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Table 6. Cad Cell Resistance when sensing flame
Led Flashes
Cad Cell Resistance in Ohms
0 - 400
400 - 800
800 - 1,600
>1600
1
2
3
4
a. If indicator light stops flashing and
ignition remains off, primary con-
trol could be defective. If line
voltage is present at the ignitor
terminals, but there is no ignition,
the ignitor is probably defective and
needs to be replaced.
b. If indicator light stops flashing, burner
turns on, but control locks out again,
check cad cell. If cad cell is Okay,
replace primary control.
c. If Indicator light continues to flash at
½ second on. ½ second off, verify
that control is not in restricted mode,
if restricted mode, reset it. If not in
restricted mode, replace R7184.
d. If indicator light stays off while the
flame is on, check cad cell sighting
for view of flame.
e. If burner locks out, check cad cell
resistance.
f. If burner keeps running, system is
Okay.
g. If indicator light is off, check cad
cell assembly after disconnecting
line voltage power.
C. Burner will not start, and indicator
light is flashing at 2 second on, 2
second off.
Hold the reset button down for 1-2
seconds. If indicator light continues to
flash, wait for 60-70 seconds. If it still
continues to flash, replace the primary
control.
D. To Check Cad Cell Resistance.
Press and release the button during the
run mode. The light will flash to indicate the
cad cell resistance. For proper burner
operation, it is important that the cad cell
resistance reading is not over 1600 Ohms.
For cad cell resistance, see Table 6.
Summary of Contents for CMF 100-PG
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