Symptoms of Abnormal Operation

 

 

Diagnostic/Status

 

 

 

 

 

ComfortNet™

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fault Description

 

 

Thermostat Only

 

 

Possible Causes

 

 

Corrective Actions

 

 

Notes & Cautions

 

 

 

 

 

(Legacy & ComfortNet™ Thermostat)

 

 

LED Codes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Message

Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ Furnace fails to operate.

 

b4

ξ

Circulator blower motor

 

MOTOR

b4

ξ

Abnormal motor loading, sudden

ξ

Check filters, filter

 

ξ Turn power OFF prior to

 

 

 

ξ Integrated control module LED display

 

 

 

 

senses a loss of rotor

 

TRIPS

 

 

 

change in speed or torque, sudden

 

grills/registers, duct system, and

 

repair.

 

 

 

 

provides b4 error code.

 

 

 

 

control.

 

 

 

 

 

blockage of furnace air inlet or

 

furnace air inlet/outlet for

 

 

 

 

 

 

ξ ComfortNet™ thermostat “Call for

 

 

 

ξ

Circulator blower motor

 

 

 

 

 

outlet.

 

blockages.

 

 

 

 

 

 

 

Service” icon illuminated.

 

 

 

 

senses high current.

 

 

 

 

ξ

High loading conditions, blocked

 

 

 

 

 

 

 

 

 

ξ ComfortNet™ thermostat scrolls “Check

 

 

 

 

 

 

 

 

 

 

 

filters, very restrictive ductwork,

 

 

 

 

 

 

 

 

 

 

Furnace” message.

 

 

 

 

 

 

 

 

 

 

 

blockage of furnace air inlet or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

outlet.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ Furnace fails to operate.

 

b5

ξ

Circulator blower motor

 

MTR LCKD

b5

ξ

Obstruction in circulator blower

ξ

Check circulator blower for

 

ξ Turn power OFF prior to

 

 

 

ξ Integrated control module LED display

 

 

 

 

fails to start 10

 

ROTOR

 

 

 

housing.

 

obstructions. Remove and

 

repair

 

 

 

5

 

 

 

 

 

consecutive times.

 

 

 

 

ξ

Seized circulator blower motor

 

repair/replace wheel/motor if

 

ξ Replace motor with correct

 

 

 

 

provides b error code.

 

 

 

 

 

 

 

 

 

 

 

bearings.

 

necessary.

 

replacement part.

 

 

 

ξ ComfortNet™ thermostat “Call for

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Service” icon illuminated.

 

 

 

 

 

 

 

 

 

 

ξ

Failed circulator blower motor.

ξ

Check circulator blower motor

 

ξ Replace wheel with correct

 

 

 

ξ ComfortNet™ thermostat scrolls “Check

 

 

 

 

 

 

 

 

 

 

 

 

 

 

shaft rotation and motor.

 

replacement part.

 

 

 

 

Furnace” message.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace motor if necessary.

 

 

 

 

 

 

ξ Furnace fails to operate.

 

b6

ξ

Circulator blower motor

 

MOTOR

b6

ξ

High AC line voltage to furnace.

ξ

Check power to furnace. Verify

 

ξ Turn power OFF prior to

 

 

 

ξ Integrated control module LED display

 

 

 

 

shuts down for over or

 

VOLTS

 

 

ξ

Low AC line voltage to furnace.

 

line voltage to furnace is within

 

repair.

 

 

 

 

provides b6 error code.

 

 

 

 

under voltage condition.

 

 

 

 

ξ

High ambient temperatures.

 

the range specified on the

 

 

 

 

 

 

ξ ComfortNet™ thermostat “Call for

 

 

 

ξ

Circulator blower motor

 

 

 

 

 

 

 

 

furnace rating plate.

 

 

 

 

 

 

 

Service” icon illuminated.

 

 

 

 

shuts down due to over

 

 

 

 

 

 

 

ξ

See "Product Description" and

 

 

 

 

 

 

ξ ComfortNet™ thermostat scrolls “Check

 

 

 

 

temperature condition on

 

 

 

 

 

 

 

 

"Location Requirements &

 

 

 

 

 

 

 

Furnace” message.

 

 

 

 

power module.

 

 

 

 

 

 

 

 

Considerations" for furnace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

installation requirements.

 

 

 

 

 

 

ξ Furnace fails to operate.

 

b7

ξ

Circulator blower motor

 

MOTOR

b7

ξ

Error with integrated control

ξ

Check integrated control module.

 

ξ Turn power OFF prior to

 

 

 

ξ Integrated control module LED display

 

 

 

 

does not have enough

 

PARAMS

 

 

 

module.

 

Verify control is populated with

 

repair.

 

 

 

7

 

 

 

 

 

information to operate

 

 

 

 

ξ

Motor has a locked rotor

 

correct shared data set. See data

 

ξ Replace with correct

 

 

 

 

provides b error code.

 

 

 

 

properly.

 

 

 

 

 

condition.

 

errors above for details.

 

replacement part(s).

 

 

 

ξ ComfortNet™ thermostat “Call for

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Service” icon illuminated.

 

 

 

ξ Motor fails to start 40

 

 

 

 

 

 

 

ξ

Check for locked rotor condition

 

ξ Use memory card for the

 

 

57

ξ ComfortNet™ thermostat scrolls “Check

 

 

 

 

consecutive times.

 

 

 

 

 

 

 

 

(see error code above for

 

specific model.

 

 

 

Furnace” message.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

details).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ Furnace operates at reduced performance

 

b9

ξ

Airflow is lower than

 

LOW ID

b9

ξ

Blocked filters.

ξ

Check filters for blockage.

 

ξ Turn power OFF prior to

 

 

 

 

or operates on low stage when high stage is

 

 

 

 

demanded.

 

AIRFLOW

 

 

ξ

Restrictive ductwork.

 

Clean filters or remove

 

repair.

 

 

 

 

expected.

 

 

 

 

 

 

 

 

 

 

ξ

Undersized ductwork.

 

obstruction.

 

 

 

 

 

 

ξ Integrated control module LED display

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ Check ductwork for blockage.

 

 

 

 

 

 

9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Remove obstruction. Verify all

 

 

 

 

 

 

 

provides b error code.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

registers are fully open.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Verify ductwork is appropriately

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

sized for system. Resize/replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ductwork if necessary.

 

 

 

 

TROUBLESHOOTING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CHART

Page 57
Image 57
Goodman Mfg CVC9/95, MVC95 installation instructions Trips

MVC95, CVC9/95 specifications

Goodman Manufacturing has established itself as a leader in the HVAC industry, and among its stellar lineup, the Goodman CVC9/95 and MVC95 stand out for their remarkable features, technologies, and efficiency.

The Goodman CVC9/95 is a high-performance gas furnace, designed for homeowners seeking reliability and cost-effective heating solutions. It operates with an impressive 95% Annual Fuel Utilization Efficiency (AFUE), which means that a significant portion of the fuel it consumes is converted into heat. This level of efficiency not only contributes to lower energy bills but also reduces greenhouse gas emissions, making it an environmentally friendly choice.

One of the standout features of the CVC9/95 is its multi-speed ECM blower motor. This technology adjusts the airflow according to the heating demands of the home, ensuring consistent and comfortable temperatures. The ECM motor also operates quietly, enhancing the comfort of your living space without the disruptive noise often associated with traditional furnaces.

The MVC95, on the other hand, offers similar efficiency with its also 95% AFUE rating. This model is equipped with a patented ignition system that enhances reliability with minimal maintenance needs. Its durable construction includes a heavy-gauge steel cabinet and an insulated blower compartment that minimizes heat loss. This design not only supports optimal performance but also contributes to its longevity.

Both models come with a self-diagnostic control board that provides straightforward troubleshooting capabilities, making it easier for technicians to ensure that your system is operating at peak performance. This feature aids in timely maintenance, which is crucial for extending the lifespan of the unit.

Additionally, Goodman backs their products with a strong warranty, offering a lifetime limited warranty on the heat exchanger and a 10-year limited parts warranty. This assurance provides homeowners peace of mind regarding their investment.

In the landscape of HVAC solutions, the Goodman CVC9/95 and MVC95 models exemplify a commitment to quality, efficiency, and advanced technology. Whether for new constructions or replacements, these furnaces offer superior heating performance coupled with modern conveniences, making them an invaluable choice for homeowners seeking effective climate control solutions. With their low emissions and high efficiency, choosing Goodman means investing in both comfort and sustainability.