- Appliances
- Microwave ovens
H98
Panasonic H98 or H97 on a microwave: power supply failure
Risk level
High
Professional inspection is recommended.
Urgency
Medium
Quick answer
On a Panasonic microwave, H98 or H97 appears when the oven stops cooking because its internal power supply failed. If it is the first time, switch the power off and back on; if the code persists, stop using it and call service.
Safety first
Stop and check this first
- Panasonic forbids removing the outer panel: repairs must be done only by qualified service personnel. Inside there is high voltage that can stay charged even when unplugged.
- Do not use the microwave if the door is bent, the hinges or latches are broken or loose, or the seals are damaged: Panasonic's manual forbids it because of microwave exposure risk.
Safe checks you can perform
- Code and circumstances
- Power off and on, first time only
- One short test with a load
Leave these tasks to a qualified professional
- Do not attempt this professional task: Power board and magnetron diagnosis
- Do not attempt this professional task: Door, seals and safety latch check
- Do not attempt this professional task: Final heating test
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Power board and magnetron diagnosis
What they doPanasonic's authorised service checks the internal power supply and the magnetron with the service manual procedure, including discharging high voltage before touching anything.
They must show youthe test or measurement that rules one part out and confirms the other.
In writingwhich part failed, its part number and the reason for replacing it.
Door, seals and safety latch check
What they doBefore returning the unit, the technician checks that the door closes properly and that hinges, latches and seals are not damaged, as Panasonic's manual requires for using the oven.
They must show youthe door closing properly and the condition of seals and latches.
In writingthe condition of the door and latches after the repair.
Final heating test
What they doAfter the repair, the technician heats a load of water and checks that the oven finishes the cycle with no code.
They must show youthe heated water and a full cycle without H98 or H97.
In writingthe test done, the result and the date.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Code and circumstances
- Who:
- you, no tools.
- How:
- note whether it shows H98, H97 or H00, whether the oven stopped mid-cook and whether there was a storm, outage or tripped breaker before it.
- Result that matters:
- the exact code and whether it coincided with a supply problem.
- If it coincided with an outage or storm:
- the surge Panasonic mentions is more likely.
- If it appeared in normal use with nothing unusual:
- note it; it carries more weight for the technician.
- Evidence to keep:
- photo of the display and a note of the date and what happened.
Evidence: H97 or H98 error displayed on microwave · Panasonic owner's manual, microwave oven NN-SN686S and NN-SN67HS
Power off and on, first time only
- Who:
- you, at the plug or breaker.
- How:
- remove power from the microwave by unplugging it or switching off its breaker, then restore it, as Panasonic says for the first time it appears.
- Result that matters:
- whether the code clears and the oven starts normally.
- If it clears:
- run a single short test with a load.
- If it stays or returns:
- do not keep resetting; stop using it and call service.
- Evidence to keep:
- note of the reset and the result.
Evidence: H97 or H98 error displayed on microwave
One short test with a load
- Who:
- you, with a microwave-safe container of water.
- How:
- place a microwave-safe container of water inside and set a short time, staying in front of it. Panasonic forbids running it empty.
- Result that matters:
- whether it heats the water and finishes without a code.
- If it heats and the code stays away:
- it was a one-off; if it repeats, call service.
- If the code returns or it does not heat:
- stop using it and ask for authorised service.
- Evidence to keep:
- note of whether the water heated and when the code appeared.
Evidence: H97 or H98 error displayed on microwave · Panasonic owner's manual, microwave oven NN-SN686S and NN-SN67HS
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Appliances
- Brand
- Panasonic
- Product type
- Microwave ovens
Known code variants
- H00
- H97
- H 98
- microondas Panasonic H97
- Panasonic inverter H98
- Panasonic microondas H98
- Panasonic microwave H97
- Panasonic microwave H98
What it means
Panasonic's manual says that if the oven stops cooking and shows H00, H97 or H98, its power supply has failed and you should contact an authorised service centre. Panasonic Australia adds that it is sometimes the result of a power surge and that otherwise the power PCB or the magnetron, the part that generates the microwaves, may have failed. The first time, it can be cleared by switching the power off and on. The code does not say which part has failed.
Warnings and stop conditions
- Higheditorial warning
Panasonic forbids removing the outer panel: repairs must be done only by qualified service personnel. Inside there is high voltage that can stay charged even when unplugged.
Evidence: Panasonic owner's manual, microwave oven NN-SN686S and NN-SN67HS
- Highsource verified
Do not use the microwave if the door is bent, the hinges or latches are broken or loose, or the seals are damaged: Panasonic's manual forbids it because of microwave exposure risk.
Evidence: Panasonic owner's manual, microwave oven NN-SN686S and NN-SN67HS
Symptoms and causes
Probable causes · in order
- Power surge on the supplyPossible
Panasonic Australia says the code is sometimes the result of a power surge. It fits if it appeared after a storm or outage and clears when power is switched off and on.
Evidence: H97 or H98 error displayed on microwave
- Failed power boardPossible
Panasonic names it as a possible failure. It is suspected if the code returns after the reset; only service can confirm it with the unit open.
Evidence: H97 or H98 error displayed on microwave · Panasonic owner's manual, microwave oven NN-SN686S and NN-SN67HS
- Failed magnetronPossible
The other part Panasonic mentions. The code does not tell it apart from the power board; a service diagnosis is needed.
Evidence: H97 or H98 error displayed on microwave
Virtual technician
Does H98 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
H97 or H98 error displayed on microwave
Panasonic · 2025 · official_doc
- 2
Panasonic owner's manual, microwave oven NN-SN686S and NN-SN67HS
Panasonic · 2016 · manual
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