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19.4
TROUBLESHOOTING FLOWCHART
Call For High Heat
Air Proving Switch
NO
Five Minute Wait For
Proved Closed Within 30
Seconds
YES
High Stage Main Valve
Opens Circulating Air
Fan To High Heat Speed
High Heat Call Ends Low
Heat Demand Remains
High Stage Main Valve
And Call For High Heat
Circulating Air Fan De-
Energized
SEQUENCE OF OPERATION
Troubleshooting Flowchart
Apply Power To Furnace
Thermostat Calls For Heat
Air Proving Switches
Proved Open & Limit
Circuit Closed
YES
Combustion Air Blower On
Air Proving Switch Proved
Closed Within 60 Seconds?
YES
Prepurge 15 Seconds
HSI Energized 5 Seconds
(10 Seconds on Retries)
Low Main Valve Opens
Main Burner Lights And Is Sensed
During Trial For Ignition?
YES
HSI De-Energized
Low Heat Circulating Air Fan On
After Programmed Delay
Flame Sense Lost?
NO
Retry.
Thermostat Call For Heat Ends
Low Main Valve Closes
Combustion Air Blower Off After Pos t
Purge (5 Seconds)
Circulating Air Fan Off After
Programmed Delay
Wait For Next Call For Heat
Wait For Limit Circuit
NO
Wait For Air Proving Switch
to Close and/or Reset
to Open. Flash "3"
60 Minute Wait Period
NO
Combustion Air Blower Off
Flash "2"
30 Seconds Between
Trial Purge
NO
Low Main Valve Closes
Failed Trials For Ignition
YES
Less Than Four During
This Ignition Sequence?
NO
YES
Low Main Valve Closes
Flame Sense Lost More Than Four
Times In This Call For Heat?
YES
H23.3.2
55
IOM
of Flame Rollout.
Flash "1"
1 Hour Lockout Reset
Delay. Flash "4"
Circulating Air Fan Off
After Programmed
Delay
Combustion Air Blower
Off After Post Purge
NO
W415-2306 / C / 09.22.20
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