the pipe connecting the two bays has a negative pitch, you need to shorten the down stem on the side that gets the backup if it is the side furthest from the drain, or get a longer stem if it is the side closest to the stem, if it is a t connection where the drain is in the middle just shorten the stem on the side that gets the backup
see a plumber
There may be no hot water coming out of the kitchen sink due to a problem with the water heater, a blockage in the hot water pipe, or a malfunctioning faucet. It is important to check these potential issues to determine the cause of the problem.
The kitchen is probably closest to the water heater and the shower is the farthest. Water cools down the farther it travels through the pipes.
If it's coming from the roof then the bathroom ceiling will have a water stain on it too. If you don't see this then it is coming from your bathroom.
The purpose of a kitchen sink trap is to prevent sewer gases from entering the house and to catch debris that could clog the plumbing system. It functions by creating a water seal that blocks the gases from coming up the drain while allowing water and waste to flow through.
Water coming back up your kitchen sink could be due to a clog in the drain pipe, a blockage in the plumbing system, or a malfunction in the drainage system. It is important to address this issue promptly to prevent further damage and ensure proper drainage.
That is probably the sound of water draining through a clog.
Call your water company to see if there is an outage or for whatever reason they may have shut it off.
water thats in the kitchen
To improve water temperature in your kitchen, consider installing an under sink hot water booster. This device can increase the temperature of the water coming from your faucet, providing you with hotter water for various tasks such as washing dishes or hands.
Water may not be coming through the portafilter due to a clog or blockage in the filter basket, a faulty seal, or a problem with the espresso machine's pump.
There may be a blockage in the pipes specifically connected to the kitchen sink, preventing water from flowing through. This can be caused by debris or a clog in the pipes.