GMES80 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 qualied 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 insucient 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 airow 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 airow (combustion
air and ue products) through the heat exchanger via pressure
taps located on the induced draft blower. These switches
guard against insucient airow (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 rectication 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 specic 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.