Worcester 35cdi - No CH but hot water ok?...

[jurassic86]

hi guys
noticed the other day that hot water seems to work fine but boiler will not respond to call for CH.
when i click for ch i hear the diverter valve moves and what sounds like a relay clicking but no heat and burner doesnt seem to fire.
if i restart boiler a few times it works ok after siphon mode is finished.
any ideas

 

[jurassic86]

Hi Gents,
OK I have an update.
I have checked the programmer and when it clicks on power is present on the FR terminals inside the boiler control panel.

I also went into the engineer menu to look for the last fault code which was E9.

I researched E9 and it shows as "overheating". The boiler certainly doesn't seem to give any indication that it is overheating but the digital readout is reading 89/90 at times which I do not recall it going that high before? Maybe just me...

Finally i have checked the pump and unplugged it from the board and the cable going into it is live. No idea yet if the actual pump is working or not but feeling the outside of it is certainly is very hot...

Any other things I can check?

 

[Agile]

A very hot pump is usually one that is jammed and not turning!

See FAQ for what to do next.

Tony

 

[jurassic86]

Thank you
Would all the hot water and rads get warm even if the pump is jammed?

 

[Agile]

No, they would not.

So the pump may be turning but not at full speed.

See the finger test!

 

[jurassic86]

It's as if once heating has been on it turns off and won't come on again until a reboot.
Is it worth a reset from the engineer menu?

 

[jurassic86]

Hey Guys,

Spoke to Worcester this morning- seems as if the PCB is gone.

*Sigh*.

Bloody electrics.