Monogram Dishwasher C6 Error: Water temperature too hot
The C6 error code indicates that the water temperature inside the dishwasher tub has exceeded the safe maximum threshold. The temperature sensor is reporting a reading above what the control board considers safe for normal operation, prompting an automatic shutdown to protect the dishwasher and its contents.
~30%
DIY Fixable
From $150
Typical Repair Cost
1–2 hrs
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Maybe. Standard wash cycles at normal temperature settings may be used cautiously while investigating the cause. Avoid sanitize or high-temp cycles until the fault is resolved.
Can I reset the code?
Yes. A power reset will clear the code. If the cause is high incoming water temperature, lowering the water heater setting and resetting may permanently resolve the fault.
When to stop immediately?
Stop if you notice: Stop and cut power immediately if the heating element appears to be running continuously throughout the entire cycle, as this represents a control board relay failure that is a fire risk., Stop using high-temp or sanitize cycles until a technician confirms the thermistor and heating relay are functioning correctly..
Symptoms You May Notice
Excessive steam or very hot interior when door is opened
Opening the door mid-cycle or immediately after a fault releases a large cloud of very hot steam, and the interior surfaces are noticeably hotter than usual to the touch.
C6 displayed on the control panel
The fault code appears typically during the wash or heated rinse phase, when the heating element is active and water temperature is at its peak.
Plastic items warped or discolored
Lightweight plastic containers or utensils in the dishwasher may show warping, softening, or white heat marks, confirming unusually high temperatures during the cycle.
Cycle stops during the heated rinse or sanitize phase
The dishwasher interrupts the cycle specifically when the heating element is active, as that is when the overtemperature condition typically develops.
Possible Causes
Incoming hot water temperature too high
If the home water heater is set above 140°F (60°C), the already-hot water combined with the dishwasher's own heating element can push the internal temperature above the safe threshold.
DIY PossibleStuck or shorted heating element relay
The control board uses a relay to switch the heating element on and off. If this relay welds itself closed (sticks on), the element heats continuously without being commanded to stop, causing rapid overtemperature.
Requires ProfessionalFaulty thermistor providing incorrect low reading
A thermistor reading lower than actual temperature can fool the board into over-activating the heating element, as the board believes the water still needs to be heated when it is already at or above maximum.
Requires ProfessionalSafe Checks You Can Do
-
1
Check and lower the water heater temperature
Locate your home water heater thermostat and verify it is set to 120°F (49°C) — the recommended setting for dishwasher use. Settings above 140°F can push dishwasher inlet water above the safe range.
Run the hot water tap at the kitchen sink for two minutes before starting the dishwasher to flush the supply line and deliver water at the set temperature.
-
2
Reset and run a normal wash cycle without sanitize
Cut power at the circuit breaker for 60 seconds, restore power, then select a standard wash cycle without the sanitize or high-temp wash option. Monitor whether C6 returns.
If C6 only occurs on sanitize or high-temp settings, the fault is likely temperature-related to the sanitize heating sequence rather than a stuck relay.
-
3
Verify the heating element is not continuously on
Start a cycle and listen and feel for continuous heat generation even during the non-heated wash phase (early in the cycle). Unusual warmth on the door or excessive steam early in the cycle suggests the element is running continuously.
If you suspect continuous heating, cut power immediately and call for service — a stuck relay is a safety concern.
When to Call a Professional
Contact a qualified technician if:
- The water heater is already set at or below 120°F but C6 still occurs, indicating an internal heating control fault.
- The heating element is detectably hot during phases of the cycle when it should be off, confirming a stuck relay on the control board.
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
Dishwasher Repair Service Schedule Appointment