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TABLE 24- FURNACE
ALERT CODES
REVISION: 9
Alert Notification
Fault LED
COM LED
User Interface Display
RECYCLE
RETRY
2 Flash
Device count
RECYCLE LO
RETRY LO
PS3 OPEN
PS3 CLOSED
PS2 OPEN
3 Flash
Device count
PS2 CLOSED
PS1 OPEN
PS1 CLOSED
AUX LIMIT
4 Flash
Device count
HIGH LIMIT
ROLLOUT OPEN
5 Flash
Device count
FLAME ERROR
POLARITY ERR
GND FAULT
6 Flash
Device count
IGNITER ERR
TRIAC ERR
7 Flash
EXT GV ERR
Device count
Solid ON
INT GV ERR
8 Flash
Device count
LO FLAME SNS
9 Flash
Device count
IND LIMIT
SYS COMM CRC
Device count
IND COMM CRC
BLW COMM CRC
10 Flash
BLW COMM ERR
Device count
IND COMM ERR
SYS COMM ERR
Fast Flash
NO SYS CLK
Device count
24V COMM MSMTCH
Solid ON
Device count
CNTRL FAULT
None
Device count
TWIN ERROR
PM DATA ERR
CAP MISMATCH
ID MTR ERR
Device count
None
PM MISSING
PM UNIT ERR
PM MEM ERROR
AC VOLTS LOW
None
Device count
AC VOLTS HI
None
Device count
CHECK FUSE
Y1 OFF ERR
None
Device count
Y1 ON ERR
TS 1 SHORT
TS 1 OPEN
None
Device count
TS 2 SHORT
TS 2 OPEN
¹ Comfort Control will switch system to "OFF" until this fault condition clears
Notes:
D342960P01
18-CD30D1-20-EN
Installer's Guide
CN: 9108T00
Alert
Alert Group
Code
Control Display
Flame lost or Ignition
20
N/A
failure
Soft lockout due to
ERR 22
22
flame lost or ignition
retries
Pressure Switch
N/A
1
Failure
26
ERR 26
High Temp Limit Fault
ERR 87
87
Roll Out Fault
34
ERR 34
Flame Detect Fault
N/A
33
Line Polarity Fault
88
N/A
Ground Fault
ERR 10
10
Ignition Means Fault
ERR 93
93
Gas Valve Fault
4
N/A
Low Flame Signal
ERR 26
26
High Temp Limit Fault
Communication Busy
N/A
90
Fault
ERR 91
91
Communication Fault
Communication
ERR 139
139
Failure
ERR 18
18
Control Failure
N/A
19
Twinning Fault
N/A
114
Bad or Missing PM
ERR 114
N/A
ERR 114
N/A
59
AC Line Fault
N/A
92
Fuse
ERR 101
101
Y1 Relay Failure
Temperature Sensor
N/A
119
Failure
PRINTED FROM: D802247P01 Rev 9
DATE: 2009-6-12
Alert Description
Flame is off when flame should be
detected. Furnace tries to relight
itself.
Furnace tries to light, but no flame is
detected.
10 recycles within a single call for
heat will cause 1hr lockout.
3 ignition attempts in a row within a
single call for heat results in 1 hr
lockout.
Open Pressure Switch, third stage
Shorted Pressure Switch, third stage
Open Pressure Switch, second stage
Shorted Pressure Switch, second
stage
Open Pressure Switch, first stage
Shorted Pressure Switch, first stage
Open Reverse Flow - Heat exchanger
temperature too high. Could be
caused by low airflow or fan failure.
Open High Limit - Heat exchanger
temperature too high. Could be
caused by low airflow or fan failure.
Open flame rollout
Flame detected, should not be
present
Voltage reverse polarity
Occurs when proper earth ground is
not detected.
Igniter fault
Triac fault
Control senses 24V present at the gas
valve when it should not be present.
Control tried to turn on gas valve, but
24V not sensed.
Control senses 24V present at the gas
valve when it should not be present.
Flame current is low, but still strong
enough to allow operation.
Flue gas temperature too high. Could
be caused by low airflow or fan failure.
COMM system unrecognized
response
Inducer Motor unrecognized response
Blower motor unrecognized response
Blower motor no COMM response ¹
Inducer motor no COMM response
Loss of heat/cool demand
Loss of clock signal
Communication Message has been
detected while configured for 24V
Mode
Internal control failure
Twinning Not Allowed with Variable
Speed
Data Section is Corrupt but PM is
useable
Compressor size does not match
capacity in PM
Blower HP/OEM does not match PM
Data
No PM
Primary Copy of Unit Data File is
Corrupt.
Primary and Secondary copies of Unit
Data File are Corrupt
Voltage too low
Voltage too high
24V Fuse Open
Y1 Output OFF when it should be ON
Y1 Output ON when it should be OFF
Temperature sensor 1 shorted.
Temperature sensor 1 open.
Temperature sensor 2 shorted.
Temperature sensor 2 open.
55
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