Loss of Flush Power in Toilet

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Since having my Heating and Hot Water system renewed/changed my Toilet is taking 2 flushes to clear. The old system was a Hot Water Boiler with Cylinder Tank. Now I have a Combi ? Can this problem be rectified or improved?
 
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No it wasn't British Gas. Lol. Just to give more info; there is one cold feed pipe going into the Bathroom. All taps on sink and bath work fine no loss of power. I have checked the Cistern and it is about 3/4 full, should this be right to the top? Engineer who done Boiler installation said sewer is problem but I disagree. The lack of power is not flushing which is creating a block, not the other way round
 
Since having my Heating and Hot Water system renewed/changed my Toilet is taking 2 flushes to clear. The old system was a Hot Water Boiler with Cylinder Tank. Now I have a Combi ? Can this problem be rectified or improved?

I'm unable to think of any circumstance where a change to your heating system might affect the ability of your toilet to flush.
 
1. If the installer did a thorough job, he / she will have changed the WC cistern's low pressure nozzle (red) for a high pressure one (white).
2. In doing so, the fill level may have been adjusted too low.
3. Simple job to adjust the float height to allow the cistern to fill to the marked level.
4. Post a picture of the inside of the cistern showing the inlet valve and float.
 
1. If the installer did a thorough job, he / she will have changed the WC cistern's low pressure nozzle (red) for a high pressure one (white).
2. In doing so, the fill level may have been adjusted too low.
3. Simple job to adjust the float height to allow the cistern to fill to the marked level.
4. Post a picture of the inside of the cistern showing the inlet valve and float.
I have not had a Toilet installed???
 
The toilet up until 4 weeks ago had a very fierce strong flush. Then, it would not flush properly taking 2 or 3 attempts and that was just a pee and piece of tissue I now believe that where its not being flushed/pulled properly its backing up. I do not believe for one minute that a blockage in the sewer pipe which is what the Engineer has suggested, is the issue. It started with an issue operating the Toilet, and is not linked / anything to do with a sewer?????
 
Here you go !
 

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Won't be related to the installation . Out of curiosity does the toilet flush on the first pump of the handle .... very common that the diaphragm on the syphon can split . Detach and then get stuck in the spreader at the back of the pan
 

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