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There may be a problem with the Humidity Thermistor or the associated wiring.
Power unit down by turning off the circuit breaker(s) for one (1) minute.
Power unit up by turning on the circuit breaker(s).
Monitor the oven for one (1) minute to ensure the error code does not display again.
Verify oven operation.
Call 1-866-616-2664 or click below to schedule an appointment.
Parts That May Need Replacement
High-voltage capacitor discharge tool ($90), magnetron tester ($200), microwave leakage detector ($150). Our technician arrives with $3,000+ in professional tools — your diagnostic is free.
Licensed & Insured · 90-Day Warranty · Same-Day Service
Here's what a professional technician does to resolve this issue:
Power unit down by turning off the circuit breaker(s) for one (1) minute.
This repair requires high-voltage discharge tools, magnetron testers, and microwave leakage detectors. Most homeowners find it safer and more cost-effective to have a licensed technician handle it.
Microwave capacitors store lethal voltage (4,000V+) even when unplugged. This is the single most dangerous DIY appliance repair. Our techs are licensed and insured — let them handle the risk.
Licensed & Insured · 90-Day Warranty · Same-Day Service
Don't let error code F3H disrupt your day. A professional diagnosis takes about 30 minutes — and it's free when you proceed with the repair.
Licensed & Insured · 90-Day Warranty · Same-Day Appointments Available
Fixed or It's Free
Free Service Call & Diagnosis — no hidden fees, offer ends Sep 15
Amana error code F3H indicates: There may be a problem with the Humidity Thermistor or the associated wiring.. This is a medium-severity issue affecting your microwave.
Power unit down by turning off the circuit breaker(s) for one (1) minute. Then, Power unit up by turning on the circuit breaker(s). Then, Monitor the oven for one (1) minute to ensure the error code does not display again. There are 2 more steps — see the full troubleshooting guide above. If these steps don't resolve the error, contact a professional.
Repair costs for Amana F3H typically range from $100 to $500 depending on the specific cause. EasyBear offers free diagnosis when you proceed with the repair. Call (415) 795-7300 for a same-day appointment.