Worcester 240 RSF

[John The Rad]

Got called out to fix a Worcester 240 RSF boiler
Symptoms were, Heating but no hot water.
Simple job. Replaced diaphragm. Also replaced micro switch assembly. The old one had a cracked shell.
Now I'm tearing my hair out because the symptoms have now reversed.
Hot water but no heating.
When I call for heat, or re-set, there is absolute silence (no pump no fan no clicks)
If I turn the hot tap on in the kitchen sink, the boiler bursts into life.
Checked the selector switch, that's OK
The Demand light does not illuminate
The fault finder in the manual says "Faulty flow switch" but I can't find a flow switch in this boiler. I don't think there is one.
Any Worcester bods out there who can help ?

 

[Billy Bob Bob]

timer? roomstat fitted?

 

[diamondgas]

If it worked okay befor you touched it then you've probably unpluged something ... Or a Gas man suggests, external controls not calling ...

 

[John The Rad]

The only external control is a Randal time switch, that's working OK (no room stat.)
Already thought of accidentally unplugging something checked everything.
Can't understand why the demand light isn't coming on.

 

[diamondgas]

Link out the external timer at the boiler John then you'll know whether the fault is internal or external ... If you aren't getting a demand light then that says something ... external controls or the selector switch primarily!

 

[John The Rad]

I Downloaded the wiring diagram and spotted the fault immediately.
Anyone still reading this, like to know the answer?

 

[P J F PLUMBING]

Yea yea yea !!! Ha ha

 

[diamondgas]

I Downloaded the wiring diagram and spotted the fault immediately.
Anyone still reading this, like to know the answer?

And the answer is? :yesnod:

 

[John The Rad]

Sorry, just got back to check for postings.
Also a bit ashamed of the answer.
The wiring diagram showed that I had plugged the 6 pin plastic socket onto the board upside down. (it isn't designed to make that impossible)
No damage was possible, fortunately. but all I could get was hot water.
My explanation to the customer (of course) was carefully designed to make me look like an absolute genius in diagnosing the fault.
No harm done and no extra cost, and my lies were little and white.

 

[Billy Bob Bob]

Sorry, just got back to check for postings.
Also a bit ashamed of the answer.
The wiring diagram showed that I had plugged the 6 pin plastic socket onto the board upside down. (it isn't designed to make that impossible)
No damage was possible, fortunately. but all I could get was hot water.
My explanation to the customer (of course) was carefully designed to make me look like an absolute genius in diagnosing the fault.
No harm done and no extra cost, and my lies were little and white.

we all do it the art of lying is another trait we must possess

 

[GrahamM]

Go on John, give us a run down of your explanation to the customer.:yesnod: