Goodman Mfg VC8 instruction manual Troubleshooting, Chart, Message

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.

41

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

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