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 on high stage;

 

E8

ξ

High stage pressure

 

PS2

E8

ξ

High stage pressure switch

ξ

Replace high stage pressure

 

ξ

Turn power OFF prior to

 

 

 

 

 

furnace operates normally on low stage.

 

 

switch circuit is closed at

 

CLOSED

 

 

 

contacts sticking.

 

switch.

 

 

repair.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ Integrated control module LED display

 

 

 

 

start of heating cycle.

 

 

 

 

ξ

Shorts in pressure switch circuit

ξ

Repair short in wiring

 

ξ

Replace pressure switch

 

 

 

 

 

provides E8 error code.

 

 

 

ξ Induced draft blower is

 

 

 

 

 

wiring.

 

 

 

 

 

with correct replacement

 

 

 

 

 

 

 

 

 

 

 

operating.

 

 

 

 

 

 

 

 

 

 

 

 

part.

 

 

 

 

 

 

 

 

 

 

ξ Furnace is operating on

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

low stage only

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Furnace fails to operate on high stage;

 

E9

ξ

High stage pressure

 

PS2 OPEN

E9

ξ

Pressure switch hose blocked

ξ

Inspect pressure switch hose.

 

ξ

Turn power OFF prior to

 

 

 

 

 

furnace operates normally on low stage.

 

 

switch circuit is not

 

 

 

 

 

pinched, or connected

 

Repair/replace if necessary.

 

 

repair.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ Integrated control module LED display

 

 

 

 

closed.

 

 

 

 

 

improperly.

ξ

Inspect flue and/or inlet air

 

ξ

Replace pressure switch

 

 

 

 

 

provides E9 error code.

 

 

 

ξ Induced draft blower is

 

 

 

 

ξ Blocked flue and/or inlet air pipe,

 

piping for blockage, proper

 

 

with correct replacement

 

 

 

 

 

 

 

 

 

 

 

operating.

 

 

 

 

 

blocked drain system or weak

 

length, elbows, and termination.

 

 

part.

 

 

 

 

 

 

 

 

 

 

ξ Furnace is operating on

 

 

 

 

 

induced draft blower.

 

Check drain system. Correct as

 

ξ

Replace induced draft

 

 

 

 

 

 

 

 

 

 

 

low stage only

 

 

 

 

ξ Incorrect pressure switch set

 

necessary.

 

 

blower with correct

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

point or malfunctioning switch

ξ

Check induced draft blower

 

 

replacement part.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

contacts.

 

performance. Correct as

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ Loose or improperly connected

 

necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

wiring.

ξ

Correct pressure switch set point

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

or contact motion.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Tighten or correct wiring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

connection.

 

 

 

 

 

 

 

 

ξ Furnace fails to operate.

 

EA

ξ Polarity of 115 volt AC

 

REVERSED

EA

ξ

Polarity of 115 volt AC power to

ξ

Review wiring diagram to

 

ξ

Turn power OFF prior to

 

 

 

 

ξ Integrated control module LED display

 

 

is reversed

 

PLTY

 

 

 

furnace or integrated module is

 

correct polarity.

 

 

repair.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

provides EA error code.

 

 

 

 

 

 

 

 

 

 

 

revered.

ξ

Verify proper ground. Correct if

 

 

 

 

 

 

 

 

ξ ComfortNet™ thermostat “Call for

 

 

 

 

 

 

 

 

 

 

ξ

Poor unit ground

 

necessary.

 

 

 

 

 

 

 

 

 

Service” icon illuminated.

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Check and correct wiring.

 

 

 

 

 

 

 

 

ξ ComfortNet™ thermostat scrolls “Check

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Furnace” message.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ Furnace fails to operate.

 

d0

ξ

Data not yet on network.

 

NO NET

d0

ξ

Furnace does not contain any

ξ

Populate shared data set using

 

ξ

Turn power OFF prior to

 

 

55

 

ξ Integrated control module LED display

 

 

 

 

 

 

 

DATA

 

 

 

shared data.

 

memory card.

 

 

repair

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Use memory card for the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

provides d error code.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

specific model.

 

 

 

 

ξ ComfortNet™ thermostat “Call for

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Service” icon illuminated.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Insert memory card

 

 

 

 

ξ ComfortNet™ thermostat scrolls “Check

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BEFORE turning power

 

 

 

 

 

Furnace” message.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON. Memory card may be

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

removed after data is

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

loaded.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Turn power OFF before

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

removing memory card.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Error code will be cleared

 

TROUBLESHOOTING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

once data is loaded.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CHART

Page 55
Image 55
Goodman Mfg CVC9/95, MVC95 installation instructions Chart, Message

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.