Arkansas HVACR NewsMagazine January 2024

HVACR NewsMagazine January 2024

Tech News

Top 10 Gas Furnace Package Unit Problems!

Craig Migliaccio

Before addressing the fuses or switch, it is good idea to test the line voltage (power coming into the disconnect from the building) to determine that power is present. If power is not coming into the disconnect then the electrical issue lies within the building, possibly at the indoor breaker and a licensed electrician should be consulted. However, if power is coming into the disconnect box, the issue is likely with the switch or fuses. If the electrical disconnect uses a non fusible disconnect switch, the switch may not be correctly connected in place, or it may be in the off position. If this is this case, resetting the switch to the proper position should restore power to the unit.

Problem #1: No Power to the Package Unit

On all HVAC systems, power is critical to operation, and a package unit is no different. There several reasons a package unit may lose power, but fortunately determining if this is the problem can be done fairly simply. First, remove the cover plate of the package unit to look at the control board. If the LED light on the control board is lit, there is power to the unit and the problem is something else. If the LED light is not lit, test for voltage at the contactor. If there is no voltage measured at the contactor, move to the electrical disconnect.

If the electrical disconnect uses a fusible disconnect switch, the fuses may be blown or bad. To determine if this is the case, check the resistance across each fuse individually to make sure that they

There are two types of electrical disconnects typically used on outdoor package units; fusible and non-fusible.