Got a problem with my toilet, in that when you press down the handle it
doesn't flush. A bit of water comes through and thats it. To get it to flush
properly you have to keep pumping the handle until eventually it flushes.
Will the whole flush mechanism have to be replaced, or could it be just a
seal gone or something?
Also, the cistern is one of those ones that sits directly onto the pan. Will
this make taking the flush mechanism to bits difficult?
Is the water level in the cistern correct? Low water level can make flushing
Next stage will be to consider replacing the siphon diaphragm. Others more
expert than I will advise or point you to a solution
On Oct 25, 7:01 pm, "Dark Angel"
Hi,the diaphragm will have perished.this usually comes on slowly, and
results in you having to "pump" the handle a few time sfor it to
If you are remarkable lucky! , the syphon wil be a 3-part one and you
can unscrew without having to remove the close -coupled cistern off
the wall. All the diaphragm amounts to is a piece of stiffish flexible
plastic,. they cost maybe 50p, if you have a rubble sack about you
can cut one out of that. Diaphragms , come in either circles or
enlarge lozenge shape
In an earlier contribution to this discussion,
Replace the whole syphon unit - they're only a few quid - See
'm not sure that they come apart non-destructively anyway - and it's not
worth frigging about with it.
You'll have to turn off the water and disconnect the feed and overflow from
the cistern, and then remove the whole cistern from its fixing on top of the
pan. This then gives access to the big plastic nut which fixes the syphon
unit to the bottom of the cistern.
Make sure you replace the doughnut-shaped seal which fits between cistern
and pan. If you put the old one back, it will most likely leak.
Assuming the water level is high enough as John said, and that the flush arm
is connected to the siphon, its probably the siphon diaphragm.
Have a look here
standard cistern siphon. Two common sizes, measure the old one, if in doubt
buy the smaller one.
The bent wire bit should be attached to the flush handle.
In the bottom is a plastic diaphragm which is probably split. Replacing it
involves removing the cistern. You can just buy the diaphragm but I always
replace the entire siphon just in case its split. Same labour for either
job. Diaphragm is £3 in Wickes, complete new siphon is £9 - do the math.
To remove the cistern, turn water off, flush loo, bail out any remaining
Disconnect overflow & water supply. Undo two screws at top inside cistern
holding it to wall.
Underneath cistern you will find 2 wing nuts - undo & remove them. Remember
where washers go.
Cistern should now lift off the pan. You will see a foam rubber donut - buy
a new one.
Under the cistern is a large plastic nut - undo that & the cistern will come
When you fit the new one, smear a leak sealer
both sides of rubber washer & top of big
plastic nut. Also around bolts that hold cistern to pan.
Place cistern back onto pan, make sure donut is evenly in place, tighten
wing nuts evenly.
When you reconnect the water, replace the fibre washer in the connector.
All should now work like new. Most likely place for leaks is where the
cistern meets the pan. If the foam donut isn't sealing use something called
Plumbers Mait (bit like putty) but 9/10 times it will be OK.
Takes me about 45 mins, but I do a lot of them.
That would be £0:11 + £4:95 p&p, total £5:06 assuming the customer is happy
to wait 24 hours without a toilet.
I've changed two diaphragms in the last 18 months which didn't solve the
problem because the plastic cistern had a small split or crack in it. Best
option for the customer is to spend £9 and know 100% that the problem is
This saves another 45 mins labour at £30 per hour removing the cistern
I presume that you mean the "Siphon had a split"?
Surely this would easily be spotted on inspection.
I think that the only flaw in your reasoning is that some people are fuelled
by programmes such as "Rogue Traders" and might question why a large item
was replaced for want of a cheap plastic diaphragm. I also wonder how
"universal" a siphon is. I can imagine a case where the ball valve might
need changing as well because the arm fouls on the siphon. Is the
replacement siphon as robust as the original?
did you see the programme where that electrician had bodged a RCD -