Panasonic Microwave H98 — What It Means & How to Fix It
H98 means the magnetron isn't producing microwave output — the oven detected 'no oscillation' after you pressed Start.
What this code means
H98 is a magnetron no-oscillation error: the inverter is being told to run but the magnetron isn't generating microwaves, so the oven shuts the cycle down.
The code appears after pressing Start, the food doesn't heat, and the oven may hum or click without cooking. That's the signature of a magnetron that isn't firing.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Primary magnetron failed or lost output | Common | no |
| Inverter failure starving the magnetron | Common | no |
| High-voltage wiring or component fault | Less common | no |
What you can try yourself
- Unplug for 30 seconds, then plug back in and try one short cook cycle.
- If H98 returns immediately, stop retrying and call a service center.
- Keep the cabinet closed — the magnetron and inverter sit beside a capacitor that retains charge after unplugging.
- Mention the code when booking; many techs arrive knowing to test the magnetron and inverter pair.
When to call a technician
- H98 reappears after the 30-second reset
- Food stays cold while the oven hums or clicks
Typical professional repair cost: $100–$300 typical for a service visit replacing the magnetron and/or inverter; check magnetron warranty coverage first.
Frequently asked questions
Could a bad outlet cause H98?
An outlet problem usually shows as the oven not powering on at all. H98 is the oven reporting that the magnetron didn't oscillate, which points inside the unit.
Is the magnetron worth replacing, or should I buy a new oven?
That depends on the oven's age and the repair quote. If the magnetron is under the longer Panasonic warranty, the repair can be far cheaper than a replacement.
Sources checked
Error meanings can vary by model. This guide was checked against the documentation above; use the manual for the model number on your own appliance when it differs.
Related Panasonic codes
- Panasonic Microwave H97 H97 points at the magnetron and high-voltage circuit — the oven tried to start cooking and detected a fault in the inverter input.
- Panasonic Microwave U14 U14 is a user-level code that means the water tank is empty or not seated properly on a combi steam model — often a no-cost fix.
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