MN-35949
•
Rev 07
•
01/20
•
Combitherm® CT PROformance™ and CT Classic™ Series Technical Service Manual
•
83
Troubleshooting
Continued from previous page
Is 120V power supplied to the igniter?
No
Repair the wiring issue between the igniter
and the control. Replace the ignition control
as required.
Yes
Is the igniter drawing 1.5 amps?
No
Test the continuity of the igniter, replace if
required.
Yes
Is the gas valve opening? To test for this, remove the
igniter wire and smell for gas at the outlet of the heat
exchanger flue.
No
Replace the faulty ignition control and/or
gas valve.
Yes
Is the burner igniting? Measure the micro amps in
series with the ignition module and the flame sensor.
No
Inspect the burner. Adjust tune of burner to
achieve combustion per Alto-Shaam specific
tuning instruction.
Yes
Is the flame signal above 0.5uA being sensed?
No
Inspect the flame sensor and the flame
sensor wiring by taking a resistance reading
from the flame sensing tip to the end of the
connector.
Yes
Test the flame signal input at CB.
• 0VDC = Flame being sensed at the
Ignition Control(IC), the ignition trial is
successful.
• 5VDC = Flame is not being sensed at the
ignition control.
• If a flame is present, and microamps
are measuring above 0.5uA, replace the
ignition control.
• If a flame is present but the micro amps
are below 0.5uA, inspect the flame sensor
and the associated wiring.
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