Posts
All the articles I've posted.
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Carrier 13 Error Code — Limit Switch Lockout Fix
Carrier error code 13 means the limit switch tripped due to overheating. This guide covers every cause and fix — from clogged filters to cracked heat exchangers.
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Carrier 21 Error Code — Gas Heating Lockout Fix
Carrier error code 21 signals a gas heating lockout — the furnace failed to ignite after multiple attempts. Learn the exact steps to diagnose and reset it.
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Carrier 34 Error Code — Ignition Proving Failure Fix
Carrier error code 34 means ignition proving failure — the furnace tried to light but couldn't confirm a flame. Here's how to diagnose and fix it fast.