How to Troubleshoot a Goodman Propane Furnace

Review the display on the Goodman furnace. The control panel is designed to pinpoint any problems within the furnace through a series of flashing LED lights. For example, three consecutive flashing lights indicate a malfunction with the pressure switch circuitry, while lights flashing six times mean there's a problem with the power volt polarity. If the control panel is flashing light patterns, review the owner’s manual to determine their meaning.

Turn off power to the furnace. Locate the circuit breaker assigned to it and flip the breaker to the “Off” position. Wait 30 seconds before flipping it back to the “On” position. If the furnace begins to operate normally, it just needed to be reset. If it's still malfunctioning, the issue is with one of its mechanical parts.

Disconnect power by flipping the circuit breaker to the “Off” position and remove the air filter if the furnace is making a loud clanking sound or is not operating normally. Check the side of the filter to determine if it is disposable. If so, replace it. If the filter reads “Permanent,” wash it with a mixture of liquid dishwashing soap and warm water. Gently scrub the filter with a soft brush, rinse it and allow it to air dry. Then put it back in place and turn on the power.

Locate the tank dial on the propane tank. The location of this dial may vary, however, it is typically near the inlet hose. If the tank dial reads less than 15 percent, the propane may be depleted. Contact your propane company to schedule a refill.

Turn off the Goodman furnace and clean the air holes on the side with a damp cloth. Clogged air holes or excess dirt accumulation can cause the furnace to overheat. Locate the circulating motor near the air holes, and remove all dust and debris around the motor and the air filter.