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Three TTimes
(Flash PPattern
Begins iin 440
Seconds AAfter
Condition
Occurs.) TThe
Module HHas
Gone iinto SSafety
Lockout.
Is Proper Fuel
Supplied to Heater Inlet?
Connect Proper Fuel
Supply to Heater.
Open All Gas Shutoff
Valves.
Yes
No
Is Proper Gas
Pressure Supplied to
Heater?
Yes
Yes
Provide Proper Gas Supply
Pressure to Heater.
Refer to Dataplate
No
No
Is High Limit
SwitchTripped?
Check Continuity
If High Limit Switch is Tripped,
Reset the Switch and Determine
Cause of High Limit Tripping.
Check for Loose Fan, Low
Voltage, High Gas Pressure, and
Air Restrictions.
Four TTimes
Defective DSI Board Replace DSI Board
Does Two Stage
Gas Control Valve Open?
(Turn Unit On. Should Hear Audible
Click When Valve Opens, Approx. 4-5
Seconds After Power is
Supplied To Unit.
Is Ignitor
Properly
Gapped?
Are
24 Volts Supplied
to Terminal “MV”
on Gas Valve?
Defective Gas Valve.
Replace Gas Valve.
Yes
Yes
Yes
Check Igniter Gap
and Regap, if
Necessary, to
Specifications.
-- Defective Wires or