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If your megaflo was installed properly your incoming mains will pass through the pressure reducing valve then tee off to supply the cold taps and through the cylinder to feed your hot taps. This way there is equal pressures at all of the outlets. There is probably an issue with the pressure...

I charge £80 + vat. Not including parking or other expenses incurred.

It would be to fit a heat only boiler and fully pump the system. When they say gravity is not allowed it is referring to the way your cylinder is heated not the way your system is filled.

Are you sure it's been fine since they replaced the thermostat till now? It sounds like it's permanently switched live and just heating up the bypass circuit.

The top dome part will unscrew and there should be a screw underneath that holds the other part of the tap onto the cartridge.

The downstairs radiators must be on a separate drop. In other words the pipes must go upstairs from the boiler and then drop down somewhere else to feed the downstairs radiator circuit. Obviously the water won't go back up and come down to the drain off point by the boiler. Are there any drain...

Are you wanting to run the whole house from the pump or just a shower? Where is the highest outlet you want to pump in relation to the cold water storage tank in the loft? Whichever pump you use will be quite noisy but if you only pump the shower/bath then at least it will only be noisy...

If there is a link between SL and LR then the room stat has been disconnected. I would be checking the diverter valve but you should be calling someone in for that unfortunately.

If you pull the front of the boiler down as you did in the video so you can see the electrical connections. Here you can see where your power cable comes in and connects to the boiler. Right next to where the power cable connects you'll see terminals 3 and 4. Is there a connection between 3 and...

Unfortunately Tony's right. The only tests that need to be done now require the use of a multi-meter to properly test where the fault lies.

You've definitely not got a room thermostat have you? Is the heating dial on the front of the boiler turned up to full? If you turn the boiler on with the timeclock disconnected does is still say S30 when you press i? Also when you rotate the heating temperature dial on the boiler does the...

You're not alone Tony. I also do a hot chemical flush to remove flux residue.

The timeclock will just pop off and pull away from the front of the boiler. You need to leave the radiator temperature turned up as well. Just put a flat head screwdriver under the edge if it while it's turned off and pop it off.

In that case I suspect you have a faulty timeclock. If you definitely don't have a room thermostat you can easily test to see if the timeclock is working. Turn power off at the boilers plug or fused spur. Then you need to disconnect the timer. It will just pop off and pull out. Now turn the...

What I said still applies. Have you turned the heating on at the timer and checked the status? Is it the built in mechanical timer you have? If so they usually have a green light that indicates the heating is on. Does the boiler do anything when you turn the heating on?

I would also be inclined to check the pressure reducing valve on the feed to the thermal store. They can drastically reduce the flow when faulty.

Try switching your heating on at both the timer and room thermostat and then press the 'i' button on the boiler display. This will come up with a status code. Let us know what it says. If it remains on S30 then the boiler is waiting for a demand and the problem lies with the external controls.

You could put some automatic bleed vents on the nearest radiators and an automatic air vent on the pipework near the boiler. Have you tried running the boiler at a lower temperature?

It's hard to diagnose without looking at the boiler but if the pilot is lighting but then not lighting the burner fully I would expect it is either not sensing the pilot is lit or there is a problem with the gas valve not fully opening. If you are worried about being ripped off surely you must...

You need to open the TRVs more. At the mid point they will be shutting off their radiators when the room reaches about 18C yet the boiler will continue trying to satisfy the room thermostat yet with the hallway radiator shut off, which is the reason you don't have a TRV by the thermostat, it...