Amana xMVC96 series Installation Instructions Manual page 50

T
ROUBLESHOOTING
Symptoms of Abnormal
Diagnostic/
Operation (Legacy
Status LED
& ComfortNet™
Codes
Thermostat)
• Furnace fails to operate. E7
• Integrated control
module LED display
provides E7 error code.
• ComfortNet™
thermostat "Call
for Service" icon
illuminated.
• ComfortNet™
thermostat scrolls
"Check Furnace"
message.
• Furnace fails to operate E8
on high stage; furnace
operates normally on low
stage.
• Integrated control module
LED display provides E8
error code.
• Furnace fails to operate E9
on high stage; furnace
operates normally on low
stage.
• Integrated control module
LED display provides E9
error code.
• Furnace fails to operate. EA
• Integrated control module
LED display provides EA
error code.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated.
• ComfortNet™ thermostat
scrolls "Check Furnace"
message.
• Integrated control EF
module LED display EF
error code.
• ComfortNet™ thermostat
"Call for Service" .
• Furnace fails to operate. d0
• Integrated control module
LED display provides d0
error code.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated.
• ComfortNet™ thermostat
scrolls "Check Furnace"
message.
C
HART
ComfortNet™
Thermostat Only
Fault Description
Message
• Problem with IGNITER
igniter circuit. FAULT
• High stage PS2 CLOSED
pressure switch
circuit is closed
at start of heating
cycle.
• Induced draft
blower is
operating.
• Furnace is
operating on low
stage only
• High stage PS2 OPEN
pressure switch
circuit is not
closed.
• Induced draft
blower is
operating.
• Furnace is
operating on low
stage only
• Polarity of 115 volt REVERSED
AC is reversed PLTY
• Aux switch open Aux Alarm
Fault
• Data not yet on NO NET
network. DATA
Possible Causes
Code
E7 • Improperly connected
igniter.
• Shorted igniter.
• Poor unit ground.
• Igniter relay fault on
integrated control
module.
E8 • High stage pressure
switch contacts sticking.
• Shorts in pressure
switch circuit wiring.
E9 • 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.
EA • Polarity of 115 volt AC
power to furnace or
integrated module is
revered.
• Poor unit ground
EF • High water level in the
evaporation coil.
d0 • Furnace does not
contain any shared data.
50
Corrective Actions Notes & Cautions
• Check and correct • Turn power OFF
wiring from integrated prior to repair.
control module to
• Replace igniter with
igniter.
correct replacement
• Replace shorted igniter. part.
• Check and correct unit • Replace control with
ground wiring. correct replacement
part.
• Check igniter output
from control. Replace if
necessary.
• Replace high stage • Turn power OFF prior
pressure switch. to repair.
• Repair short in wiring • Replace pressure
switch with proper
replacement part.
• 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.
• Review wiring diagram to • Turn power OFF prior
correct polarity. to repair.
• Verify proper ground.
Correct if necessary.
• Check and correct
wiring.
• Check overfow pan and • Turn power OFF prior
service. to service.
• Populate shared data • Turn power OFF prior
set using memory card. to repair
• Use memory card for
the specifc model.
• Insert memory card
BEFORE turning
power ON. Memory
card may be removed
after data is loaded
and power is turned
off.
• Error code will be
cleared once data is