UHA L
OW
P
ROFILE
U
NIT
H
EATER
I
NSTALLATION
O
PERATION
AND
S
ERVICE
M
ANUAL
40
13.3 Troubleshooting for Flame Supervision System
NOTE:
Minimum flame probe current 1 μA DC. Typical flame probe current 3-5 μA DC.
Repair or replace as
re
qu
ired.
If pro
b
lems persist, contact
Ro
b
erts-Gordon LLC at
www
.rg-inc.com
Replace ignition control.
Use General
Tro
ub
leshooting section to
trace the fa
u
lt.
Heater Operating
TROUBLESHOOT ENDS.
N
o
Repair or replace as
re
qu
ired.
Is inlet
bu
rner gas press
u
re
correct? Is li
v
e and ne
u
tral
polarity correct? Is
flame pro
b
e circ
u
it correct?
Is there a c
u
rrent flo
w
ing in
the flame pro
b
e circ
u
it
w
ith
no flame present?
Yes
N
o
Does “locko
u
t” occ
u
r
w
hen
there is a flame present?
Yes
Is the connecting lead
damaged? Is the flame pro
b
e
damaged or to
u
ching earthed
components?
N
o
Is the flame present and
at least 1
μ
A DC flame
c
u
rrent?
Connect a DC ammeter in
series
w
ith the flame pro
b
e.
Yes
N
o
Yes
Yes
N
o
START
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.
