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TROUBLESHOOTING
Does the power switch
provide power to the
control panel?
Step 1
YES
YES
Step 2
Is Disable jumper intact? (J1)
YES
Do the combustion air
Step 3
blowers come on?
YES
Step 4
Are the blower lights
illuminated?
YES
Is 24VAC at PS on
ignition module? Is
connecting plug
Step 5
Does igniter prove?
YES
Is the flame
sensor signal to
the ignition
Step 6
module greater
than 1 uA DC?
YES
Step 7
Is the unit running?
NO
Call our Technical Service Department
1-800-927-2975 Outside California
1-800-627-2975 Inside California
NO
Is there a Call For
Heat?
NO
NO
NO
Is 24VAC at present at TH (J3 & J12 on CPW
board and orange wire on ignition module)?
NO
Is air pressure switch(s) and
J2 of CPW board (N.O.)
YES
Does air pressure switch(s)
have correct pressure?
secure?
NO
Check Amp draw during
heat-up for greater than
3.1 Amps.
NO
NO
YES
Check the switch
and/or line voltage
Unit is in standby mode.
Reattach.
Is there 120VAC at J8
Connector on the CPW board?
YES
powered?
NO
Is there continuity from the
fan relay to fan(s)?
(1.4" W.C.)
YES
NO
Is air switch
YES
bouncing?
NO
Replace HSI
Are the gas valve
settings correct?
YES
Is static and dynamic inlet
manifold gas pressure correct?
Is downdraft present?
NO
The unit is okay
50
Replace ignition module
Check all safety limit
devices and voltage from
the transformer to J10 on
CPW board.
NO
Does F2 on ignition module
have 120VAC?
YES
YES
NO
Check flow switch, all
connectors on CPW board
and controller.
Check the fan relay. Is there
120VAC at K3 relay?
YES
YES
Replace fan relay
Replace fan
Replace air
pressure switch
Correct the air settings or
you may have to clean
burners, heat exchanger
and/or air filter.
YES
Readjust to 3.5" W.C.
gas.
NO
Is the unit running?
NO
Replace gas valve
YES
Clean or replace flame sensor
NO
NO
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