The Message Said BAD LINE, but the Measurements Mattered More
Both legs were present and the range received 208 V line to line. That evidence prevented the displayed words from being treated as a complete diagnosis.
The measured evidence
- The display showed BAD LINE.
- Each supply leg measured approximately 120 V.
- The two legs measured 208 V together.
- The diagnostic discussion considered that line-to-line value acceptable for the installation.
The same symptom can have a different cause. A BAD LINE message must be interpreted against the model data and the building service; the words on the display do not replace measurements.
The GE Monogram range that displayed BAD LINE despite an acceptable 208-volt line-to-line supply.
Why the power board became the next branch
The original concern was that the range could see only one side of its supply. Finding both legs and 208 V line to line made a missing-leg explanation less consistent with the evidence. The discussion then identified the power board as the next likely fault path.
That closes the first branch without declaring the board failed: qualified service should confirm the model's supply specification and the board inputs, then verify normal heating after the fault is corrected. A breaker reset is not evidence of a durable repair.
What to preserve for the service call
- Photograph the exact BAD LINE display.
- Provide the complete model and serial number.
- Note whether the error appears immediately or only during heating.
- Report whether the property normally uses 208 V or 240 V service.
High-voltage safety: line-to-line range measurements can expose lethal voltage. The readings in this case are evidence, not homeowner instructions; supply and board testing require qualified service.