35
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Before servicing, disconnect all electrical
power to furnace.
• When servicing controls, label all wires prior
to disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.”
WARNING:
RISQUE DE CHOC ÉLECTRIQUE, D’INCENDIE
OU D’EXPLOSION
Le non-respect des avertissements de sécurité
pourrait entraîner
un fonctionnement dangereux
de l’appareil, des blessures graves, la mort ou
des dommages matériels.
Un entretein incorrect pourrait entraîner un
fonctionnement dangereux de l’appareil, des
blessures graves, la mort ou des dommages
matériels
• Couper toute alimentation électrique au
générateur d’air chaud avant de prodéder
aux travaux d’entretein.
• Au moment de l’entretien des commandes,
étiquetez tous les fils avant de les débrancher.
S’assurer de les raccorder correctement.
• S’assurer que l’appareil fonctionne
adéquatement aprés l’entretien.
AVERTISSEMENT
:
Table 6
DIAGNOSTIC DESCRIPTION
GREEN
LED
RED
LED
Control Fault (No Power)
Off
Off
L1/Neutral Polarity Fault
Flash
Flash
1 Hour Lockout
Alternating Flash
Normal Operation
On
On
Pressure Switch Closed Fault
On
Flash
Pressure Switch Open Fault
Flash
On
Open Limit Switch Fault
Flash
Off
DIAGNOSTIC DESCRIPTION
YELLOW LED
Low Flame Sensor Signal
Continuous Flash
Flame Present
On
Table 6.
Control Board Fault Codes
TROUBLESHOOTING
If the furnace fails to operate check the following:
• Is the thermostat operating properly?
• Are the blower compartment door(s) in place?
• Is the furnace disconnect closed?
• Has the circuit breaker tripped or the control board fuse
burned open?
• Is the gas turned on?
• Are any manual reset switches open?
• Is the filter dirty or plugged?
• Is the flame sensor coated? Remove and clean with
steel wool.
(Do not use emery cloth or sandpaper!)
• Is there blockage in the condensate drain switch? Also
verify that there is no double trapping of condensate.
• Is the secondary heat exchanger free of debris and
clogs?
• Is evaporator coil clean and free of debris
(If applicable).
• Are all the LED’s on the furnace control board constantly
ON? If not, refer to
) to determine fault
condition.
IMPORTANT NOTE:
The furnace will lock out after 5 failed attempts for
ignition and will try again every hour if the call for
heat remains.
• If the Inducer Blower is operating, and items above have
been verified, check the blower limit switch and reset if
necessary. See
location.
• If the furnace operates when the blower limit switch is
reset, contact a qualified service technician to identify
and repair the problem.
• If the furnace still doesn’t operate, check the flame roll-
• If the furnace operates when the flame rollout switch is
reset, contact a qualified service technician to identify
and repair the problem.
•
Proper maintenance is most important to achieve the best
performance from a furnace. Follow these instructions
for years of safe, trouble free operation.
• These maintenance instructions are primarily intended
to assist qualified technicians experienced in the proper
maintenance and operation of this appliance.
• Always reinstall the doors on the furnace after servicing
or cleaning/changing the filters.
Do not operate the
furnace without all doors and covers in place.
• Verify the thermostat is properly installed and will not be
affected by drafts or heat from lamps or other appliances.
• To achieve the best performance and minimize
equipment failure it is recommended that a yearly
MAINTENANCE
Summary of Contents for M4RC-072D-35C
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