LED flashes code 33; blower runs continuously, burners do not fire.

Warning: Flame rollout and repeated limit trips can indicate a cracked heat exchanger or serious combustion problem. Turn off gas and power and contact a qualified technician if you see signs of overheating or flame outside the burner area.

• Step 1 – Inspect rollout switches: Locate rollout switches around the burner compartment. Some have manual reset buttons; press gently to reset. If a switch trips again, do not continue resetting—find the root cause.
• Step 2 – Check for obstructions: Inspect the burner area and heat exchanger inlets for debris, rust flakes, or soot buildup. Do not attempt deep cleaning of the heat exchanger yourself; this should be done by a professional.
• Step 3 – Verify venting: Ensure the flue or PVC vent is not blocked and that the inducer is operating correctly.
• Step 4 – Test switches: With power off, test each rollout and limit switch for continuity. Replace any that remain open at room temperature with Tempstar-approved parts.
• Step 5 – Professional inspection: If rollout switches trip repeatedly or you see scorch marks, warped metal, or unusual odors, have a licensed HVAC technician inspect the heat exchanger and combustion system before further use.