Installations Instructions

56
T ROUBLESHOOTING C ODES
Message Code
• • • •
Furnace fails to operate Integrated control module LED display provides IF error code. Comf ortNet th ermostat “ Cal l f or Service” icon illuminated Comf ortNet th ermostat scroll s “ Check Furnace” message
IF
•Integrated
control module has an internal fault
INTERNAL
FAULT
EE • Improper wiring to the furnace or
integrated control module.
• • •
Assure proper wiring to furnace and integrated control module. Verify power to the furnace and integrated control module is stable and within specifications. Replace bad integrated control module.
• • •
Turn power OFF prior to repair. Read precautions in “ Electrostatic Discharge” section of manual. Replace integrated control module with current replacement parts.
• LED display indicates
O
n
On
• Normal operation None None • Normal operation • None • Normal operation
• • • •
Furnace fails to operate Integrated control module LED display provides
E0
error code.
Comf ortNet th ermostat “ Cal l f or Service” icon illuminated. Comf ortNet th ermostat scroll s “ Check Furnace” message.
E0
•Furnace lockout
due to an excessive number of ignition “ retries” or flame “recycles” (3 total).
LOCKOUT E0 •
•
Failure to establish flame. Cause may be no gas to burners, front cover pressure switch stuck open, bad igniter or igniter alignment, improper orif ices, or coated/oxidized or improperly connected flame sensor. Loss of flame after establishment. Cause may be interrupted gas supply, lazy burner flames (improper gas pressure or restriction in flue and/or combustion air piping), front cover pressure switch opening, or improper induced draft blower performance.
• • • • • •
Locate and correct gas interruption. Check front cover pressure switch operation (hose, wiring, contact operation). Correct if necessary. Make sure f urnace is d raining prop erly. Replace or realign igniter. Check flame sense signal. Sand sensor if coated and/or oxidized. Check flue piping for blockage, proper length, elbows, and termination. Verify proper induced draft blower performance.
• • • •
Turn power OFF prior to repair. Igniter is fragile, handle with care. Clean f lame rod with steel wool. See “Vent/Flue Pipe” section for piping details.
• • • •
Furnace fails to operate. Integrated control module LED display provides
E1
error code.
Comf ortNet th ermostat “ Cal l f or Service” icon illuminated. Comf ortNet th ermostat scroll s “ Check Furnace” message.
E1
• Low stage
pressure switch circuit is closed at start of heating cycle.
PS1
CLOSED
E1 •
•
Low stage pressure switch contacts sticking. Shorts in pressure switch circuit wiring.
• •
Replace low stage pressure switch. Repair short in wiring.
• •
Turn power OFF prior to repair. Replace pressure switch with correct replacement part.
• • • •
Induced draft blower runs continuously with no further furnace operation. Integrated control module LED display provides
E2
error code.
Comf ortNet th ermostat “ Cal l f or Service” icon illuminated. Comf ortNet th ermostat scroll s “ Check Furnace” message.
E2
• Low stage
pressure switch circuit is not closed.
PS1
OPEN
E2 •
• • • • •
Pressure switch hose blocked pinched, or connected improperly. Blocked flue and/or inlet air pipe, blocked drain system or weak induced draf t blower. Incorrect pressure switch set point or malfunctioning switch contacts. Loose or improperly connected wiring. Inducer not running. H fitting atmospheric port blocked.
• • • • • • •
Inspect pressure switch hose. Repair/replace if necessary. Inspect f lue and/or inlet air piping f or blockage, proper length, elbows, and termination. Check drain system. Correct as necessary. Check induced draft blower performance. Correct as necessary. Correct pressure switch set point or contact motion. Tighten or correct wiring connection. Clean H f itting.
• • • •
Turn power OFF prior to repair. Replace pressure switch with correct replacement part. Replace induced draft blower with correct replacement part. Take care to assemble/install H fitting in factory configuration.
• • • •
Circulator blower runs continuously. No furnace operation. Integrated control module LED display provides
E3
error code.
Comf ortNet th ermostat “ Cal l f or Service” icon illuminated. Comf ortNet th ermostat scroll s “ Check Furnace” message.
E3
• Primary limit. HIGH
LIMIT
OPEN
E3 •
•
Insuf f icient conditioned air over the heat exchanger. Blocked filters, restrictive ductwork, improper circulator blower speed, or failed circulator blower motor. Loose or improperly connected wiring.
• • •
Check filters and ductwork for blockage. Clean filters or remove obstruction. Check circulator blower speed and performance. Correct speed or replace blower motor if necessary. Tighten or correct wiring connection.
• •
Turn power OFF prior to repair. See Specif ication Sheet applicable to your model for allowable rise range and proper circulator speed.
ComfortNet
Thermostat Only
Symptoms of Abnormal Operation
(Non-communicating
& ComfortNet™ Thermostat)
Possible Causes Corrective Actions Notes & Cautions
Diagnostic
& Status
LED Codes
Fault
Description