Troubleshooting - Intertek ACVC96 Service Instructions Manual

TROUBLESHOOTING

Symptoms of Abnormal Diagnostic/
Operation (Legacy & Status LED
ComfortNet™ Thermostat) Codes
• Furnace fails to operate None
• Integrated control module
LED display provides no
signal.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated
• ComfortNet™ thermostat
scrolls "Check Furnace"
message
• LED display indicates On On
• Furnace fails to operate E0
• Integrated control module
LED display provides E0
error code.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated.
• ComfortNet™ thermostat
scrolls "Check Furnace"
message.
• Furnace fails to operate. E1
• Integrated control module
LED display provides E1
error code.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated.
• ComfortNet™ thermostat
scrolls "Check Furnace"
message.
ComfortNet™
Thermostat Only
Fault Description
Message
• No 115 power to INTERNAL
furnace or no 24 volt FAULT
power to integrated
control module
• Blown fuse or circuit
breaker
• Integrated control
module has an
internal fault
• Normal operation None
• Furnace lockout LOCKOUT
due to an excessive
number of ignition
"retries" (3 total)
• Low stage pressure PS1
switch circuit is CLOSED
closed at start of
heating cycle.
Possible Causes
Code
EE • Manual disconnect switch
OFF , door switch open or
24 volt wire improperly
connected or loose
• Blown fuse or circuit
breaker
• Integrated control module
has an internal fault
None • Normal operation
E0 • Failure to establish fame.
Cause may be no gas
to burners, front cover
pressure switch stuck
open, bad igniter or igniter
alignment, improper
orifces, or coated/oxidized
or improperly connected
fame sensor.
• Loss of fame after
establishment. Cause
may be interrupted gas
supply, lazy burner fames
(improper gas pressure
or restriction in fue and/
or combustion air piping),
front cover pressure switch
opening, or improper
induced draft blower
performance.
E1 • Low stage pressure switch
contacts sticking.
• Shorts in pressure switch
circuit wiring.
Corrective Actions Notes & Cautions
• Assure 115 and 24 • Turn power OFF prior
volt power to furnace to repair.
and integrated control
• Replace integrated
module.
control module fuse
• Check integrated control with 3A automotive
module fuse (3A). fuse.
Replace if necessary.
• Read precautions
• Check for possible in "Electrostatic
shorts in 115 and 24 Discharge" section of
volt circuits. Repair as manual.
necessary.
• Replace control with
• Replace bad integrated correct replacement
control module. part
• None • Normal operation
• Locate and correct gas • Turn power OFF prior
interruption. to repair.
• Check front cover • Igniter is fragile,
pressure switch operation handle with care.
(hose, wiring, contact
• Sand fame sensor
operation). Correct if
with emery cloth.
necessary.
• See "Vent/Flue Pipe"
• Replace or realign igniter.
section for piping
• Check fame sense details.
signal. Sand sensor if
coated and/or oxidized.
• Check fue piping for
blockage, proper length,
elbows, and termination.
• Verify proper induced
draft blower performance.
• Replace low stage • Turn power OFF prior
pressure switch. to repair.
• Repair short in wiring. • Replace pressure
switch with proper
replacement part.
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