42
Before Leaving an Installation
■
Cycle the furnace with the thermostat at least 3 times. Verify
cooling and fan only operation.
■
Review the Owner’s Manual with the homeowner and discuss
proper furnace operation and maintenance.
■
Leave literature packet near furnace.
Repair and Replacement Parts
When ordering any of the listed functional parts, be sure to
provide the furnace model, manufacturing and serial numbers
with the order.
Although only functional parts are shown in the parts list, all sheet
metal parts, doors, etc., may be ordered by description.
Parts are available from your distributor.
TROUBLESHOOTING
Electrostatic Discharge (ESD) Precautions
NOTE: Discharge static electricity accumulated in the body
before touching the unit. An electrostatic discharge can adversely
affect electrical components.
Use the following steps during furnace installations 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.
NOTE: 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 also.
3. Service the integrated control module or connecting wiring
after following the discharge process in Step 2.
NOTE: Do not recharge your body with static electricity by
moving or shuffling your feet or touching ungrounded
objects. If you touch an ungrounded object, repeat Step 2
before touching the control or wires.
4. Follow steps 1 through 3 before removing a new control from
its container or installing the control on a furnace. Return any
old or new controls to their containers before touching any
ungrounded object.
Fault Recall
The ignition control is equipped with a momentary pushbutton
switch that can be used to display the last 5 faults detected by
the control.
The control must be in Standby Mode (no thermostat inputs) to
use the feature. Depress the pushbutton switch for approximately
2 seconds.
Release the switch when the LED display is turned off. The
diagnostic LED will then display the flash codes associated with
the last 5 detected faults. The order of display is the most recent
fault to the least recent fault.
Resetting from Lockout
Furnace lockout results when a furnace is unable to achieve
ignition after 3 attempts during a single call for heat. It is
characterized by a nonfunctioning furnace and a 1-flash
diagnostic LED code. 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 1-hour lockout period.
2. Manual power interruption. Interrupt 115-volt power to the
furnace for 1 to 20 seconds.
3. Manual thermostat cycle. Lower the thermostat so that there
is no longer a call for heat for 1 to 20 seconds, and 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.”
Functional Parts List
■
Gas Control Valve
■
Blower Motor
■
Gas Manifold
■
Blower Wheel
■
Natural Gas Orifice
■
Blower Mounting Bracket
■
Propane Gas Orifice
■
Blower Cutoff
■
Igniter
■
Blower Housing
■
Flame Sensor
■
Capacitor
■
Rollout Limit Switch
■
Heat Exchanger
■
Primary Limit Switch
■
Door Switch
■
Auxiliary Limit Switch
■
Coil Front Cover
■
Pressure Switch
■
Integrated Control Module
■
Induced Draft Blower
■
Transformer
