507270-03 Page 59 of 60Issue 1917
Planned Service
A service technician should check the following items
during an annual inspection. Power to the unit must be
shut off for safety.
Fresh air grilles and louvers (on the unit and in the
room where the furnace is installed) - Must be open and
unobstructed to provide combustion air.
Burners - Must be inspected for rust, dirt, or signs of water.
Vent pipe - Must be inspected for signs of water, cracked,
damaged or sagging pipe, or disconnected joints.
Unit appearance - Must be inspected for rust, dirt, signs of
water, burnt or damaged wires, or components.
Blower access door - Must be properly in place and
provide a seal between the return air and the room where
the furnace is installed.
Return air duct - Must be properly attached and provide
an air seal to the unit.
Operating performance - Unit must be observed during
operation to monitor proper performance of the unit and
the vent system.
Combustion gases - Flue products should be analyzed
and compared to the unit specications.
Problems detected during the inspection may make it
necessary to temporarily shut down the furnace until the
items can be repaired or replaced.
Instruct the homeowners to pay attention to their
furnace. Situations can arise between annual furnace
inspections that may result in unsafe operation. For
instance, items innocently stored next to the furnace may
obstruct the combustion air supply. This could cause
incomplete combustion and the production of carbon
monoxide gas.
Table 14. Diagnostic Codes
LED Status Fault Description
LED Off
No power to control or control hardware
fault detected
LED On Normal operation
1 Flash Flame present with gas valve off
2 Flashes Pressure switch closed with inducer off
3 Flashes Pressure switch open with inducer on
4 Flashes High limit switch open
5 Flashes Rollout switch open
6 Flashes Pressure switch cycle lockout
7 Flashes Lockout due to no ignition
8 Flashes Lockout due to too many ame dropouts
9 Flashes Incorrect line voltage phasing
Repair Parts List
The following repair parts are available through Allied Air dealers. When ordering parts, include the complete furnace model
number listed on the CSA nameplate. All service must be performed by a licensed professional installer (or equivalent),
service agency, or gas supplier.
Cabinet Parts
• Upper Access Panel
• Blower Access Panel
• Top Cap
Control Panel Parts
• Transformer
• Integrated Control Board
• Door Interlock Switch
Blower Parts
• Blower Wheel
• Motor
• Motor Mounting Frame
• Motor Capacitor
• Blower Housing Cutoff Plate
Heating Parts
• Flame Sensor
• Heat Exchanger Assembly
• Gas Manifold
• Combustion Air Inducer
• Gas Valve
• Main Burner Cluster
• Main Burner Orices
• Pressure Switch
• Ignitor
• Primary Limit Control
• Flame Rollout Switches
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