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Pr
Poor MV output.
Excessive draft.
Recirculation of flue
prod ucts.
Excessive
tempera-
tu re.
Improper
pilot
flame size or char-
acteristic.
Defective thermocouple.
Weak
holding
BASO
power unit.
Insufficient MV output.
Weak or defective ther-
mocouple.
Defective thermostat.
Defective actuator.
Use Test Procedure
I.
Baffle secondary air or
shield
pilot burner.
Check venting and main
burner
orifice
sizing
and correct where nec-
essary.
Check main burner in-
put and correct if nec-
essa ry.
Check
gas
pressure,
clean pilot burner, and
adjust flame.
Test
thermocouple
under
Test Procedures I and II on
page 2.
Test under Procedure 2.
Use
Test
Procedure
lB.
(Check and correct as
in
(a) through (d) above.)
Use Test Procedure
I
and
II
on
page
2.
Replace
thermocouple
if
necessary.
Use Test Procedure Ill.
Replace
as
indicated.
Use Test Procedure Ill.
Replace
if
necessary.
CONDITION
Pilot
burner outage
or
varying performance.
Pilot burner burning, plug
valve knob turned to ON
position, thermostat call-
ing for heat. Main burner
does not come on.
Thermostat not calling for
heat,
or
turned way
down, plug valve knob in
ON position - main
burner will not shut off.
SERVICE SUGGESTIONS
POSSIBLE CAUSE
Shorted thermostat cir-
Cu it.
Foreign particles
lodged between valve
seat.
16
REMEDY
Use Test Procedure
Ill.
Remove actuator and clean
valve seat.
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