Quick diagnosis
What this code is telling you
Most likely trigger
Defective inverter power board
Recommended replacement
Microwave Inverter Power Board
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 power board first; burnt magnetron tube filament and blown high voltage diode or thermal fuse can trigger the same code and should be ruled out before replacing microwave Inverter Power Board.
Symptoms
What you may notice
- ✓Microwave runs for 3 seconds then stops completely
- ✓Food does not warm up at all
- ✓H98 flashes on display
Possible causes
Check the most likely causes first
- 1
Defective inverter power board
Start here when it matches your symptoms.
- 2
Burnt magnetron tube filament
- 3
Blown high voltage diode or thermal fuse
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
Disconnect wall power and safely discharge high voltage capacitor before servicing.
- 2
Check 2
Check magnetron filament terminals for short to ground.
- 3
Check 3
Disconnect electrical power before opening panels. Test high voltage thermal cutouts for continuity.
- 4
Check 4
Disconnect electrical power before opening panels. Replace high-voltage inverter circuit board or magnetron.
Replacement part reference
Microwave Inverter Power Board
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 H98?
Start with defective inverter power board. If that checks out, continue through the diagnostic sequence above rather than replacing a part based on the code alone.
Does H98 always mean Microwave Inverter Power Board 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 H98 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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