GCES80 Installation Manual

25
Fault Code Reset
The last ve fault codes can be erased from memory by de-
pressing the fault recall switch for 5–10 seconds. At 5 seconds
the LED will be rapid ashed (100 mS on, 100 mS o󰀨) to
indicate that the switch should be released to erase the fault
codes. Once the switch is released the rapid ash will stop
and the fault codes will be erased. The control shall acknowl-
edge the reset of the fault codes by turning o󰀨 the LED for 2
seconds after the switch is released. The LED status will then
return to the normal mode.

Furnace lockout results when a furnace is unable to achieve
ignition after three attempts. It is characterized by a non-func-
tioning furnace and a one ash diagnostic LED code from the
red LED. If the furnace is in “lockout”, it will (or can be) reset
in any of the following ways.
1. Automatic reset. The integrated control module will
automatically reset itself and attempt to resume normal
operations following a one hour lockout period.
2. Manual power interruption. Interrupt 115 volt power to
the furnace for 1 - 20 seconds.
3. Manual thermostat cycle. Lower the thermostat so that
there is no longer a call for heat for 1 - 20 seconds then
reset to previous setting.
NOTE: If the condition which originally caused the lockout still
exists, the control will return to lockout. Refer to the Diagnostic
Chart for aid in determining the cause.

T O AVOID ELECTRICAL SHOCK , INJURY OR DEATH , DISCONNECT
ELECTRICAL POWER BEFORE PERFORMING ANY MAINTENANCE . I F YOU
MUST HANDLE THE IGNITER , HANDLE WITH CARE . T OUCHING THE
IGNITER ELEMENT WITH BARE FINGERS , ROUGH HANDLING , OR
VIBRATION COULD DAMAGE THE IGNITER RESULTING IN PREMATURE
FAILURE . O NLY A QUALIFIED SERVICER SHOULD EVER HANDLE THE
IGNITER .
WARNING

The furnace should be inspected by a qualied installer, or
service agency at least once per year. This check should be
performed at the beginning of the heating season. This will
ensure that all furnace components are in proper working or-
der and that the heating system functions appropriately. Pay
particular attention to the following items. Repair or service
as necessary.
• Flue pipe system. Check for blockage and/or leakage.
Check the outside termination and the connections
at and internal to the furnace.
• Heat exchanger. Check for corrosion and/or buildup
within the heat exchanger passageways.
• Burners. Check for proper ignition, burner ame, and
ame sense.

The primary limit control is located on the partition panel and
monitors heat exchanger compartment temperatures. It is an
automatic reset, temperature sensor. The limit guards against
the overheating resulting from insu󰀩cient air passing over the
heat exchanger.

The auxiliary limit control is located either on or near the
circulator blower and monitors heat exchanger compartment
temperatures. The control is an automatic reset, temperature
sensor. It guards against overheating resulting from insu󰀩-
cient air passing over the heat exchanger. The auxiliary limit
control is suitable for both horizontal right and horizontal left
installations. Regardless of airow direction, it does not need
to be relocated.

The rollout limit controls are mounted on the burner/manifold
assembly and monitor the burner ame. They are manual-re-
set, temperature sensors. This limit guards against burner
ames not being properly drawn into the heat exchanger.

The pressure switches are normally-open, negative air pres-
sure-activated switches. They monitor the airow (combustion
air and ue products) through the heat exchanger via pressure
taps located on the induced draft blower. These switches
guard against insu󰀩cient airow (combustion air and ue
products) through the heat exchanger.

The ame sensor is a probe mounted to the burner/manifold
assembly which uses the principle of ame rectication to
determine the presence or absence of ame.


Refer to the troubleshooting chart in the Appendix for assis-
tance in determining the source of unit operational problems.
The red diagnostic LED blinks to assist in troubleshooting the
unit. The number of blinks refer to a specic code.
Fault Code Retrieval
Fault recall shall be via momentary push button switch when
held depressed for 2–5 seconds while control is in standby
mode. The control shall ash the last ve status codes that
have occurred. The control will ash the most recent error
rst and the oldest error last (last in rst out). There shall be
2 seconds between codes.