Limit circuit lockout. The limit or flame rollout switch was open longer than 3 minutes, or 10 successive limit trips occurred during high heat. The control auto-resets after 3 hours. The manual says to see status code 33.
Bryant 926TB code 13 is the limit-circuit lockout. Count 1 short flash and 3 long flashes. The troubleshooting guide says the limit or the flame rollout switch was open longer than 3 minutes, or high heat had 10 limit trips in a row. The control auto-resets after 3 hours and says to see code 33 for the fault itself. This page does not invent a code 33 cause list. If rollout opened, leave the furnace off.
Likely causes
- Limit switch open longer than 3 minutes
- Flame rollout switch open longer than 3 minutes
- 10 successive limit trips during high heat
Safe checks for 13
- Count 1 short flash and 3 long flashes before you cut power. The 3-hour auto-reset is not a repair
- If a rollout switch has opened, leave the furnace off. Do not reset it and walk away
- Technicianuse status code 33, which this lockout points to, to find which switch opened
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician if 13 is stored. This Bryant page only states what code 13 itself says. It does not copy another brand's cause list onto code 33.
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Parts & tools for this fix
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High limit and rollout switches: guide
In this code: Limit switch open longer than 3 minutes
A safety device: we explain it but do not link to buy one.