worcester 35cdi boiler problem

[rustysul]

My boiler was working fine! then i had a plumber in to fit a new sink in a room downstairs, He fitted a T junction into the hot water pipe feeding my kitchen sink. this pipe then runs over the top of kitchen units into a toilet washroom and feeds a sink.
since this work was done we have problems with the boiler providing hot water, if we run the tap and turn the boiler off then on again it fires up and water is hot!
any help would be much appreciated

 

[JohnEBoca]

Is the tap on the sink a Monoblock Mixing Tap. [/color]

 

[cider]

prob the diaphragm washer gone in the divertervalve and plumber turning water off and on made it fail a few days before it was going to anyway. call a boiler fixer

 

[undercover]

if we run the tap and turn the boiler off then on again it fires up and water is hot!
any help would be much appreciated

turning the hot water tap on will make the boiler fire up and give you hot water.....

 

[nickso]

prob the diaphragm washer gone in the divertervalve and plumber turning water off and on made it fail a few days before it was going to anyway. call a boiler fixer

35cdi doesnt have a diaphragm or diverter.

 

[nickso]

if we run the tap and turn the boiler off then on again it fires up and water is hot!
any help would be much appreciated

turning the hot water tap on will make the boiler fire up and give you hot water.....

i think he means it will only run if the power is turned off and on again.

 

[DP]

I think the moderator will be asking YOU questions if you do not stop using blue text.

Why would a monoblock sink tap make a difference? Both hot and cold are at the same (mains) pressure.

 

[ChrisR]

35cdi doesnt have a diaphragm or diverter

.

Some did - "35cdi II" weren't they? The ones with only one pump.

 

[mickyg]

Its all well and good guessing at the problem, but lets face it the original post is confusing and barely makes sense.
so to rusty
What happens when you just turn on a hot tap if anything?
Is it the same result from all hot taps?
Does the heating work ok?
How exactly do you get it going again?

Also a GC no. from your appliance data badge will help us know for sure what model we are dealing with.

 

[gremlin16]

Some did - "35cdi II" weren't they? The ones with only one pump.

Correct Chris.

Don't bother changing them anymore, just pass it on to WB.

 

[ollski]

Don't bother changing them anymore, just pass it on to WB.

I thought worcester wouldn't touch anything over 10 years old.

 

[gremlin16]

WB 35Cdi 11 were produced from September 2001 onwards.

The 2 pump boiler was a 350 and production ended July 1998.

Not sure what boiler rustysul has?

 

[rustysul]

sorry my question was a bit confusing!
The boiler will not fire up running hot water from any sink or bath, but if you run the water and turn the mains power switch off then back on again it fires up.
the new sink does have a mixer tap (not sure what make) But since the the mixer tap has been fitted the tap in kitchen has much more water pressure than before we tapped off with the T junction.

Please reply your advice appreciated

 

[rustysul]

yes monoblock mixer fitted.
also c/heating working fine

 

[JohnEBoca]

sorry my question was a bit confusing!
The boiler will not fire up running hot water from any sink or bath, but if you run the water and turn the mains power switch off then back on again it fires up.

The HW pressure switch maybe at fault, clean or replace.