Rule library
FatalField 8.052Subject
UAD1098 — Indicate whether the core heating system for dwelling is located below grade.
Where this rule lives in the report
Dwelling Exterior
Core Heating System Below Grade
Mechanical System Details
Report Section and Report Subsection as the GSEs define them — the black tab and grey bar you already read on the URAR.
- Severity
- Fatal — this blocks your UCDP submission and must be fixed before delivery.
- Triggered when
ImprovementType = "Dwelling" and HeatingSystemType <> "None", and CoreHeatingSystemBelowGradeIndicator is not provided in SYSTEM_DETAIL for a given instance of IMPROVEMENT- Data Point Name
CoreHeatingSystemBelowGradeIndicator- Unique ID
0300.0116- Report Field ID
8.052- What this field means
- When true, indicates that a mechanical unit that produces the heat (e.g., furnace, boiler), for an identified heating system, is located below grade.
How to fix UAD1098
UAD1098 is a Fatal UAD 3.6 edit, so clear it before the appraisal report goes to UCDP.
- 01Open the Dwelling Exterior › Mechanical System Details › Core Heating System Below Grade area of the URAR and find Core Heating System Below Grade.
- 02Check the condition that triggers UAD1098: ImprovementType = "Dwelling" and HeatingSystemType <> "None", and CoreHeatingSystemBelowGradeIndicator is not provided in SYSTEM_DETAIL for a given instance of IMPROVEMENT.
- 03Correct the missing, invalid, duplicate, or inconsistent value before submitting to UCDP.
- 04Use the official Single-family (SF1) sample value on this page as a reference pattern, then re-run validation.
This fix guidance is derived from the published rule message, trigger logic, report location, field definition, and official sample data available for this rule.
Seen in the sample reports
How this field is populated in the official UAD 3.6 sample scenarios.
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