Sunfire SF-150 Service Manual page 4

Symptom
2. Attempts to fire but does not
establish a flame - cont'd
3. Fires and then fails
Only if fails contintually within
30 seconds
Possible Cause
Transformer/electrodes not
sparking
Combustion blower not properly
adjusted or defective
CAD cell is dirty
CAD Cell is misaligned
CAD cell is defective
Burner settings may need
adjustment.
Corrective Action
Test transformer/look for shorts
& clean or replace
electrodes/transformer.
See flame adjustment on page 3-
4 regarding air band adjustment
Clean CAD cell with cloth. If issue
still pursists see below.
Test CAD cell by slightly adjusting
position a few times. If issue
pursists, see below.
Test by using a jump wire from
terminal F1 to terminal F2 on the
primary control with the
following process. Step 1: Hook
jumper to F1. Step 2: Start unit
and wait until flame is present.
Step 3: Then immediately hook
jump wire to F2. If unit continues
to run after 1 minute, CAD cell is
defective and needs to be
repalced. WARNING: THIS IS
FOR TESTING PURPOSES ONLY.
FOR SAFETY, DO NOT
CONTINTUE TO OPERATE USING
JUMP WIRES.
Test burner. Remove burner
housing panel to access the
burner. Start the SunFire and
view the LED lights to the right of
the burner primary control. If
green light continues to blink, an
adjustment may be needed.
Adjust the top fuel pressure
screw along with very slight
adjustements to the air band
until a correct adjustment is
achieved and the green light
stays solid green.
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