Quick diagnosis
What this code is telling you
Most likely trigger
Defective inverter PCB module
Recommended replacement
Inverter Power Module
Diagnostic path
4 ordered checks
Part fit
Exact model number required
Safety first
Before opening the appliance
Unplug the appliance before removing panels or testing internal components. Do not bypass safety switches or live-test high-voltage, gas, refrigerant, or combustion components unless you are qualified to do so.
Read the full safety disclaimerRoot cause
Why the control reported this error
The microwave control displays this fault after detecting an abnormal sensor, keypad, door, inverter, or heating condition. Check defective inverter PCB module first; loose high-voltage harness lead and short circuit in magnetron can trigger the same code and should be ruled out before replacing inverter Power Module.
Symptoms
What you may notice
- ✓Unit powers off 2 seconds after START
- ✓Humming noise followed by shutdown
- ✓H97 error displayed
Possible causes
Check the most likely causes first
- 1
Defective inverter PCB module
Start here when it matches your symptoms.
- 2
Loose high-voltage harness lead
- 3
Short circuit in magnetron
Diagnostic sequence
Work through these checks in order
Stop when you find the fault. Do not perform a step that requires skills or live testing you are not qualified to do.
- 1
Check 1
Unplug microwave unit from outlet.
- 2
Check 2
Disconnect electrical power before opening panels. Verify wire leads connecting main PCB to inverter board are secure.
- 3
Check 3
Disconnect electrical power before opening panels. Test magnetron terminal resistance.
- 4
Check 4
Disconnect electrical power before opening panels. Replace high voltage inverter board module.
Replacement part reference
Inverter Power Module
Exact OEM part number
Model number required
Fitment note
The exact OEM part number varies by model and production revision. Verify the complete model number before ordering.
Verify the appliance model before ordering.
Manufacturers can use different parts under the same error code across model families and production revisions.
Where do I find my model number? →FixCodeDB may earn a commission from qualifying purchases made through affiliate links.
Common questions
Quick answers for this fault
What should I check first for H97?
Start with defective inverter pcb module. If that checks out, continue through the diagnostic sequence above rather than replacing a part based on the code alone.
Does H97 always mean Inverter Power Module is bad?
No. An error code identifies the condition the control detected, not a guaranteed failed part. Confirm the likely causes and wiring first. The exact OEM part number varies by model and production revision. Verify the complete model number before ordering.
When should I stop troubleshooting H97 myself?
Stop if the next step requires live electrical testing, sealed-system work, gas or combustion service, or any procedure outside your training. Unplug the appliance before removing panels or testing internal components. Do not bypass safety switches or live-test high-voltage, gas, refrigerant, or combustion components unless you are qualified to do so.
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