Dacor Microwave F1 Error: Control board fault
This dacor microwave f1 error code guide explains what this fault means for your Dacor appliance and how to respond safely. What F1 Means on a Dacor Microwave The F1 error code indicates a control board fault on Dacor microwave models including the DMW2420 drawer and DMR30 over-the-range units. The main electronic board has failed […]
~20%
DIY Fixable
From $200
Typical Repair Cost
30-60 min
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. A magnetron or high-voltage fault makes the microwave unsafe. Do not use until repaired.
Can I reset the code?
Yes. A 2-minute unplug reset may clear F1. Persistent faults require professional service.
When to stop immediately?
Stop if you notice: F1 returns immediately after power reset, Microwave emits burning smell or sparks during power-on.
Symptoms You May Notice
Microwave does not heat food
The turntable spins and the interior light comes on, but food remains cold after a full cycle. The magnetron is not receiving power due to the control board fault.
Display freezes or shows random characters
The DMW2420 or DCM24 display locks up showing garbled digits or segments that do not correspond to any normal readout, and buttons have no effect.
Unit powers on but immediately shows F1
The microwave displays F1 within seconds of being plugged in or after a door open-close cycle, before any cooking function is selected.
Intermittent shutdowns during cooking
The microwave cuts out 10 to 30 seconds into a cook cycle, displays F1 briefly, then may return to the clock screen. The fault becomes more frequent over time.
Possible Causes
Failed main control board
The microprocessor or supporting circuitry on the main PCB has failed. On Dacor DMW2420 models, this is typically caused by power supply capacitor aging or solder joint cracking.
Requires ProfessionalPower surge damage to control electronics
A voltage spike from the home electrical system has damaged the control board firmware or blown a protective component, preventing the self-check from completing.
Requires ProfessionalSafe Checks You Can Do
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1
Reset by unplugging the unit
Unplug the microwave from its outlet (or turn off the dedicated breaker for built-in DCM24 models) for 5 minutes, then restore power.
If F1 does not return after the reset, the fault was a transient glitch. Monitor for recurrence over the next few days.
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2
Verify outlet voltage
Use a multimeter to check that the outlet providing power to the microwave delivers a steady 120V AC. Voltage below 110V or above 130V can cause control board instability.
Built-in Dacor microwaves like the DCM24 should be on a dedicated 20-amp circuit, not shared with other kitchen appliances.
Tools required
When to Call a Professional
Contact a qualified technician if:
- Code persists after two power-cycle attempts
- Visible burn marks or component damage on control board
- Technician required to replace control board assembly
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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