Replace

board.

Turn on 115-VAC

power to unit.

Is blower running?

NO

Jumper across screws R & G.

Is

blower running

on cooling

speed?

YES

Is

NO115VAC across EAC-1

& COM?

 

 

 

 

START

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Disconnect all thermostat

 

 

 

 

wires from board.

 

YES

Is 24VAC

YES

 

 

 

 

across screws

 

 

 

 

 

 

 

 

R & C?

NO

Check/Replace:

1.Limit switch

2.Limit shield (if used)

3.Fuse link

4.Auxillary limit switch (if used)

5.Wire harness

NO

Is

NO

115VAC

 

across HI &

 

 

COM?

 

YES

Replace

blower motor

and/or start

capacitor.

Is 24VAC

YES

 

across screws

 

 

 

W & C or

 

 

G & C?

 

 

 

NO

 

 

 

 

 

 

 

 

 

Is

115VACYES across L1 &

L2?

NO

Check/Replace:

1.Unit power

2.Door switch

3.Power harness

Turn off 115-VAC

power to unit.

NO

Are

all thermostat wires to board disconnected?

YES

Replace

board.

YES

Is

24VAC

across screws

R & C?

NO

Check/Replace:

1.3-amp board fuse

2.Transformer

YES

Remove

R & G jumper.

Check pressure tube for leak or crimp; otherwise, replace pressure switch

YES

Is

24VAC

across PL1-2 & screw C on board?

NO

NO

Replace

 

 

 

 

 

 

board.

 

 

 

 

NODoes blower turn

off?

YES

Is heat

exchangerYES pressure drop greater

than 0.35-in.

wc?

NO

YES

Is 24VAC

across pressure

switch N/O contact

&screw C on board?

NO

Repair wire

harness.

Jumper across screws R & W.

Is

inducer motor

on?

NO

Check/Replace:

1.Vent systems

2.Induce wheel

3.Flue choke

4.Inducer voltage

5.Inducer motor bearings

YES

Is

NO

 

unit lit?

 

YES

Is 24VAC

across pressure

switch N/O contact

&screw C on board?

NO

Is

24VAC across gas

valve?

YES

Check/Replace:

 

 

 

1.

Draft safeguard switch

 

 

 

 

 

 

2.

Wire harness

 

 

 

 

 

 

 

 

YES

Check/Replace:

1.

Pilot

 

 

 

 

 

 

2.

Thermocouple

 

 

 

3.

Gas valve

 

 

 

 

 

Replace

YES

Is

115VAC across

Is

blower running NO on heat speed 45

Is

115VAC across

YES

Replace

blower motor

 

inducer motor.

NO

Check/Repair wire harness; otherwise, replace pressure switch.

inducer motor

connector?

NO

Is

24VAC across PL-2 & screw C on board?

YES

Replace

board.

NO

sec after unit

lights?

YES

Is

115VAC

across EAC-1

& COM?

YES

Remove

R & M jumper.

inducer motor

connector?

NO

Is

24VAC across

PL-1 & screw C on board?

NO

Repair wire

harness.

 

 

 

 

and/or start

 

 

 

 

capacitor.

YES

 

 

 

 

 

Replace

 

 

 

 

 

 

 

 

 

 

board.

 

 

 

 

 

 

 

 

 

 

Check/Replace

 

 

 

 

 

 

thermostat

 

 

 

 

 

and/or

 

 

 

 

thermostat wiring.

 

 

 

 

 

 

 

 

NO

After

off-delay YES does blower

turn off?

 

 

 

NO

 

 

 

 

Reconnect all

 

Does unit

thermostat wires.

 

operate?

NOTE: After replacing any component, verify correct operating sequence as indicated by bold arrows.

YES

END OF TEST.

A91253

7

Page 7
Image 7
Carrier 58GFA instruction manual Yes

58GFA specifications

The Carrier 58GFA is a highly regarded gas furnace known for its reliability, energy efficiency, and advanced technology. Designed with the modern homeowner in mind, the 58GFA is engineered to provide effective heating while minimizing energy consumption and operating costs.

One of the standout features of the Carrier 58GFA is its variable-speed blower motor. This technology allows for enhanced airflow control, ensuring consistent temperatures throughout the home. The variable-speed operation enables the furnace to adjust its output based on the heating demands, which not only improves comfort but also increases energy efficiency by running at lower speeds for extended periods.

Another key characteristic of the 58GFA is its two-stage heating system. This dual-stage capability allows the furnace to operate at a lower stage during milder conditions, optimizing energy usage without sacrificing comfort. During peak heating demands, the system can seamlessly transition to full capacity. This feature reduces temperature fluctuations, providing a more stable indoor climate.

The Carrier 58GFA is equipped with high-efficiency burners, achieving impressive Annual Fuel Utilization Efficiency (AFUE) ratings. With an AFUE rating of up to 80%, this furnace competently converts fuel into heat, making it an economical choice for homeowners looking to reduce energy bills. Additionally, the unit complies with environmental standards, contributing to a greener home footprint.

Durability and quiet operation are also notable characteristics of the Carrier 58GFA. The within design includes a robust heat exchanger made of high-quality materials to withstand the rigors of daily use. The noise-reducing technology, including insulated cabinets and quiet motors, ensures that the heating operation remains unobtrusive, maintaining a peaceful home environment.

Moreover, the 58GFA features advanced thermostat compatibility, allowing for integration with smart home systems. This capability allows homeowners to monitor and control their heating system remotely, enhancing convenience and energy management.

In summary, the Carrier 58GFA gas furnace is a leading choice for homeowners seeking energy-efficient heating solutions. With its variable-speed blower, two-stage heating, high AFUE rating, durable construction, and smart compatibility, it stands out as a formidable option in the HVAC market, delivering comfort and performance year after year.