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hot water coming into cistern

View the thread, titled "hot water coming into cistern" which is posted in Bathroom Advice on UK Plumbers Forums.

M

mrplumberman

i,ve just fitted a new toilet.when you flush the loo the boiler fires up.any ideas?
as the guy is going nuts.
 
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Logically, if all the taps are off and he flushes toilet and the boiler comes on you must have connected it to the hot....

This must be a windup
 
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Way too early for all that saga, mate. TBH I wouldn't pay either! problem needs to be sorted. If there are other issues these need to be discussed first,

Put it another way, if you were your customer would you be happy,
 
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does the bouiler fire and shut down straight away? dose it run for the time the cistern fills?
Can you trace the pipe work from the cistern, thus confirm the it is a cold supply, ie it tees under the floor and up to the basin and cold comes out the basin? turn off isolator under cistern connect hose over bath and turn on, if it runs cold not your prob, if its one of the new float valves they can shut off quite hard which could trick the flow switch to fire! is it a torbeck, did you fit the flow ristricter? Just because next doors is fine means nothing, has he got a full service history for the boiler. if you can prove that the ther is a cold feed to the cistern then that should surfice, as he got you in to do the bathroom, not service the boiler!!
 
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See if you can turn on a cold tap very slowly to replicate the fill valve, I dont fix boilers but does anyone know if a worn divertor will trigger the boiler if a cold is turned on a certain way?

Just thinking out loud really, also maybe crossflow? You've somehow tee'd the cold cistern feed into the hot aswell?
 
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I seriously think you've mixed you hot and colds mixed up mate, you mentioned electric shower earlier in the thread, do the combi fire up when using it?
 
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Before you walk into the customers house tomorrow morning, take a deep breath expect a bit of flack and calmly explain that you've come back to try and sort the issue and that being humpy isn't doing anyone any favours.

Then take your time and work through the suggestions here. When your getting annoyed, stop, take a step back and take your time. If the hot has been crossed with the cold explain how your going to sort it and job done.

IF it is a problem with the boiler explain this to the customer but again expect some flak, even if this isn't your doing (probably isn't) you know you'll get the blame so this will have to be discussed....
 
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mrplumberman said:
yes th whole bathroom was repiped.going back to job tmrw.what wlse can i do?
please help.
Click to expand...

As per steveb hold down float valve and let it run, if it runs cold and stays cold your ok'ish. you could try and snap the taps closed to see if that dose the same! turn off the cold feed to the boiler under it, flush cistern if it fills, not on hot! if you can eliminate crossed pipe work it points to the boiler.

don't you hate days like that, the usual custard quote is "well it was fine before you started" usually followed by "never had a problem before you touched it" closely followed by "why did you get me in then if everything if s fine"

best of luck in the morning let us know how you get on!!
 
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