If a dishwasher does not work after a faucet install, check a few typical problems.
If your dishwasher did not work after a new faucet installation, you are not alone. Often after a new installation, all the right parts and valves do not get installed or turned back on. Frequently the homeowner is the person to figure out there is a problem instead of the installation professionals.
Supply Line Valve off
The dishwasher draws water from the same pipe as the faucet, and the appliance is connected via a supply hose on the bottom of the water supply valve. However, each one has a different valve. Your installer will turn off both the faucet's valve and the dishwasher's valve when installing the faucet, for precautionary reasons. If, after they finished installing the faucet, the installers forgot to turn the valve back on, your dishwasher will not work. Simply turn the valve on, and test out the dishwasher to see if this is the problem.
Electrical Breaker off
Dishwashers require electricity to operate and, during your faucet installation, one of several things may have cut the power to your dishwasher. The installer might have turned off the breaker to the dishwasher to avoid a potential electric shock. You may notice there is no power to the dishwasher or any of the countertop appliances if this is the case. To solve this problem, just open the breaker box, and turn on the dishwasher's breaker, which should be labeled "dishwasher" on the circuit box.
Dishwasher Cord Unplugged
Another possible reason your dishwasher is not working is the plug. A dishwasher has its own plug to receive electrical power and usually it is plugged into a receptacle near the sink. Installers may unplug the dishwasher instead of turning off the breaker to prevent an electrical shock and, in many cases, they forget to plug it back in. Correcting this problem is easy; just look for the plug cord in the sink cabinet or behind the dishwasher; and plug it back in if you notice it is unplugged.
Drain and Hot Water Supply Issues
The dishwasher drains water through the same drain line as the faucet, and, during the installation, your installer likely removed this drain line to access the faucet lock nuts. However, if they did, the dishwasher would still work; it just wouldn't drain into the drain line but into your sink. The installer might have shut off the supply valve on the dishwasher itself, however. This valve is located on the side of the dishwasher and, if it is off, your unit will not receive any hot water to clean your dishes.
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