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

Circulator blower runs continuously. No

 

E3

ξ

Primary limit or

 

HIGH

E3

ξ

Insufficient conditioned air over

ξ

Check filters and ductwork for

ξ

Turn power OFF prior to

 

 

 

furnace operation.

 

 

auxiliary limit circuit is

 

LIMIT

 

 

 

the heat exchanger. Blocked

 

blockage. Clean filters or

 

repair.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ Integrated control module LED display

 

 

 

 

open.

 

OPEN

 

 

 

filters, restrictive ductwork,

 

remove obstruction.

ξ

See Specification Sheet

 

 

 

provides E3 error code.

 

 

 

ξ Rollout limit circuit is

 

 

 

 

 

improper circulator blower speed,

ξ

Check circulator blower speed

 

applicable to your model

 

 

ξ ComfortNet™ thermostat “Call for

 

 

 

 

open.

 

 

 

 

 

or failed circulator blower motor.

 

and performance. Correct speed

 

for allowable rise range

 

 

 

Service” icon illuminated.

 

 

 

 

 

 

 

 

 

 

ξ

Flame rollout.

 

or replace blower motor if

 

and proper circulator

 

 

ξ ComfortNet™ thermostat scrolls “Check

 

 

 

 

 

 

 

 

 

 

ξ Misaligned burners, blocked flue

 

necessary.

 

speed.

 

 

 

Furnace” message.

 

 

 

 

 

 

 

 

 

 

 

and/or air inlet pipe, or failed

ξ

Check burners for proper

ξ

See "Vent/Flue Pipe"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

induced draft blower.

 

alignment.

 

section for piping details.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Loose or improperly connected

ξ

Check flue and air inlet piping

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

wiring.

 

for blockage, proper length,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

elbows, and termination. Correct

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

as necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Check induced draft blower for

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

proper performance. Replace if

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Tighten or correct wiring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

connection.

 

 

 

 

 

ξ

Induced draft blower and circulator blower

 

E4

ξ Flame sensed with no

 

IMPROPER

E4

ξ

Short to ground in flame sense

ξ

Correct short at flame sensor or

ξ

Turn power OFF prior to

 

 

 

runs continuously. No furnace operation.

 

 

call for heat.

 

FLAME

 

 

 

circuit.

 

in flame sensor wiring.

 

repair.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ Integrated control module LED display

 

 

 

 

 

 

 

 

 

 

ξ

Lingering burner flame.

ξ

Check for lingering flame.

 

 

 

 

 

 

provides E4 error code.

 

 

 

 

 

 

 

 

 

 

ξ

Slow closing gas valve.

ξ

Verify proper operation of gas

 

 

 

 

 

ξ ComfortNet™ thermostat “Call for

 

 

 

 

 

 

 

 

 

 

 

 

 

 

valve.

 

 

 

 

 

 

Service” icon illuminated.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ ComfortNet™ thermostat scrolls “Check

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Furnace” message.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

No furnace operation.

 

E5

ξ

Open Fuse

 

Not

Not

ξ

Short in low voltage wiring

ξ

Locate and correct short in low

ξ

Turn power OFF prior to

 

 

ξ Integrated control module LED display

 

 

 

 

 

Displayed

Displayed

 

 

 

 

voltage wiring

 

repair.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

54

 

 

provides E5 error code.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Replace fuse with 3-amp

 

ξ

ComfortNet™ thermostat displays

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

automotive type

 

 

 

“Battery Power”.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Normal furnace operation.

 

E6

ξ Flame sense micro amp

 

WEAK

E6

ξ

Flame sensor is coated/oxidized.

ξ

Sand flame sensor if

ξ

Turn power OFF prior to

 

 

ξ Integrated control module LED display

 

 

signal is low

 

FLAME

 

 

ξ

Flame sensor incorrectly

 

coated/oxidized.

 

repair.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

provides E6 error code.

 

 

 

 

 

 

 

 

 

 

 

positioned in burner flame.

ξ

Inspect for proper sensor

ξ

Sand flame sensor with

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ Lazy burner flame due to

 

alignment.

 

emery cloth.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

improper gas pressure or

ξ

Check inlet air piping for

ξ

See "Vent/Flue Pipe"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

combustion air.

 

blockage, proper length, elbows,

 

section for piping details.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and termination.

ξ

See rating plate for proper

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Compare current gas pressure to

 

gas pressure.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

rating plate. Adjust as needed.

 

 

 

 

 

ξ Furnace fails to operate.

 

E7

ξ

Problem with igniter

 

IGNITER

E7

ξ

Improperly connected igniter.

ξ

Check and correct wiring from

ξ

Turn power OFF prior to

 

 

ξ Integrated control module LED display

 

 

circuit.

 

FAULT

 

 

ξ

Shorted igniter.

 

integrated control module to

 

repair.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

provides E7 error code.

 

 

 

 

 

 

 

 

 

 

ξ

Poor unit ground.

 

igniter.

ξ

Replace igniter with

 

 

ξ ComfortNet™ thermostat “Call for

 

 

 

 

 

 

 

 

 

 

ξ

Igniter relay fault on integrated

ξ

Replace shorted igniter.

 

correct replacement part.

 

 

 

Service” icon illuminated.

 

 

 

 

 

 

 

 

 

 

 

control module.

ξ

Check and correct unit ground

ξ

Replace control with

 

 

ξ ComfortNet™ thermostat scrolls “Check

 

 

 

 

 

 

 

 

 

 

 

 

 

 

wiring.

 

correct replacement part.

 

 

 

Furnace” message.

 

 

 

 

 

 

 

 

 

 

 

 

 

ξ

Check igniter output from

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

control. Replace if necessary.

 

 

 

TROUBLESHOOTING CHART

Page 54
Image 54
Goodman Mfg MVC95, CVC9/95 installation instructions Limit

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.