Furnace shows E13 and will not ignite, often in very cold conditions.

Safety: Gas pressure adjustments must be done by a licensed gas technician. Do not attempt to adjust the gas regulator yourself.

Steps (homeowner level):

• Check other gas appliances: Verify if stoves, water heaters, or other gas devices are working normally. If all are weak or not working, contact your gas supplier.
• Verify shutoff valves: Ensure all manual gas valves in the line to the Atlantic furnace are fully open.
• Look for icing (LPG): In LPG systems, check for frost or ice on the regulator indicating capacity issues. Contact your LPG provider.

Professional steps: A technician will measure inlet and manifold pressure, inspect the gas piping size, and clean or replace the gas valve if necessary.