Suburban furnace airflow, overheating, soot, or closed register

Use this when Suburban furnace guidance points to restricted registers, return air, blocked venting, soot, erratic cycling, or delayed ignition.

Owner-safe checklist

• Keep heat registers open and do not close a register to move heat elsewhere.
• Remove only visible return-air restrictions and loose items near the furnace compartment.
• Check only visible exterior vent openings for blockage; do not install bug screens over the furnace vent.
• Shut the furnace down immediately if soot appears at the vent, ignition is delayed, or cycling is erratic, then contact qualified service.

Official sources

• Suburban Gas Furnace Operation Guide
• Frequently Asked Questions about Suburban RV Products

Related fault codes

• Suburban/Atwood lock out — Furnace