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Error code reference

Bosch Microwave Error Code H98

Self-diagnostic failure code indicating a magnetron and/or inverter circuit problem area; no microwave oscillation detected.

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What the H98 error code actually means

The H98 code means your Bosch microwave tried to generate microwave energy but detected none, so it shut itself down for safety. This is usually a problem with the high-voltage electronics that power the heating element inside, called the magnetron. A technician will need to run specific tests to determine whether the control board, a connecting part, or the magnetron itself needs to be replaced.

Diagnostic procedure

The full H98 procedure

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1
First diagnostic step
Program DPC by pressing Clock, Timer, Start, Power Level. Then perform inverter Test1: unplug CN703 from magnetron, program High power for 1 minute, verify oven stops in ~23 seconds and input current is 0.5-1A.
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Most common causes of H98

Ranked by how often they cause this code
  1. 1Loose or failed CN703 connector
  2. 2Failed inverter board
  3. 3Defective magnetron
  4. 4DPC or control board communication fault
  5. 5Wiring harness damage between inverter and magnetron

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Questions people ask about H98

What does H98 mean on a Bosch microwave?
H98 is a self-diagnostic fault code indicating that the microwave's control system detected no oscillation from the magnetron and/or inverter circuit. In simple terms, the oven attempted to generate microwave energy and received no confirmation that it succeeded. The code prompts a structured diagnostic process starting with a DPC reprogramming sequence and an inverter output test.
Will resetting the microwave clear the H98 code?
A simple power reset will not reliably clear H98 because the code reflects an active hardware fault in the magnetron or inverter circuit, not a temporary software glitch. The DPC programming sequence (Clock, Timer, Start, Power Level) is the correct reset procedure, but if the underlying hardware problem is not resolved, the code will return as soon as the oven attempts to generate microwave power again.
How much does it cost to repair a Bosch microwave showing H98?
Repair costs vary depending on which component has failed. A wiring or connector fix is relatively inexpensive, typically in the range of $50 to $150 including labor. Inverter board replacement generally falls in the $150 to $350 range, while magnetron replacement can range from $200 to $450 or more depending on parts availability and labor rates. Obtaining a diagnostic estimate from a certified technician before authorizing repairs is advisable.
Can I fix H98 on a Bosch microwave myself?
Some initial steps, such as re-programming the DPC by pressing Clock, Timer, Start, and Power Level, can be performed without special tools. However, diagnosing and replacing the inverter board or magnetron involves exposure to potentially lethal high-voltage components. Even after unplugging the unit, capacitors inside the microwave can retain a dangerous charge. These deeper repairs are strongly recommended for qualified technicians only.
Is it safe to use my Bosch microwave while H98 is displayed?
No. When H98 is active, the microwave has detected that no oscillation is occurring, meaning it cannot heat food reliably or at all. Continuing to attempt operation with a faulty inverter or magnetron can stress other components and create additional failure points. The oven should remain unplugged until the fault is diagnosed and repaired.

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