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UHA S
U
H
TANDARD
NIT
EATER
14.3 Troubleshooting for Flame Supervision System
To measure flame current, connect a 0 - 50 μA DC meter in series with the flame probe. If the meter
reads negative values, then reverse the test leads.
START
Connect a DC ammeter in
series with the flame probe.
Is the flame present and
at least 1 μA DC flame
current?
Is there a current flowing in
the flame probe circuit with
no flame present?
Does "lockout" occur when
there is a flame present?
Heater Operating
TROUBLESHOOT ENDS.
NOTE: Minimum flame probe current 1 μA DC. Typical flame probe current 3-5 μA DC.
38 of 49
I
O
NSTALLATION
PERATION AND
Troubleshooting section to
No
Yes
Is the connecting lead
damaged? Is the flame probe
Yes
damaged or touching earthed
No
Is inlet burner gas pressure
correct? Is live and neutral
Yes
polarity correct? Is
flame probe circuit correct?
Repair or replace as
No
If problems persist, contact
No
www.addison-hvac.com
S
M
ERVICE
ANUAL
Use General
trace the fault.
Yes
components?
Yes
No
necessary.
Addison at
Repair or replace as
necessary.
Replace ignition control.
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