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Is some X800 the safest option that will still effectively clear any magnetite?

Nearly £80, new one locally is over £100

Is the new whistling sound something a dodgy diverter or plate heat exchanger would cause?

Had a gas engineer round before and they said it was the plate heat exchanger. The eBay diverter's pin is definitely not reaching high enough so I'm happy to give a diverter from a local trustworthy supplier a try, but otherwise getting another professional in sounds sensible

It cuts out around 50C-60C (as hot as it can get in 30 seconds). Diverter was from a place on eBay who are happy to take it back when I explained the issue, so have ordered one from a reputable place nearby to collect and will see if that helps.

Something further. After having replaced all of the above parts, there's now no hot water at all. If the hot water tap is running, the heating also won't activate and pin at the top of the diverter isn't pushing the microswitch all the way. I can get in there and push it fully and then the...

It flashes but only for a few seconds

Pump is running and sounds fine. Getting a warning light on fan for about two seconds after boiler shuts off, and then the light disappears as the boiler fires up again.

The central heating runs for c. 30 seconds, then cuts out for 20 seconds, then runs for another 30 seconds. Rinse and repeat. Same for hot water. Solutions I have tried so far: - Replaced diverter with new Baxi replacement as old one was in a bad way and radiators were warming when running a...

Weirdly I came to the boiler and it worked without needing to do anything. However frustratingly the cutting-off issue is still happening.

I haven't, will try that thank you. But removing the big screw on the pump means a lot of water comes out and the PCB would be in the water's path so I'm being extremely cautious and isolating and draining boiler first before removing the screw so it's only a trickle that my towel can handle...

Have replaced the original plate heat exchanger on my Baxi 105e following issues with boiler cutting out, and rather than throwing it away was wondering if it can be used again by someone else if sufficiently cleaned? I ran it under a tap and some black bits came out, but not too much. Does it...

As per the title - have had persistent issue with hot water running hot for about 20 seconds, then running cold, then running hot again. Central heating has also been doing the same. Radiators would also heat up when running the hot water. I have drained the system and replaced plate heat...

Thanks both - the new seals did stick out a little, and so sorted it. Didn't have any silicone grease but will pick some up the next time I'm in Screwfix

It's why it's not making a tight seal that I'm struggling with. The screws are in as before, the seals are in the hydraulic inlet as before. The seals don't stick out of the hydraulic inlet, so the heat exchanger is just sitting flat against it. I will try and see if the new seals stick out a...

As per title, have replaced the plate to plate heat exchanger on a Baxi 105e. After fitting the replacement and putting everything back, upon restoring the domestic water supply there is a leak out the right-hand-side of the heat exchanger. The heat exchanger was purchased from eBay with has...

Baxi 105e is showing the dreaded cutting out issue. When running either hot water or central heating, the boiler heats the water, the burner then stops prematurely and the water runs cold for about 10 seconds, then the burner comes back on and the water warms again. Rinse and repeat every...

I already had the O-rings ordered and they seem to have sorted it, but if in the same boat again I will try this. EDIT: a second O-ring is showing a very small leak so will try this technique to sort this :)

Thank you I will try this :)

SGS43T82GB/36