Is your dishwasher not cleaning your dishes as you would expect? This can be due to many different factors one of which could be a faulty pump motor. Doing a quick diagnostic check on a pump motor with a multimeter will help you diagnose the issue. Before considering testing a pump motor, run a diagnostic check on the dishwasher to see if it provides you with any error codes.
Most modern dishwashers will show an error code that you can then reference with the user manual to find the fault. If the error code shows a pump motor issue then you will need to test it to confirm the diagnosis. If the dishwasher has not provided any error codes, you can test the pump motor to remove it from your enquiries.
A fully operational dishwasher pump motor will have a resistance levels of 20 – 40 Ohms when tested with a multimeter.
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Step by Step Guide To Test Dishwasher Pump Motor
Follow these simple step’s in order to help you test a pump motor.
Step 1
Disconnect the power source to the dishwasher by unplugging it at the power outlet. Do not work on a dishwasher whilst it is still connected to the power. Once the dishwasher is now disconnected you are safe to move onto step 2.
Step 2
Locate the dishwasher pump motor. On most dishwasher models it will be located behind the kickplate at the bottom of the dishwasher. To remove the kickplate you will need to remove all screws and keep them safe ready to put back in place.
Step 3
Remove both wires that are connected to the motor. Get your multimeter setup correctly by placing it to R X 1 (resistance testing) settings. Now place both probes, one on each terminal to test the resistance levels of the pump motor. A motor in good working order will show a resistance level of 20 – 40 Ohms.
Step 4
Check the pump motor ground connection. Place one probe on one of the motor terminals and the other probe on the bare metal casing of the motor. This test result should also show a 0, make sure to test both terminals one at a time.
If the motor fails any of these above tests then it will need to be replaced by a new or a refurbished motor.
This video will show a visual demonstration on how to test a dishwasher pump motor:
How Much Does a Replacement Dishwasher Pump Motor Cost?
This will vary depending on the brand and model of a dishwasher you have got. On average the cost of a replacement part will be $70 – $150 (£50 – £110) with the labor charge for replacing the motor around $70 – $135 (£50 – £100).
How Do I Know If My Dishwasher Pump Is Bad?
First check there are no blockages blocking any water from circulating and draining from the dishwasher. If there are no blockages, turn the dishwasher on to a cycle and listen out for the drain pump underneath the kickplate. If it runs and the water does not circulate or drain then it’s very likely that the pump is bad.
Another way is to test the motor with a multimeter to check the resistance levels of the pump motor. Follow the above steps to fully test the pump motor.
Dishwasher Circulation Pump Noise
The main cause for the circulating pump to become noisy is worn bearings. They become worn after time and a lot of use, this will cause a continuous whining or loud buzzing noise from the dishwasher. In most cases you can get replacement bearings to solve the problem.
Ensure you get the motor tested at the same time to check for any problems that can arise in the future. It might be worth replacing the whole motor to save costs further down the line.
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