Roberts Gorden UHD[X][S][R] 200 User Manual

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UHD S
TANDARD
 D
UCT
 F
URNACE
 I
NSTALLATION
 O
PERATION
 
AND
 S
ERVICE
 M
ANUAL
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13.3 Troubleshooting for Flame Supervision System
NOTE: Minimum flame probe current 1 μA DC. Typical flame probe current 3-5 μA DC.
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.
Repair or replace as 
required.
If problems persist, contact
Roberts-Gordon LLC at
www.rg-inc.com
Replace ignition control.
Use General
Troubleshooting section to 
trace the fault.
Heater Operating
TROUBLESHOOT ENDS.
No
Repair or replace as 
required.
Is inlet burner gas pressure 
correct? Is live and neutral 
polarity correct? Is
flame probe circuit correct?
Is there a current flowing in 
the flame probe circuit with 
no flame present?
Yes
No
Does “lockout” occur when
there is a flame present?
Yes
Is the connecting lead 
damaged? Is the flame probe 
damaged or touching earthed 
components?
No
Is the flame present and
at least 1 μA DC flame 
current?
Connect a DC ammeter in 
series with the flame probe.
Yes
No
Yes
Yes
No
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