5
EN
Furnaces
Operational Issue
Potential Reason
Page
Thermostat is calling for heat – no
fan/no operation
Air conditioner board issue
18
DC voltage issue
26
Defective circuit board
32
Defective motor
36
Defective external relay
37
Defective sail switch
38
Fan runs continuously with
thermostat set to off
Defective circuit board/fan relay on board is stuck closed
32
Defective external relay
37
Visible buildup of soot
Gas pressure issue
26
Combustion wheel is loose
33
Defective motor
36
Defective gas valve
39
Orifice issue
39
Incorrect exhaust tube (AF model furnaces)
41
Circuit board is getting wet on the
AFM series furnace
Door installation issue 26/see specific furnace installation instructions
Circuit board is lying on the floor of the furnace
32
Diagnostics Table
Diagnostic Area Page Diagnostic Area Page
AC Board/Thermostats 18 Electrode 22
Blower Wheel 18 Limit Switch 22
Burner Head 19 Motor 23
Circuit Board 19 Relay 23
Circuit Breaker Switch 21 Sail Switch 24
Combustion Wheel 22 Solenoid/Gas Valve 25
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