This is about the faucet on my IP485, but I think the same faucet is commonly used.
I suffered from poor flow for sometime.
I eventually removed the box beneath the sink in the engine room to reveal the plumbing. Removing the box was straight forward - just lots of screws. The whole box can be removed from the engine room.
I expected to find a diverter valve beneath, between the faucet and the sprayer. There was none. The plumbing is very simple. There is one pipe to the cold water pump. The faucet has three small bore metal pipes that screw into its base. These pipes are in turn connected to the plastic hoses supplying hot and cold, and direct to the sprayer.
I can well imagine that because the pipes are of the typical small bore copper commonly used these could become restricted where the wide bore plastic connects to the small bore pipes. I had no such restriction.
I expected to find my problem beneath the box, but no such luck.
In desperation I removed the tap cartridges, (which I had done before) and these were also fine.
Finally I rmoved the swan pipe from the middle of the faucet and noticed there is a small what appears to be sprung loaded valve in the middle of the pipe of the tap itself, not the swan pipe. It is easy to see if you look directly down into the centre tube which the swan pipe screws onto. In my case the sprung valve barely lifted. Lots of jiggling with a screw driver and thin nosed plyers worked the valve free and full flow was instantly and impressivley restored. Through time I guess the valve had just silted up probably with a bit of lime scale as well.
I finished off the job with some descaler poored in the pipe and left to sit, but it barely fizzed and didnt have any obvious effect other than to bring the valve back to a shiny colour.
Problem solved.
