Intertek ACVC96 Service Instructions Manual page 46

TROUBLESHOOTING
Symptoms of Abnormal
Diagnostic/
Operation (Legacy
Status LED
& ComfortNet™
Codes
Thermostat)
• Induced draft blower E2
runs continuously with no
further furnace operation.
• Integrated control module
LED display provides E2
error code.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated.
• ComfortNet™ thermostat
scrolls "Check Furnace"
message.
• Circulator blower E3
runs continuously. No
furnace operation.
• Integrated control
module LED display
provides E3 error code.
• ComfortNet™
thermostat "Call
for Service" icon
illuminated.
• ComfortNet™
thermostat scrolls
"Check Furnace"
message.
• Induced draft blower E4
and circulator blower
runs continuously. No
furnace operation.
• Integrated control
module LED display
provides E4 error code.
• ComfortNet™
thermostat "Call
for Service" icon
illuminated.
• ComfortNet™
thermostat scrolls
"Check Furnace"
message.
• No furnace operation. E5
• Integrated control
module LED display
provides E5 error code.
• ComfortNet™
thermostat displays
"Battery Power"
• Normal furnace E6
operation.
• Integrated control
module LED display
provides E6 error code.
46
ComfortNet™
Thermostat Only
Fault Description
Message
• Low stage PS1 OPEN
pressure switch
circuit is not
closed.
• Primary limit or HIGH LIMIT
auxiliary limit OPEN
circuit is open.
• Rollout limit
circuit is open.
• Flame sensed IMPROPER
with no call for FLAME
heat.
• Open Fuse Not
Displayed
• Flame sense WEAK
micro amp signal FLAME
is low
Possible Causes
Code
E2 • Pressure switch hose
blocked pinched, or
connected improperly.
• Blocked fue and/or inlet
air pipe, blocked drain
system or weak induced
draft blower.
• Incorrect pressure
switch set point or
malfunctioning switch
contacts.
• Loose or improperly
connected wiring.
E3 • Insuffcient conditioned
air over the heat
exchanger. Blocked
flters, restrictive
ductwork, improper
circulator blower
speed, or failed
circulator blower motor.
• Flame rollout.
• Misaligned burners,
blocked fue and/or
air inlet pipe, or failed
induced draft blower.
• Loose or improperly
connected wiring.
E4 • Short to ground in
fame sense circuit.
• Lingering burner fame.
• Slow closing gas valve.
Not • Short in low voltage
Displayed wiring
E6 • Flame sensor is
coated/oxidized.
• Flame sensor
incorrectly positioned
in burner fame.
• Lazy burner fame
due to improper gas
pressure or combustion
air.
Corrective Actions Notes & Cautions
• Inspect pressure switch • Turn power OFF prior
hose. Repair/replace if to repair.
necessary.
• Replace pressure
• Inspect fue and/or inlet switch with proper
air piping for blockage, replacement part.
proper length, elbows,
• Replace induced draft
and termination. Check
blower with proper
drain system. Correct as
replacement part.
necessary.
• Check induced draft
blower performance.
Correct as necessary.
• Correct pressure switch
set point or contact
motion.
• Tighten or correct wiring
connection.
• Check flters and • Turn power OFF
ductwork for blockage. prior to repair.
Clean flters or remove
• See Specifcation
obstruction.
Sheet applicable
• Check circulator to your model* for
blower speed and allowable rise range
performance. Correct and proper circulator
speed or replace blower speed.
motor if necessary.
• See "Vent/Flue Pipe"
• Check burners for section for piping
proper alignment. details.
• Check fue and air inlet
piping for blockage,
proper length, elbows,
and termination.
Correct as necessary.
• Check induced draft
blower for proper
performance. Replace if
necessary.
• Tighten or correct
wiring connection.
• Correct short at fame • Turn power OFF
sensor or in fame prior to repair.
sensor wiring.
• Check for lingering
fame.
• Verify proper operation
of gas valve.
• Locate and correct • Turn power OFF
short in low voltage prior to repair.
wiring
• Replace fuse with
3-amp automotive
type
• Sand fame sensor if • Turn power OFF
coated/oxidized. prior to repair.
• Inspect for proper • Sand fame sensor
sensor alignment. with emery cloth.
• Check inlet air piping • See "Vent/Flue Pipe"
for blockage, proper section for piping
length, elbows, and details.
termination.
• See rating plate for
• Compare current gas proper gas pressure.
pressure to rating plate.
Adjust as needed.