42
Diagnostic Chart
WARNING
High voltage!
To avoid personal injury or
death due to electrical shock,
disconnect electrical power
BEFORE performing any service or
maintenance.
Refer to the
Troubleshooting Chart
in the back of this
manual for assistance in determining the source of unit
operational problems. The 7-segment LED displays will
display an error code that may contain a letter and number.
The error code may be used to assist in troubleshooting
the unit.
Resetting From Lockout
Furnace lockout results when a furnace is unable to
achieve ignition after three attempts during a single call for
heat. It is characterized by a non-functioning furnace and
an
EE0
code displayed on the 7-segment display. 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.
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
Troubleshooting Chart
for
aid in determining the cause.
MAINTENANCE
Annual Inspection
WARNING
To avoid electrical shock, injury or
death, disconnect electrical power
before performing any maintenance.
If you must handle the igniter,
handle with care. Touching the
igniter element with bare fingers,
rough handling or vibration could
damage the igniter resulting in
premature failure. Only a qualified
sericer should ever handle the
igniter.
Flame Sensor
The flame sensor is a probe mounted to the burner/
manifold assembly which uses the principle of flame
rectification to determine the presence or absence of flame.
Burner Flame
Figure 65
TROUBLESHOOTING
Electrostatic Discharge (ESD) Precautions
NOTE: Discharge body’s static electricity before
touching unit. An electrostatic discharge can
adversely affect electrical components.
Use the following precautions during furnace installation
and servicing to protect the integrated control module
from damage. By putting the furnace, the control, and
the person at the same electrostatic potential, these steps
will help avoid exposing the integrated control module to
electrostatic discharge. This procedure is applicable to
both installed and uninstalled (ungrounded) furnaces.
1.
Disconnect all power to the furnace. Do not touch
the integrated control module or any wire connected
to the control prior to discharging your body’s
electrostatic charge to ground.
2. Firmly touch a clean, unpainted, metal surface of the
furnace away from the control. Any tools held in a
person’s hand during grounding will be discharged.
3. Service integrated control module or connecting
wiring following the discharge process in step 2.
Use caution not to recharge your body with static
electricity; (i.e., do not move or shuffle your feet, do
not touch ungrounded objects, etc.). If you come
in contact with an ungrounded object, repeat step 2
before touching control or wires.
4.
Discharge your body to ground before removing a
new control from its container. Follow steps 1 through
3 if installing the control on a furnace. Return any old
or new controls to their containers before touching
any ungrounded object.
