Oster coffee maker turns on and makes clicking sounds, but no water flows and no coffee is brewed.

Safety first: Unplug and allow the unit to cool before descaling or opening.

Descale aggressively:

• Fill the reservoir with a 1:1 mixture of white vinegar and water.
• Start a brew cycle and listen for boiling or gurgling. If little or no water flows, stop the cycle after a minute.
• Let the unit sit for 30–45 minutes to allow the vinegar to dissolve internal scale.
• Restart the brew cycle and see if flow improves. Repeat if necessary.

Check reservoir and inlet:

• Remove the reservoir and inspect the outlet for debris. Rinse thoroughly.
• Inspect the inlet screen or grommet on the coffee maker body and clean any buildup.

Internal inspection (advanced):

• Remove the bottom cover to access the aluminum heating tube and silicone hoses.
• Check hoses for kinks or blockages and the one-way valve for proper operation.
• If the heating element does not warm at all, test it for continuity; replace if open.