An HVAC technician cannot find a replacement for an obsolete circuit board controlling blower off-delay, and must either replace the entire unit or find a workaround.

No direct replacement part exists; manufacturer recommends replacing the entire unit, but technician believes a generic relay could work if function mapping were available.

Severity

4High

Willingness to Pay

implied

Added

Jun 8, 2026

Workarounds Described

considers using a generic time-delay relay to bypass the board

Implied Software Gaps

Database of obsolete component replacement options with wiring guides

App Concept

PartCross HVAC Legacy Finder

An online database and community-driven platform that maps obsolete HVAC control board functions to generic replacement relays and modules. Technicians input the model and board symptoms, and the app suggests compatible generic parts with wiring diagrams, reducing costly full unit replacements.

Key Features

Database of obsolete HVAC boards with functional pinouts and replacement matches
Wiring diagram generator for generic relay installations
Community forum and verified technician solutions
Parts compatibility API for distributors

Target Users: HVAC technicians and small HVAC service companies across North America

Revenue Model: $12/mo subscription for individual technicians, $99/mo for companies with team accounts; free tier with limited lookups per month

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