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Thanks for chipping in The washing machine waste is marked at the top . The machine is on the floor above and travels down the 40mm pipe. Following fitting the AAVs the gurgling that was in the system has ceased so there is some benefit. Ive today received a true design 3/4" non return valve...

Hi The scenario is close buy not quite correct in that the air con is off when these smells happen. The odur is to do with the piping and removing the trap I have updated the piping to include an air admittance valve on the branch where the air con drip is located. I have reintroduced the trap...

Hi The lower connection is the dishwasher. The A/C collection tray is within the wall unit. It's not visible without removing the housing and even then you would have to take it to bits to access it but there is a hole that feeds drips it to the outlet. It is not sealed. The air con engineer...

Hi - That was done as water/air was forced upwards when the dishwasher flushed out to the grey hose above. Thss is a small amount of water that came out in a single spurt at pressure. Theres no blockage - it's been taken to bits and checked twice in the last week. It's no longer happening...

Hi MM Thanks for your message. Air con unit is higher than the hose . I have annotated in red which feed is which on the pic. The air con does not produce large volumes of water. The spurting issue has only happened when the machine is not in use. Air con is the top grey hose as annotated...

Hi I live in a 400 year old stone house and these properties, as many will know, are always a compromise when installing modern plumbing/electrics etc. I have a room in the house that has a split system air conditioning unit. The drip feed hose joins the main outlet to drain which it shares...

Hi I will check this in the morning - Are those both screws that need turning on the valves? or are we talking spanner? The plumber who installed popped in to listen. As the noise is louder in the house than at the boiler itself he is of the opinion that matter is possibly trapped in pipes...

Thank you for your posts. Oilhead - The noise was there from the off. It was only installed a week ago. Re bleeding, the screw on the front was opened. Is there any other way to bleed it? Which valves are you referring to? Agile - Im not clear what the Impeller is?

I have an outdoor Grant Combi 90 Mk2 oil fired boiler. The pump had to be replaced recently. Grant now supply Wilo, however after installation the system is now noisier when running and is omitting a 1khz tone, which is louder inside the house than at the boiler itself. This pump has a three...