confused.com

What lights are on, why are you trying to reset?

 

[fitz1]

check the link next to earth inside is still connected

 

[ccw123]

None of the fault neons are on only the mains power. Hot water and flame indicator when DHW is demanded.
I'll check the earth link.

 

[ccw123]

the link is fine.

 

[ccw123]

I tried to reset just in case a miracle occurred.

 

[ccw123]

I do realise that the link you refer to is next to the earth terminal by the way.
cheers.

 

[baxpoti]

Is the c/h light on?

 

[ccw123]

no

 

[baxpoti]

Is there a built in timer?

 

[baxpoti]

no

Then the primary flow micro switch is not making

 

[ccw123]

No

 

[ccw123]

Hi BaxiPoti,
In your last post did you mean that the primary flow microswitch is not making contact?
Is the primary flow ch or dhw?

 

[baxpoti]

What colour is the link wire?

Underneath the blanking plate for the timer is a terminal block what wires are in here and how are they connected?


Primary = c/h

 

[ccw123]

the link wire is red, behind the blanking plate is a terminal block with a blue wire to the first terminal a red to the second and two black ones to each end of the third