Low Heat - Gas Pressure Low - Gas Line too Small

Make:  All

Model or Series:  All

Type:  Gas Furnace

Problem Description:  Low heat

Observed Symptoms:  

1. Low discharge air temperature.
2. Manifold gas pressure too low.

Solution:  Installed larger gas line to furnace.

Additional Information: 

• Checked the inlet gas pressure - 10" with furnace off, less than 4"when furnace comes on.
• Checked the gas line chart and found that 1/2" gas line was too small for furnace.