Cleaning Of Burners; Replacement Parts; Troubleshooting; Cooling Mode - Nordyne R8HE Series Installation Instructions Manual

Cleaning of Burners

If the burners must be cleaned, follow the steps below.
1. Shut off the gas supply to the unit either at the meter
or at a manual valve in the supply piping.
2. Turn off all power to the unit and set the thermostat to
the lowest temperature setting.
3. Remove the louvered control access panel from the
unit.
4. Turn the gas control switch to the OFF position. See
Figure 9 (page 34) for gas valve shut off instructions.
5. Disconnect the wires from the gas valve, ignitor, and
flame sensor. NOTE: Mark wires to prevent miswiring
of unit when reassembling.
CAUTION:
To prevent damage to the unit or internal
components, it is recommended that two
wrenches be used when loosening or tightening
nuts. Do not over tighten!
6. Using two wrenches, separate the ground-joint union
in the gas supply piping at the unit.
7. Remove the piping between the gas valve and the
ground-joint union (if applicable).
8. Remove all screws securing the burner assembly to
the unit.
9. Carefully remove the burner assembly from the unit.
DO NOT DAMAGE THE IGNITER WHILE REMOVING
THE BURNER ASSEMBLY.
10. Inspect the burners for accumulated dust or debris.
If necessary carefully clean them with a soft wire
brush and a vacuum cleaner. DO NOT DAMAGE THE
IGNITER WHILE CLEANING THE BURNER.
11. Replace all the parts in reverse order from which they
were removed.
12. Follow the lighting instructions found on the lower unit
door to return the unit to operation.
13. Verify proper operation after servicing.

REPLACEMENT PARTS

Replacement parts are available through all Nordyne
distributors. Please have the complete model and serial
number of the unit when ordering replacement parts.
ELECTRICAL:
• Blower Control Board
• Capacitors
• Compressors
• Contactors
• Gas Valves
• Hall Effect Sensor
• Ignition Controls
MOTORS:
• Blower Motor
• Fan Motor
• Inducer Blower Motor
COMPONENTS:
• Blower Assembly
• Burner Manifold
• Burners/Orifices
• Cabinet Panels
• Expansion Valves
• Ignitors/Flame Sensors
• Pressure Switches
• Relays
• Temperature Limit Switches
• Thermostats
• Time Delay Relays
• Transformers
• Fan Grille
• Filter/Driers
• Gaskets
• Heat Exchanger

TROUBLESHOOTING

Cooling Mode

If the unit does not operate in the cooling mode, check
the following:
• Verify the thermostat is operating properly
• Verify electrical power to the unit is turned on
• Verify the filters are not dirty
• Verify the service doors are in place
• Verify the 3 amp fuse is operational
• Verify the anti-short cycle timer's 5 minute cycle has
finished.
• Verify the LED flash code (on the blower control board)
against the diagnostic codes listed in
wiring diagrams: Figure 13 (page
38), & Figure 15 (page

Heating Mode

If the unit does not operate in the heating mode, check
the following:
• Verify the thermostat is operating properly
• Verify electrical power to the unit is turned on
• Verify the filters are not dirty
• Verify the gas is turned on and the manual shut-off valve
is open and the gas valve switch is in the ON position
• Verify the service doors are in place
• Verify the flame roll-out switch is closed
• Verify the 3 amp fuse is operational
• Verify the LED flash codes on the furnace ignition control
board against the diagnostic codes listed in
on the wiring diagrams:
14 (page 38), & Figure 15 (page
• Verify the LED flash codes on the motor control board
against the diagnostic codes listed in
wiring diagrams: Figure
DIAGNOSTIC DESCRIPTION
Control Fault (No Power)
L1/Neutral Polarity Fault
1 Hour Lockout
Normal Operation
Pressure Switch Closed Fault
Pressure Switch Open Fault
Open Limit Switch Fault
Motor Fault
Blocked Condensate Drain or Vent
DIAGNOSTIC DESCRIPTION
Low Flame Sensor Signal
Flame Present
Table 5. Furnace Control Board Fault Conditions
DIAGNOSTIC
DESCRIPTION
Control Fault (No Power)
VARIABLE
Normal Operation
SPEED
Motor Fault
FURNACES
Communications Fault
Table 6. Motor Control Board Fault Conditions
Table 5 or on the
37), Figure 14 (page
39).
Table 5
Figure 13 (page 37), Figure
39).
Table 6 or on the
13, Figure 14, & Figure 15.
GREEN LED RED LED
Off Off
Flash Flash
Alternating Flash
On On
On Flash
Flash On
Flash Off
On Off
OFF Flash
YELLOW LED
Continuous Flash
On
GREEN RED
LED LED
Off Off
On On
On Flash
Flash Flash
or
25