Ignitor Replacement on Carrier 58ZAVTTS in Burlingame

Carrier 58ZAVTTS — Ignitor Replacement (Burlingame)

Client: Mel (Burlingame) · Service: Furnace diagnosis & repair · Model: Carrier 58ZAVTTS

Issue

The unit did not initiate the heating cycle — no ignition, no startup.

Diagnostic Summary

• ✅ Power supply and safety circuits — operational
• ✅ Control signals and board response — confirmed
• ✅ Blower motor — activates normally
• ✅ Ignition stage — fails to continue (cycle aborts)

Root Cause

Inspection identified a failed ignitor. The ignitor is a wear-prone component in gas furnaces and commonly fails at the start of heating seasons when usage increases.

Recommended Work

Replace the ignitor and perform a full post-repair sequence test (startup, flame verification, safety interlocks, and a multi-cycle operational check).

Estimate

Repair cost: under $400. Note: diagnostic fee is waived when repair is performed.

Outcome

After replacement and verification the furnace completed all test cycles and returned to stable, reliable operation.

When to Schedule a Diagnostic

If your system exhibits any of the following symptoms, schedule a professional check:

• No ignition or no startup
• Repeated failed start attempts
• Sustained shutdowns during start sequence

Contact us to schedule a diagnostic and repair

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