HVACDiagnostics & Troubleshooting4HighField Technician$ implied

An oil furnace blower won't shut off after the call for heat ends, even after replacing the control board, and troubleshooting standard components like limit switches doesn't resolve the issue.

Standard troubleshooting steps (checking limit switches, replacing control board) did not resolve the issue, suggesting a need for a more systematic diagnostic tool that can log blower behavior and identify intermittent or wiring-related faults.

Opp. Score

Severity

4High

Willingness to Pay

implied

Added

Apr 27, 2026

Workarounds Described

jumping limit switches directly at the board to rule them out
replacing the control board based on assumption before full diagnosis

Implied Software Gaps

Diagnostic software that logs blower timing and voltage to identify intermittent relay or wiring faults

App Concept

HeatTrace Diagnostic

HeatTrace Diagnostic is a mobile app and hardware sensor kit that guides HVAC technicians through step-by-step troubleshooting of complex furnace issues. It records voltage, signal timing, and component behavior to pinpoint elusive faults like stuck relays or wiring errors, reducing return visits and guesswork.

Key Features

Step-by-step guided diagnostic workflows for common furnace models
Wireless sensor probes that log voltage and signal timing to a smartphone app
Automatic fault detection based on symptom patterns
Integration with manufacturer wiring diagrams and service manuals

Target Users: HVAC field technicians at small to mid-size service companies who troubleshoot oil and gas furnaces on a daily basis.

Revenue Model: $19.99/mo per technician subscription for the app; optional hardware sensor kit $149 one-time purchase.

Existing Solutions Mentioned

new control boardjumping limit switches at board

Part of App Idea

DiagFlow HVAC

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