Monogram ZBD9900 Dishwasher Code AUTO + HEAVY Lights Flashing: water will not drain
When the AUTO and HEAVY lights flash together on a Monogram ZBD9900 top-control dishwasher, such as the ZBD9900RII, the control is reporting a drain problem. The water was not pumped out after 120 seconds, and the…
- Code
- AUTO + HEAVY Lights Flashing
- Appliance
- Dishwasher
- Brand
- Monogram
- Warranty
- 30-day workmanship
What AUTO + HEAVY Lights Flashing means
When the AUTO and HEAVY lights flash together on a Monogram ZBD9900 top-control dishwasher, such as the ZBD9900RII, the control is reporting a drain problem. The water was not pumped out after 120 seconds, and the program stopped. The owner sees both lights flashing and water left standing in the tub. The filter may simply need cleaning. We confirm this meaning for the ZBD9900 series only.
Common causes of AUTO + HEAVY Lights Flashing
- Clogged filter or sump
- Drain pump not moving water
- Blocked or kinked drain hose
- Drain connection at the sink or disposer
- Control output to the drain pump
1. Open the door carefully and check how much water is standing in the tub. 2. Remove and clean the filter at the bottom of the tub. 3. Look for food or glass in the sump area. 4. Check that the drain hose under the sink has no kink. 5. Run a short cycle and call us if the lights flash again.
- A clean filter does not rule out a weak pump or a blocked hose
- We test the drain pump and check the hose and the air gap
- If a disposer is connected we check its knockout plug
Other Dishwasher codes
Why are two lights flashing?
The pair of lights is how this series shows the drain message. A single light means something else, so the combination tells us exactly where to look.
Can I bail out the water myself?
You can scoop out standing water with a cup if you need to, then clean the filter. Do not tip or move the unit, and keep it unplugged if water spilled.
Will a clean filter fix it?
Often it does, since debris slows the drain. If the water stays after cleaning, the pump or the drain hose is the next place we check.
Still seeing AUTO + HEAVY Lights Flashing?
A technician diagnoses it on site and gives you the price in writing before any work starts.